CVE-2021-46955 (GCVE-0-2021-46955)

Vulnerability from cvelistv5 – Published: 2024-02-27 18:46 – Updated: 2025-05-04 12:40
VLAI?
Title
openvswitch: fix stack OOB read while fragmenting IPv4 packets
Summary
In the Linux kernel, the following vulnerability has been resolved: openvswitch: fix stack OOB read while fragmenting IPv4 packets running openvswitch on kernels built with KASAN, it's possible to see the following splat while testing fragmentation of IPv4 packets: BUG: KASAN: stack-out-of-bounds in ip_do_fragment+0x1b03/0x1f60 Read of size 1 at addr ffff888112fc713c by task handler2/1367 CPU: 0 PID: 1367 Comm: handler2 Not tainted 5.12.0-rc6+ #418 Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014 Call Trace: dump_stack+0x92/0xc1 print_address_description.constprop.7+0x1a/0x150 kasan_report.cold.13+0x7f/0x111 ip_do_fragment+0x1b03/0x1f60 ovs_fragment+0x5bf/0x840 [openvswitch] do_execute_actions+0x1bd5/0x2400 [openvswitch] ovs_execute_actions+0xc8/0x3d0 [openvswitch] ovs_packet_cmd_execute+0xa39/0x1150 [openvswitch] genl_family_rcv_msg_doit.isra.15+0x227/0x2d0 genl_rcv_msg+0x287/0x490 netlink_rcv_skb+0x120/0x380 genl_rcv+0x24/0x40 netlink_unicast+0x439/0x630 netlink_sendmsg+0x719/0xbf0 sock_sendmsg+0xe2/0x110 ____sys_sendmsg+0x5ba/0x890 ___sys_sendmsg+0xe9/0x160 __sys_sendmsg+0xd3/0x170 do_syscall_64+0x33/0x40 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f957079db07 Code: c3 66 90 41 54 41 89 d4 55 48 89 f5 53 89 fb 48 83 ec 10 e8 eb ec ff ff 44 89 e2 48 89 ee 89 df 41 89 c0 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 48 89 44 24 08 e8 24 ed ff ff 48 RSP: 002b:00007f956ce35a50 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000019 RCX: 00007f957079db07 RDX: 0000000000000000 RSI: 00007f956ce35ae0 RDI: 0000000000000019 RBP: 00007f956ce35ae0 R08: 0000000000000000 R09: 00007f9558006730 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007f956ce37308 R14: 00007f956ce35f80 R15: 00007f956ce35ae0 The buggy address belongs to the page: page:00000000af2a1d93 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112fc7 flags: 0x17ffffc0000000() raw: 0017ffffc0000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected addr ffff888112fc713c is located in stack of task handler2/1367 at offset 180 in frame: ovs_fragment+0x0/0x840 [openvswitch] this frame has 2 objects: [32, 144) 'ovs_dst' [192, 424) 'ovs_rt' Memory state around the buggy address: ffff888112fc7000: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888112fc7080: 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 00 00 >ffff888112fc7100: 00 00 00 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 ^ ffff888112fc7180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888112fc7200: 00 00 00 00 00 00 f2 f2 f2 00 00 00 00 00 00 00 for IPv4 packets, ovs_fragment() uses a temporary struct dst_entry. Then, in the following call graph: ip_do_fragment() ip_skb_dst_mtu() ip_dst_mtu_maybe_forward() ip_mtu_locked() the pointer to struct dst_entry is used as pointer to struct rtable: this turns the access to struct members like rt_mtu_locked into an OOB read in the stack. Fix this changing the temporary variable used for IPv4 packets in ovs_fragment(), similarly to what is done for IPv6 few lines below.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 119bbaa6795a4f4aed46994cc7d9ab01989c87e3 , < b1d7280f9ba1bfdbc3af5bdb82e51f014854f26f (git)
Affected: d543907a4730400f5c5b684c57cb5bbbfd6136ab , < 23e17ec1a5eb53fe39cc34fa5592686d5acd0dac (git)
Affected: 8387fbac8e18e26a60559adc63e0b7067303b0a4 , < 5a52fa8ad45b5a593ed416adf326538638454ff1 (git)
Affected: d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 , < df9e900de24637be41879e2c50afb713ec4e8b2e (git)
Affected: d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 , < 490ad0a2390442d0a7b8c00972a83dbb09cab142 (git)
Affected: d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 , < a1478374b0bda89b4277a8afd39208271faad4be (git)
Affected: d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 , < d841d3cf5297fde4ce6a41ff35451d0e82917f3e (git)
Affected: d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 , < b3502b04e84ac5349be95fc033c17bd701d2787a (git)
Affected: d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221 , < 7c0ea5930c1c211931819d83cfb157bff1539a4c (git)
Affected: df9ece1148e2ec242871623dedb004f7a1387125 (git)
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    Linux Linux Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 4.4.269 , ≤ 4.4.* (semver)
Unaffected: 4.9.269 , ≤ 4.9.* (semver)
Unaffected: 4.14.233 , ≤ 4.14.* (semver)
Unaffected: 4.19.191 , ≤ 4.19.* (semver)
Unaffected: 5.4.118 , ≤ 5.4.* (semver)
Unaffected: 5.10.36 , ≤ 5.10.* (semver)
Unaffected: 5.11.20 , ≤ 5.11.* (semver)
Unaffected: 5.12.3 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nopenvswitch: fix stack OOB read while fragmenting IPv4 packets\n\nrunning openvswitch on kernels built with KASAN, it\u0027s possible to see the\nfollowing splat while testing fragmentation of IPv4 packets:\n\n BUG: KASAN: stack-out-of-bounds in ip_do_fragment+0x1b03/0x1f60\n Read of size 1 at addr ffff888112fc713c by task handler2/1367\n\n CPU: 0 PID: 1367 Comm: handler2 Not tainted 5.12.0-rc6+ #418\n Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014\n Call Trace:\n  dump_stack+0x92/0xc1\n  print_address_description.constprop.7+0x1a/0x150\n  kasan_report.cold.13+0x7f/0x111\n  ip_do_fragment+0x1b03/0x1f60\n  ovs_fragment+0x5bf/0x840 [openvswitch]\n  do_execute_actions+0x1bd5/0x2400 [openvswitch]\n  ovs_execute_actions+0xc8/0x3d0 [openvswitch]\n  ovs_packet_cmd_execute+0xa39/0x1150 [openvswitch]\n  genl_family_rcv_msg_doit.isra.15+0x227/0x2d0\n  genl_rcv_msg+0x287/0x490\n  netlink_rcv_skb+0x120/0x380\n  genl_rcv+0x24/0x40\n  netlink_unicast+0x439/0x630\n  netlink_sendmsg+0x719/0xbf0\n  sock_sendmsg+0xe2/0x110\n  ____sys_sendmsg+0x5ba/0x890\n  ___sys_sendmsg+0xe9/0x160\n  __sys_sendmsg+0xd3/0x170\n  do_syscall_64+0x33/0x40\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7f957079db07\n Code: c3 66 90 41 54 41 89 d4 55 48 89 f5 53 89 fb 48 83 ec 10 e8 eb ec ff ff 44 89 e2 48 89 ee 89 df 41 89 c0 b8 2e 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 35 44 89 c7 48 89 44 24 08 e8 24 ed ff ff 48\n RSP: 002b:00007f956ce35a50 EFLAGS: 00000293 ORIG_RAX: 000000000000002e\n RAX: ffffffffffffffda RBX: 0000000000000019 RCX: 00007f957079db07\n RDX: 0000000000000000 RSI: 00007f956ce35ae0 RDI: 0000000000000019\n RBP: 00007f956ce35ae0 R08: 0000000000000000 R09: 00007f9558006730\n R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000\n R13: 00007f956ce37308 R14: 00007f956ce35f80 R15: 00007f956ce35ae0\n\n The buggy address belongs to the page:\n page:00000000af2a1d93 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112fc7\n flags: 0x17ffffc0000000()\n raw: 0017ffffc0000000 0000000000000000 dead000000000122 0000000000000000\n raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n page dumped because: kasan: bad access detected\n\n addr ffff888112fc713c is located in stack of task handler2/1367 at offset 180 in frame:\n  ovs_fragment+0x0/0x840 [openvswitch]\n\n this frame has 2 objects:\n  [32, 144) \u0027ovs_dst\u0027\n  [192, 424) \u0027ovs_rt\u0027\n\n Memory state around the buggy address:\n  ffff888112fc7000: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n  ffff888112fc7080: 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 00 00\n \u003effff888112fc7100: 00 00 00 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00\n                                         ^\n  ffff888112fc7180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n  ffff888112fc7200: 00 00 00 00 00 00 f2 f2 f2 00 00 00 00 00 00 00\n\nfor IPv4 packets, ovs_fragment() uses a temporary struct dst_entry. Then,\nin the following call graph:\n\n  ip_do_fragment()\n    ip_skb_dst_mtu()\n      ip_dst_mtu_maybe_forward()\n        ip_mtu_locked()\n\nthe pointer to struct dst_entry is used as pointer to struct rtable: this\nturns the access to struct members like rt_mtu_locked into an OOB read in\nthe stack. Fix this changing the temporary variable used for IPv4 packets\nin ovs_fragment(), similarly to what is done for IPv6 few lines below."
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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b1d7280f9ba1bfdbc3af5bdb82e51f014854f26f\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/23e17ec1a5eb53fe39cc34fa5592686d5acd0dac\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/5a52fa8ad45b5a593ed416adf326538638454ff1\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/df9e900de24637be41879e2c50afb713ec4e8b2e\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/490ad0a2390442d0a7b8c00972a83dbb09cab142\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/a1478374b0bda89b4277a8afd39208271faad4be\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/d841d3cf5297fde4ce6a41ff35451d0e82917f3e\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/b3502b04e84ac5349be95fc033c17bd701d2787a\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/7c0ea5930c1c211931819d83cfb157bff1539a4c\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:17:42.889Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-46955\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-28T17:01:12.713223Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-28T17:01:21.743Z\"}}], \"cna\": {\"title\": \"openvswitch: fix stack OOB read while fragmenting IPv4 packets\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"119bbaa6795a4f4aed46994cc7d9ab01989c87e3\", \"lessThan\": \"b1d7280f9ba1bfdbc3af5bdb82e51f014854f26f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d543907a4730400f5c5b684c57cb5bbbfd6136ab\", \"lessThan\": \"23e17ec1a5eb53fe39cc34fa5592686d5acd0dac\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8387fbac8e18e26a60559adc63e0b7067303b0a4\", \"lessThan\": \"5a52fa8ad45b5a593ed416adf326538638454ff1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221\", \"lessThan\": \"df9e900de24637be41879e2c50afb713ec4e8b2e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221\", \"lessThan\": \"490ad0a2390442d0a7b8c00972a83dbb09cab142\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221\", \"lessThan\": \"a1478374b0bda89b4277a8afd39208271faad4be\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221\", \"lessThan\": \"d841d3cf5297fde4ce6a41ff35451d0e82917f3e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221\", \"lessThan\": \"b3502b04e84ac5349be95fc033c17bd701d2787a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d52e5a7e7ca49457dd31fc8b42fb7c0d58a31221\", \"lessThan\": \"7c0ea5930c1c211931819d83cfb157bff1539a4c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"df9ece1148e2ec242871623dedb004f7a1387125\", \"versionType\": \"git\"}], \"programFiles\": [\"net/openvswitch/actions.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.16\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.16\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.4.269\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.4.*\"}, {\"status\": \"unaffected\", \"version\": \"4.9.269\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.233\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.191\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.118\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.36\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.20\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/openvswitch/actions.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b1d7280f9ba1bfdbc3af5bdb82e51f014854f26f\"}, {\"url\": \"https://git.kernel.org/stable/c/23e17ec1a5eb53fe39cc34fa5592686d5acd0dac\"}, {\"url\": \"https://git.kernel.org/stable/c/5a52fa8ad45b5a593ed416adf326538638454ff1\"}, {\"url\": \"https://git.kernel.org/stable/c/df9e900de24637be41879e2c50afb713ec4e8b2e\"}, {\"url\": \"https://git.kernel.org/stable/c/490ad0a2390442d0a7b8c00972a83dbb09cab142\"}, {\"url\": \"https://git.kernel.org/stable/c/a1478374b0bda89b4277a8afd39208271faad4be\"}, {\"url\": \"https://git.kernel.org/stable/c/d841d3cf5297fde4ce6a41ff35451d0e82917f3e\"}, {\"url\": \"https://git.kernel.org/stable/c/b3502b04e84ac5349be95fc033c17bd701d2787a\"}, {\"url\": \"https://git.kernel.org/stable/c/7c0ea5930c1c211931819d83cfb157bff1539a4c\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nopenvswitch: fix stack OOB read while fragmenting IPv4 packets\\n\\nrunning openvswitch on kernels built with KASAN, it\u0027s possible to see the\\nfollowing splat while testing fragmentation of IPv4 packets:\\n\\n BUG: KASAN: stack-out-of-bounds in ip_do_fragment+0x1b03/0x1f60\\n Read of size 1 at addr ffff888112fc713c by task handler2/1367\\n\\n CPU: 0 PID: 1367 Comm: handler2 Not tainted 5.12.0-rc6+ #418\\n Hardware name: Red Hat KVM, BIOS 1.11.1-4.module+el8.1.0+4066+0f1aadab 04/01/2014\\n Call Trace:\\n  dump_stack+0x92/0xc1\\n  print_address_description.constprop.7+0x1a/0x150\\n  kasan_report.cold.13+0x7f/0x111\\n  ip_do_fragment+0x1b03/0x1f60\\n  ovs_fragment+0x5bf/0x840 [openvswitch]\\n  do_execute_actions+0x1bd5/0x2400 [openvswitch]\\n  ovs_execute_actions+0xc8/0x3d0 [openvswitch]\\n  ovs_packet_cmd_execute+0xa39/0x1150 [openvswitch]\\n  genl_family_rcv_msg_doit.isra.15+0x227/0x2d0\\n  genl_rcv_msg+0x287/0x490\\n  netlink_rcv_skb+0x120/0x380\\n  genl_rcv+0x24/0x40\\n  netlink_unicast+0x439/0x630\\n  netlink_sendmsg+0x719/0xbf0\\n  sock_sendmsg+0xe2/0x110\\n  ____sys_sendmsg+0x5ba/0x890\\n  ___sys_sendmsg+0xe9/0x160\\n  __sys_sendmsg+0xd3/0x170\\n  do_syscall_64+0x33/0x40\\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\\n RIP: 0033:0x7f957079db07\\n Code: c3 66 90 41 54 41 89 d4 55 48 89 f5 53 89 fb 48 83 ec 10 e8 eb ec ff ff 44 89 e2 48 89 ee 89 df 41 89 c0 b8 2e 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 35 44 89 c7 48 89 44 24 08 e8 24 ed ff ff 48\\n RSP: 002b:00007f956ce35a50 EFLAGS: 00000293 ORIG_RAX: 000000000000002e\\n RAX: ffffffffffffffda RBX: 0000000000000019 RCX: 00007f957079db07\\n RDX: 0000000000000000 RSI: 00007f956ce35ae0 RDI: 0000000000000019\\n RBP: 00007f956ce35ae0 R08: 0000000000000000 R09: 00007f9558006730\\n R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000\\n R13: 00007f956ce37308 R14: 00007f956ce35f80 R15: 00007f956ce35ae0\\n\\n The buggy address belongs to the page:\\n page:00000000af2a1d93 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112fc7\\n flags: 0x17ffffc0000000()\\n raw: 0017ffffc0000000 0000000000000000 dead000000000122 0000000000000000\\n raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\\n page dumped because: kasan: bad access detected\\n\\n addr ffff888112fc713c is located in stack of task handler2/1367 at offset 180 in frame:\\n  ovs_fragment+0x0/0x840 [openvswitch]\\n\\n this frame has 2 objects:\\n  [32, 144) \u0027ovs_dst\u0027\\n  [192, 424) \u0027ovs_rt\u0027\\n\\n Memory state around the buggy address:\\n  ffff888112fc7000: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n  ffff888112fc7080: 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 00 00\\n \u003effff888112fc7100: 00 00 00 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00\\n                                         ^\\n  ffff888112fc7180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n  ffff888112fc7200: 00 00 00 00 00 00 f2 f2 f2 00 00 00 00 00 00 00\\n\\nfor IPv4 packets, ovs_fragment() uses a temporary struct dst_entry. Then,\\nin the following call graph:\\n\\n  ip_do_fragment()\\n    ip_skb_dst_mtu()\\n      ip_dst_mtu_maybe_forward()\\n        ip_mtu_locked()\\n\\nthe pointer to struct dst_entry is used as pointer to struct rtable: this\\nturns the access to struct members like rt_mtu_locked into an OOB read in\\nthe stack. Fix this changing the temporary variable used for IPv4 packets\\nin ovs_fragment(), similarly to what is done for IPv6 few lines below.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.269\", \"versionStartIncluding\": \"4.4.134\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.269\", \"versionStartIncluding\": \"4.9.104\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.233\", \"versionStartIncluding\": \"4.14.45\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.191\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.118\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.36\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.20\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.3\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.16.57\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T12:40:36.828Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-46955\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T12:40:36.828Z\", \"dateReserved\": \"2024-02-27T18:42:55.937Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-27T18:46:57.428Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.