CVE-2021-47418 (GCVE-0-2021-47418)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:04 – Updated: 2025-05-04 07:10
VLAI?
Title
net_sched: fix NULL deref in fifo_set_limit()
Summary
In the Linux kernel, the following vulnerability has been resolved: net_sched: fix NULL deref in fifo_set_limit() syzbot reported another NULL deref in fifo_set_limit() [1] I could repro the issue with : unshare -n tc qd add dev lo root handle 1:0 tbf limit 200000 burst 70000 rate 100Mbit tc qd replace dev lo parent 1:0 pfifo_fast tc qd change dev lo root handle 1:0 tbf limit 300000 burst 70000 rate 100Mbit pfifo_fast does not have a change() operation. Make fifo_set_limit() more robust about this. [1] BUG: kernel NULL pointer dereference, address: 0000000000000000 PGD 1cf99067 P4D 1cf99067 PUD 7ca49067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 14443 Comm: syz-executor959 Not tainted 5.15.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:0x0 Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. RSP: 0018:ffffc9000e2f7310 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffffffff8d6ecc00 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff888024c27910 RDI: ffff888071e34000 RBP: ffff888071e34000 R08: 0000000000000001 R09: ffffffff8fcfb947 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888024c27910 R13: ffff888071e34018 R14: 0000000000000000 R15: ffff88801ef74800 FS: 00007f321d897700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000000722c3000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: fifo_set_limit net/sched/sch_fifo.c:242 [inline] fifo_set_limit+0x198/0x210 net/sched/sch_fifo.c:227 tbf_change+0x6ec/0x16d0 net/sched/sch_tbf.c:418 qdisc_change net/sched/sch_api.c:1332 [inline] tc_modify_qdisc+0xd9a/0x1a60 net/sched/sch_api.c:1634 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: fb0305ce1b03f6ff17f84f2c63daccecb45f2805 , < 0dd7ddc462b9c2d31eb5a9926a2cc63eaa3e9f52 (git)
Affected: fb0305ce1b03f6ff17f84f2c63daccecb45f2805 , < 08d7056e8e250fd2e67dbea5be5fdecdd75bf6b4 (git)
Affected: fb0305ce1b03f6ff17f84f2c63daccecb45f2805 , < 26af64d71b6277841285fa40e3f7164a378dfda9 (git)
Affected: fb0305ce1b03f6ff17f84f2c63daccecb45f2805 , < d07098f45be868a9cdce6c616563c36c64dbbd87 (git)
Affected: fb0305ce1b03f6ff17f84f2c63daccecb45f2805 , < c951a3be5e8803e93bb49a0aca0d30457d3c1b67 (git)
Affected: fb0305ce1b03f6ff17f84f2c63daccecb45f2805 , < acff2d182c0768a713cee77442caeb07668bd68f (git)
Affected: fb0305ce1b03f6ff17f84f2c63daccecb45f2805 , < fb58cd7991747b5e0b110c98c922d7b0e47a1f14 (git)
Affected: fb0305ce1b03f6ff17f84f2c63daccecb45f2805 , < 560ee196fe9e5037e5015e2cdb14b3aecb1cd7dc (git)
Create a notification for this product.
    Linux Linux Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 4.4.289 , ≤ 4.4.* (semver)
Unaffected: 4.9.287 , ≤ 4.9.* (semver)
Unaffected: 4.14.251 , ≤ 4.14.* (semver)
Unaffected: 4.19.211 , ≤ 4.19.* (semver)
Unaffected: 5.4.153 , ≤ 5.4.* (semver)
Unaffected: 5.10.73 , ≤ 5.10.* (semver)
Unaffected: 5.14.12 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
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\"acff2d182c0768a713cee77442caeb07668bd68f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fb0305ce1b03f6ff17f84f2c63daccecb45f2805\", \"lessThan\": \"fb58cd7991747b5e0b110c98c922d7b0e47a1f14\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fb0305ce1b03f6ff17f84f2c63daccecb45f2805\", \"lessThan\": \"560ee196fe9e5037e5015e2cdb14b3aecb1cd7dc\", \"versionType\": \"git\"}], \"programFiles\": [\"net/sched/sch_fifo.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.27\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.27\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.4.289\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.4.*\"}, {\"status\": \"unaffected\", \"version\": \"4.9.287\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.251\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.211\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.153\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.73\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.14.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/sched/sch_fifo.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/0dd7ddc462b9c2d31eb5a9926a2cc63eaa3e9f52\"}, {\"url\": \"https://git.kernel.org/stable/c/08d7056e8e250fd2e67dbea5be5fdecdd75bf6b4\"}, {\"url\": \"https://git.kernel.org/stable/c/26af64d71b6277841285fa40e3f7164a378dfda9\"}, {\"url\": \"https://git.kernel.org/stable/c/d07098f45be868a9cdce6c616563c36c64dbbd87\"}, {\"url\": \"https://git.kernel.org/stable/c/c951a3be5e8803e93bb49a0aca0d30457d3c1b67\"}, {\"url\": \"https://git.kernel.org/stable/c/acff2d182c0768a713cee77442caeb07668bd68f\"}, {\"url\": \"https://git.kernel.org/stable/c/fb58cd7991747b5e0b110c98c922d7b0e47a1f14\"}, {\"url\": \"https://git.kernel.org/stable/c/560ee196fe9e5037e5015e2cdb14b3aecb1cd7dc\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet_sched: fix NULL deref in fifo_set_limit()\\n\\nsyzbot reported another NULL deref in fifo_set_limit() [1]\\n\\nI could repro the issue with :\\n\\nunshare -n\\ntc qd add dev lo root handle 1:0 tbf limit 200000 burst 70000 rate 100Mbit\\ntc qd replace dev lo parent 1:0 pfifo_fast\\ntc qd change dev lo root handle 1:0 tbf limit 300000 burst 70000 rate 100Mbit\\n\\npfifo_fast does not have a change() operation.\\nMake fifo_set_limit() more robust about this.\\n\\n[1]\\nBUG: kernel NULL pointer dereference, address: 0000000000000000\\nPGD 1cf99067 P4D 1cf99067 PUD 7ca49067 PMD 0\\nOops: 0010 [#1] PREEMPT SMP KASAN\\nCPU: 1 PID: 14443 Comm: syz-executor959 Not tainted 5.15.0-rc3-syzkaller #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\\nRIP: 0010:0x0\\nCode: Unable to access opcode bytes at RIP 0xffffffffffffffd6.\\nRSP: 0018:ffffc9000e2f7310 EFLAGS: 00010246\\nRAX: dffffc0000000000 RBX: ffffffff8d6ecc00 RCX: 0000000000000000\\nRDX: 0000000000000000 RSI: ffff888024c27910 RDI: ffff888071e34000\\nRBP: ffff888071e34000 R08: 0000000000000001 R09: ffffffff8fcfb947\\nR10: 0000000000000001 R11: 0000000000000000 R12: ffff888024c27910\\nR13: ffff888071e34018 R14: 0000000000000000 R15: ffff88801ef74800\\nFS:  00007f321d897700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: ffffffffffffffd6 CR3: 00000000722c3000 CR4: 00000000003506e0\\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\nCall Trace:\\n fifo_set_limit net/sched/sch_fifo.c:242 [inline]\\n fifo_set_limit+0x198/0x210 net/sched/sch_fifo.c:227\\n tbf_change+0x6ec/0x16d0 net/sched/sch_tbf.c:418\\n qdisc_change net/sched/sch_api.c:1332 [inline]\\n tc_modify_qdisc+0xd9a/0x1a60 net/sched/sch_api.c:1634\\n rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572\\n netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504\\n netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]\\n netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340\\n netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929\\n sock_sendmsg_nosec net/socket.c:704 [inline]\\n sock_sendmsg+0xcf/0x120 net/socket.c:724\\n ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409\\n ___sys_sendmsg+0xf3/0x170 net/socket.c:2463\\n __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492\\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\\n entry_SYSCALL_64_after_hwframe+0x44/0xae\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.289\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.287\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.251\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.211\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.153\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.73\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.12\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\", \"versionStartIncluding\": \"2.6.27\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:10:30.321Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47418\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:10:30.321Z\", \"dateReserved\": \"2024-05-21T14:58:30.818Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T15:04:07.333Z\", \"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.