CVE-2024-40905 (GCVE-0-2024-40905)

Vulnerability from cvelistv5 – Published: 2024-07-12 12:20 – Updated: 2025-11-03 21:57
VLAI?
Title
ipv6: fix possible race in __fib6_drop_pcpu_from()
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix possible race in __fib6_drop_pcpu_from() syzbot found a race in __fib6_drop_pcpu_from() [1] If compiler reads more than once (*ppcpu_rt), second read could read NULL, if another cpu clears the value in rt6_get_pcpu_route(). Add a READ_ONCE() to prevent this race. Also add rcu_read_lock()/rcu_read_unlock() because we rely on RCU protection while dereferencing pcpu_rt. [1] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000012: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000090-0x0000000000000097] CPU: 0 PID: 7543 Comm: kworker/u8:17 Not tainted 6.10.0-rc1-syzkaller-00013-g2bfcfd584ff5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Workqueue: netns cleanup_net RIP: 0010:__fib6_drop_pcpu_from.part.0+0x10a/0x370 net/ipv6/ip6_fib.c:984 Code: f8 48 c1 e8 03 80 3c 28 00 0f 85 16 02 00 00 4d 8b 3f 4d 85 ff 74 31 e8 74 a7 fa f7 49 8d bf 90 00 00 00 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 1e 02 00 00 49 8b 87 90 00 00 00 48 8b 0c 24 48 RSP: 0018:ffffc900040df070 EFLAGS: 00010206 RAX: 0000000000000012 RBX: 0000000000000001 RCX: ffffffff89932e16 RDX: ffff888049dd1e00 RSI: ffffffff89932d7c RDI: 0000000000000091 RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000007 R10: 0000000000000001 R11: 0000000000000006 R12: ffff88807fa080b8 R13: fffffbfff1a9a07d R14: ffffed100ff41022 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32c26000 CR3: 000000005d56e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __fib6_drop_pcpu_from net/ipv6/ip6_fib.c:966 [inline] fib6_drop_pcpu_from net/ipv6/ip6_fib.c:1027 [inline] fib6_purge_rt+0x7f2/0x9f0 net/ipv6/ip6_fib.c:1038 fib6_del_route net/ipv6/ip6_fib.c:1998 [inline] fib6_del+0xa70/0x17b0 net/ipv6/ip6_fib.c:2043 fib6_clean_node+0x426/0x5b0 net/ipv6/ip6_fib.c:2205 fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2127 fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2175 fib6_clean_tree+0xd7/0x120 net/ipv6/ip6_fib.c:2255 __fib6_clean_all+0x100/0x2d0 net/ipv6/ip6_fib.c:2271 rt6_sync_down_dev net/ipv6/route.c:4906 [inline] rt6_disable_ip+0x7ed/0xa00 net/ipv6/route.c:4911 addrconf_ifdown.isra.0+0x117/0x1b40 net/ipv6/addrconf.c:3855 addrconf_notify+0x223/0x19e0 net/ipv6/addrconf.c:3778 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1992 call_netdevice_notifiers_extack net/core/dev.c:2030 [inline] call_netdevice_notifiers net/core/dev.c:2044 [inline] dev_close_many+0x333/0x6a0 net/core/dev.c:1585 unregister_netdevice_many_notify+0x46d/0x19f0 net/core/dev.c:11193 unregister_netdevice_many net/core/dev.c:11276 [inline] default_device_exit_batch+0x85b/0xae0 net/core/dev.c:11759 ops_exit_list+0x128/0x180 net/core/net_namespace.c:178 cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:640 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d52d3997f843ffefaa8d8462790ffcaca6c74192 , < c90af1cced2f669a7b2304584be4ada495eaa0e5 (git)
Affected: d52d3997f843ffefaa8d8462790ffcaca6c74192 , < c693698787660c97950bc1f93a8dd19d8307153d (git)
Affected: d52d3997f843ffefaa8d8462790ffcaca6c74192 , < a0bc020592b54a8f3fa2b7f244b6e39e526c2e12 (git)
Affected: d52d3997f843ffefaa8d8462790ffcaca6c74192 , < 2498960dac9b6fc49b6d1574f7cd1a4872744adf (git)
Affected: d52d3997f843ffefaa8d8462790ffcaca6c74192 , < 7e796c3fefa8b17b30e7252886ae8cffacd2b9ef (git)
Affected: d52d3997f843ffefaa8d8462790ffcaca6c74192 , < 09e5a5a80e205922151136069e440477d6816914 (git)
Affected: d52d3997f843ffefaa8d8462790ffcaca6c74192 , < b01e1c030770ff3b4fe37fc7cc6bca03f594133f (git)
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    Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 5.4.279 , ≤ 5.4.* (semver)
Unaffected: 5.10.221 , ≤ 5.10.* (semver)
Unaffected: 5.15.162 , ≤ 5.15.* (semver)
Unaffected: 6.1.95 , ≤ 6.1.* (semver)
Unaffected: 6.6.35 , ≤ 6.6.* (semver)
Unaffected: 6.9.6 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix possible race in __fib6_drop_pcpu_from()\n\nsyzbot found a race in __fib6_drop_pcpu_from() [1]\n\nIf compiler reads more than once (*ppcpu_rt),\nsecond read could read NULL, if another cpu clears\nthe value in rt6_get_pcpu_route().\n\nAdd a READ_ONCE() to prevent this race.\n\nAlso add rcu_read_lock()/rcu_read_unlock() because\nwe rely on RCU protection while dereferencing pcpu_rt.\n\n[1]\n\nOops: general protection fault, probably for non-canonical address 0xdffffc0000000012: 0000 [#1] PREEMPT SMP KASAN PTI\nKASAN: null-ptr-deref in range [0x0000000000000090-0x0000000000000097]\nCPU: 0 PID: 7543 Comm: kworker/u8:17 Not tainted 6.10.0-rc1-syzkaller-00013-g2bfcfd584ff5 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024\nWorkqueue: netns cleanup_net\n RIP: 0010:__fib6_drop_pcpu_from.part.0+0x10a/0x370 net/ipv6/ip6_fib.c:984\nCode: f8 48 c1 e8 03 80 3c 28 00 0f 85 16 02 00 00 4d 8b 3f 4d 85 ff 74 31 e8 74 a7 fa f7 49 8d bf 90 00 00 00 48 89 f8 48 c1 e8 03 \u003c80\u003e 3c 28 00 0f 85 1e 02 00 00 49 8b 87 90 00 00 00 48 8b 0c 24 48\nRSP: 0018:ffffc900040df070 EFLAGS: 00010206\nRAX: 0000000000000012 RBX: 0000000000000001 RCX: ffffffff89932e16\nRDX: ffff888049dd1e00 RSI: ffffffff89932d7c RDI: 0000000000000091\nRBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000007\nR10: 0000000000000001 R11: 0000000000000006 R12: ffff88807fa080b8\nR13: fffffbfff1a9a07d R14: ffffed100ff41022 R15: 0000000000000001\nFS:  0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000001b32c26000 CR3: 000000005d56e000 CR4: 00000000003526f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n  __fib6_drop_pcpu_from net/ipv6/ip6_fib.c:966 [inline]\n  fib6_drop_pcpu_from net/ipv6/ip6_fib.c:1027 [inline]\n  fib6_purge_rt+0x7f2/0x9f0 net/ipv6/ip6_fib.c:1038\n  fib6_del_route net/ipv6/ip6_fib.c:1998 [inline]\n  fib6_del+0xa70/0x17b0 net/ipv6/ip6_fib.c:2043\n  fib6_clean_node+0x426/0x5b0 net/ipv6/ip6_fib.c:2205\n  fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2127\n  fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2175\n  fib6_clean_tree+0xd7/0x120 net/ipv6/ip6_fib.c:2255\n  __fib6_clean_all+0x100/0x2d0 net/ipv6/ip6_fib.c:2271\n  rt6_sync_down_dev net/ipv6/route.c:4906 [inline]\n  rt6_disable_ip+0x7ed/0xa00 net/ipv6/route.c:4911\n  addrconf_ifdown.isra.0+0x117/0x1b40 net/ipv6/addrconf.c:3855\n  addrconf_notify+0x223/0x19e0 net/ipv6/addrconf.c:3778\n  notifier_call_chain+0xb9/0x410 kernel/notifier.c:93\n  call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1992\n  call_netdevice_notifiers_extack net/core/dev.c:2030 [inline]\n  call_netdevice_notifiers net/core/dev.c:2044 [inline]\n  dev_close_many+0x333/0x6a0 net/core/dev.c:1585\n  unregister_netdevice_many_notify+0x46d/0x19f0 net/core/dev.c:11193\n  unregister_netdevice_many net/core/dev.c:11276 [inline]\n  default_device_exit_batch+0x85b/0xae0 net/core/dev.c:11759\n  ops_exit_list+0x128/0x180 net/core/net_namespace.c:178\n  cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:640\n  process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231\n  process_scheduled_works kernel/workqueue.c:3312 [inline]\n  worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393\n  kthread+0x2c1/0x3a0 kernel/kthread.c:389\n  ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244"
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    "vulnrichment": {
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6.10.0-rc1-syzkaller-00013-g2bfcfd584ff5 #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024\\nWorkqueue: netns cleanup_net\\n RIP: 0010:__fib6_drop_pcpu_from.part.0+0x10a/0x370 net/ipv6/ip6_fib.c:984\\nCode: f8 48 c1 e8 03 80 3c 28 00 0f 85 16 02 00 00 4d 8b 3f 4d 85 ff 74 31 e8 74 a7 fa f7 49 8d bf 90 00 00 00 48 89 f8 48 c1 e8 03 \u003c80\u003e 3c 28 00 0f 85 1e 02 00 00 49 8b 87 90 00 00 00 48 8b 0c 24 48\\nRSP: 0018:ffffc900040df070 EFLAGS: 00010206\\nRAX: 0000000000000012 RBX: 0000000000000001 RCX: ffffffff89932e16\\nRDX: ffff888049dd1e00 RSI: ffffffff89932d7c RDI: 0000000000000091\\nRBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000007\\nR10: 0000000000000001 R11: 0000000000000006 R12: ffff88807fa080b8\\nR13: fffffbfff1a9a07d R14: ffffed100ff41022 R15: 0000000000000001\\nFS:  0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 0000001b32c26000 CR3: 000000005d56e000 CR4: 00000000003526f0\\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\nCall Trace:\\n \u003cTASK\u003e\\n  __fib6_drop_pcpu_from net/ipv6/ip6_fib.c:966 [inline]\\n  fib6_drop_pcpu_from net/ipv6/ip6_fib.c:1027 [inline]\\n  fib6_purge_rt+0x7f2/0x9f0 net/ipv6/ip6_fib.c:1038\\n  fib6_del_route net/ipv6/ip6_fib.c:1998 [inline]\\n  fib6_del+0xa70/0x17b0 net/ipv6/ip6_fib.c:2043\\n  fib6_clean_node+0x426/0x5b0 net/ipv6/ip6_fib.c:2205\\n  fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2127\\n  fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2175\\n  fib6_clean_tree+0xd7/0x120 net/ipv6/ip6_fib.c:2255\\n  __fib6_clean_all+0x100/0x2d0 net/ipv6/ip6_fib.c:2271\\n  rt6_sync_down_dev net/ipv6/route.c:4906 [inline]\\n  rt6_disable_ip+0x7ed/0xa00 net/ipv6/route.c:4911\\n  addrconf_ifdown.isra.0+0x117/0x1b40 net/ipv6/addrconf.c:3855\\n  addrconf_notify+0x223/0x19e0 net/ipv6/addrconf.c:3778\\n  notifier_call_chain+0xb9/0x410 kernel/notifier.c:93\\n  call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1992\\n  call_netdevice_notifiers_extack net/core/dev.c:2030 [inline]\\n  call_netdevice_notifiers net/core/dev.c:2044 [inline]\\n  dev_close_many+0x333/0x6a0 net/core/dev.c:1585\\n  unregister_netdevice_many_notify+0x46d/0x19f0 net/core/dev.c:11193\\n  unregister_netdevice_many net/core/dev.c:11276 [inline]\\n  default_device_exit_batch+0x85b/0xae0 net/core/dev.c:11759\\n  ops_exit_list+0x128/0x180 net/core/net_namespace.c:178\\n  cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:640\\n  process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231\\n  process_scheduled_works kernel/workqueue.c:3312 [inline]\\n  worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393\\n  kthread+0x2c1/0x3a0 kernel/kthread.c:389\\n  ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147\\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\"}], \"affected\": [{\"product\": \"Linux\", \"vendor\": \"Linux\", \"defaultStatus\": \"unaffected\", \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"programFiles\": [\"net/ipv6/ip6_fib.c\", \"net/ipv6/route.c\"], \"versions\": [{\"version\": \"d52d3997f843\", \"lessThan\": \"c90af1cced2f\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"d52d3997f843\", \"lessThan\": \"c69369878766\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"d52d3997f843\", \"lessThan\": \"a0bc020592b5\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"d52d3997f843\", \"lessThan\": \"2498960dac9b\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"d52d3997f843\", \"lessThan\": \"7e796c3fefa8\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"d52d3997f843\", \"lessThan\": \"09e5a5a80e20\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"d52d3997f843\", \"lessThan\": \"b01e1c030770\", \"status\": \"affected\", \"versionType\": \"git\"}]}, {\"product\": \"Linux\", \"vendor\": \"Linux\", \"defaultStatus\": \"affected\", \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"programFiles\": [\"net/ipv6/ip6_fib.c\", \"net/ipv6/route.c\"], \"versions\": [{\"version\": \"4.2\", \"status\": \"affected\"}, {\"version\": \"0\", \"lessThan\": \"4.2\", \"status\": \"unaffected\", \"versionType\": \"custom\"}, {\"version\": \"5.4.279\", \"lessThanOrEqual\": \"5.4.*\", \"status\": \"unaffected\", \"versionType\": \"custom\"}, {\"version\": \"5.10.221\", \"lessThanOrEqual\": \"5.10.*\", \"status\": \"unaffected\", \"versionType\": \"custom\"}, {\"version\": \"5.15.162\", \"lessThanOrEqual\": \"5.15.*\", \"status\": \"unaffected\", \"versionType\": \"custom\"}, {\"version\": \"6.1.95\", \"lessThanOrEqual\": \"6.1.*\", \"status\": \"unaffected\", \"versionType\": \"custom\"}, {\"version\": \"6.6.35\", \"lessThanOrEqual\": \"6.6.*\", \"status\": \"unaffected\", \"versionType\": \"custom\"}, {\"version\": \"6.9.6\", \"lessThanOrEqual\": \"6.9.*\", \"status\": \"unaffected\", \"versionType\": \"custom\"}, {\"version\": \"6.10\", \"lessThanOrEqual\": \"*\", \"status\": \"unaffected\", \"versionType\": \"original_commit_for_fix\"}]}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/c90af1cced2f669a7b2304584be4ada495eaa0e5\"}, {\"url\": \"https://git.kernel.org/stable/c/c693698787660c97950bc1f93a8dd19d8307153d\"}, {\"url\": \"https://git.kernel.org/stable/c/a0bc020592b54a8f3fa2b7f244b6e39e526c2e12\"}, {\"url\": \"https://git.kernel.org/stable/c/2498960dac9b6fc49b6d1574f7cd1a4872744adf\"}, {\"url\": \"https://git.kernel.org/stable/c/7e796c3fefa8b17b30e7252886ae8cffacd2b9ef\"}, {\"url\": \"https://git.kernel.org/stable/c/09e5a5a80e205922151136069e440477d6816914\"}, {\"url\": \"https://git.kernel.org/stable/c/b01e1c030770ff3b4fe37fc7cc6bca03f594133f\"}], \"title\": \"ipv6: fix possible race in __fib6_drop_pcpu_from()\", \"x_generator\": {\"engine\": \"bippy-c9c4e1df01b2\"}}, \"adp\": [{\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-40905\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T17:06:21.867829Z\"}}}], \"providerMetadata\": {\"shortName\": \"CISA-ADP\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"dateUpdated\": \"2024-09-11T12:42:24.900Z\"}, \"title\": \"CISA ADP Vulnrichment\"}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-40905\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"Linux\", \"dateReserved\": \"2024-07-12T12:17:45.580Z\", \"datePublished\": \"2024-07-12T12:20:45.832Z\", \"dateUpdated\": \"2024-08-02T04:39:55.398Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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  • 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.