CVE-2026-31504 (GCVE-0-2026-31504)
Vulnerability from cvelistv5
Published
2026-04-22 13:54
Modified
2026-10-19 18:45
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: fix fanout UAF in packet_release() via NETDEV_UP race `packet_release()` has a race window where `NETDEV_UP` can re-register a socket into a fanout group's `arr[]` array. The re-registration is not cleaned up by `fanout_release()`, leaving a dangling pointer in the fanout array. `packet_release()` does NOT zero `po->num` in its `bind_lock` section. After releasing `bind_lock`, `po->num` is still non-zero and `po->ifindex` still matches the bound device. A concurrent `packet_notifier(NETDEV_UP)` that already found the socket in `sklist` can re-register the hook. For fanout sockets, this re-registration calls `__fanout_link(sk, po)` which adds the socket back into `f->arr[]` and increments `f->num_members`, but does NOT increment `f->sk_ref`. The fix sets `po->num` to zero in `packet_release` while `bind_lock` is held to prevent NETDEV_UP from linking, preventing the race window. This bug was found following an additional audit with Claude Code based on CVE-2025-38617.
References
Impacted products
Vendor Product Version
Linux Linux Version: ce06b03e60fc19c680d1bf873e779bf11c2fc518
Version: ce06b03e60fc19c680d1bf873e779bf11c2fc518
Version: ce06b03e60fc19c680d1bf873e779bf11c2fc518
Version: ce06b03e60fc19c680d1bf873e779bf11c2fc518
Version: ce06b03e60fc19c680d1bf873e779bf11c2fc518
Version: ce06b03e60fc19c680d1bf873e779bf11c2fc518
Version: ce06b03e60fc19c680d1bf873e779bf11c2fc518
Version: ce06b03e60fc19c680d1bf873e779bf11c2fc518
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\"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"x_adpType\": \"supplier\", \"references\": [{\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-082556.html\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-019113.html\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-457936.html\"}], \"providerMetadata\": {\"orgId\": \"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\", \"shortName\": \"siemens-SADP\", \"dateUpdated\": \"2026-10-15T01:16:44.005Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-31504\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T15:10:18.282904Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-362\", \"description\": \"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T15:10:18.855Z\"}}], \"cna\": {\"title\": \"net: fix fanout UAF in packet_release() via NETDEV_UP race\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The vulnerable path is reached through local AF_PACKET socket setup, setsockopt(PACKET_FANOUT), close(), and local NETDEV_UP triggering, not by unauthenticated remote packets alone.\\nAC:L - The attacker controls both sides of the race by closing/releasing AF_PACKET fanout sockets while concurrently toggling a controlled netdevice up, and can repeat the race with chosen fanout modes.\\nPR:L - AF_PACKET creation requires CAP_NET_RAW and NETDEV_UP requires CAP_NET_ADMIN in the target network namespace; both are obtainable by an unprivileged user in a user/network namespace on affected systems.\\nUI:N - No victim action is required once the local attacker can run code and issue the relevant syscalls.\\nS:U - The bug corrupts kernel networking state and enables kernel compromise within the same kernel security authority; it is not a VM or hardware boundary escape.\\nC:H - This is a kernel heap use-after-free involving stale packet fanout/socket pointers reachable from packet receive dispatch, and such UAFs can be shaped into kernel memory disclosure primitives.\\nI:H - The dangling fanout entry can drive execution through freed or reclaimed packet socket state, making kernel memory corruption and control-flow or privilege-escalation primitives defensible.\\nA:H - Even without full exploitation, the stale fanout/socket pointer can be dereferenced on packet delivery and cause a kernel oops, panic, or persistent crash.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ce06b03e60fc19c680d1bf873e779bf11c2fc518\", \"lessThan\": \"ee642b1962caa9aa231c01abbd58bc453ae6b66e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ce06b03e60fc19c680d1bf873e779bf11c2fc518\", \"lessThan\": \"42cfd7898eeed290c9fb73f732af1f7d6b0a703e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ce06b03e60fc19c680d1bf873e779bf11c2fc518\", \"lessThan\": \"1b4c03f8892d955385c202009af7485364731bb9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ce06b03e60fc19c680d1bf873e779bf11c2fc518\", \"lessThan\": \"654386baef228c2992dbf604c819e4c7c35fc71b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ce06b03e60fc19c680d1bf873e779bf11c2fc518\", \"lessThan\": \"75fe6db23705a1d55160081f7b37db9665b1880b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ce06b03e60fc19c680d1bf873e779bf11c2fc518\", \"lessThan\": \"d0c7cdc15fdf8c4f91aca1928e52295d175b6ec6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ce06b03e60fc19c680d1bf873e779bf11c2fc518\", \"lessThan\": \"ceccbfc6de720ad633519a226715989cfb065af1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ce06b03e60fc19c680d1bf873e779bf11c2fc518\", \"lessThan\": \"42156f93d123436f2a27c468f18c966b7e5db796\", \"versionType\": \"git\"}], \"programFiles\": [\"net/packet/af_packet.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.1\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.1\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.253\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.203\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.131\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.80\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.21\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/packet/af_packet.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/ee642b1962caa9aa231c01abbd58bc453ae6b66e\"}, {\"url\": \"https://git.kernel.org/stable/c/42cfd7898eeed290c9fb73f732af1f7d6b0a703e\"}, {\"url\": \"https://git.kernel.org/stable/c/1b4c03f8892d955385c202009af7485364731bb9\"}, {\"url\": \"https://git.kernel.org/stable/c/654386baef228c2992dbf604c819e4c7c35fc71b\"}, {\"url\": \"https://git.kernel.org/stable/c/75fe6db23705a1d55160081f7b37db9665b1880b\"}, {\"url\": \"https://git.kernel.org/stable/c/d0c7cdc15fdf8c4f91aca1928e52295d175b6ec6\"}, {\"url\": \"https://git.kernel.org/stable/c/ceccbfc6de720ad633519a226715989cfb065af1\"}, {\"url\": \"https://git.kernel.org/stable/c/42156f93d123436f2a27c468f18c966b7e5db796\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: fix fanout UAF in packet_release() via NETDEV_UP race\\n\\n`packet_release()` has a race window where `NETDEV_UP` can re-register a\\nsocket into a fanout group\u0027s `arr[]` array. The re-registration is not\\ncleaned up by `fanout_release()`, leaving a dangling pointer in the fanout\\narray.\\n`packet_release()` does NOT zero `po-\u003enum` in its `bind_lock` section.\\nAfter releasing `bind_lock`, `po-\u003enum` is still non-zero and `po-\u003eifindex`\\nstill matches the bound device. A concurrent `packet_notifier(NETDEV_UP)`\\nthat already found the socket in `sklist` can re-register the hook.\\nFor fanout sockets, this re-registration calls `__fanout_link(sk, po)`\\nwhich adds the socket back into `f-\u003earr[]` and increments `f-\u003enum_members`,\\nbut does NOT increment `f-\u003esk_ref`.\\n\\nThe fix sets `po-\u003enum` to zero in `packet_release` while `bind_lock` is\\nheld to prevent NETDEV_UP from linking, preventing the race window.\\n\\nThis bug was found following an additional audit with Claude Code based\\non CVE-2025-38617.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.253\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.203\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.168\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.131\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.80\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.21\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.11\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"3.1\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:23:07.003Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-31504\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T18:45:53.946Z\", \"dateReserved\": \"2026-03-09T15:48:24.105Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-04-22T13:54:23.862Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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