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CVE-2025-40168 (GCVE-0-2025-40168)

Vulnerability from cvelistv5 – Published: 2025-11-12 10:46 – Updated: 2026-09-02 12:49
VLAI
Title
smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match().
Summary
In the Linux kernel, the following vulnerability has been resolved: smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match(). smc_clc_prfx_match() is called from smc_listen_work() and not under RCU nor RTNL. Using sk_dst_get(sk)->dev could trigger UAF. Let's use __sk_dst_get() and dst_dev_rcu(). Note that the returned value of smc_clc_prfx_match() is not used in the caller.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 19:59 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a046d57da19f812216f393e7c535f5858f793ac3 , < 3f119c37aa293af41400cccb3d89fab8dcf774b0 (git)
Affected: a046d57da19f812216f393e7c535f5858f793ac3 , < 4f5f52a5842937f945582a93cb9daed9ea526fee (git)
Affected: a046d57da19f812216f393e7c535f5858f793ac3 , < 326e5cf301d0bec0a672aa834d8254c4f9df6255 (git)
Affected: a046d57da19f812216f393e7c535f5858f793ac3 , < d26e80f7fb62d77757b67a1b94e4ac756bc9c658 (git)
Affected: a046d57da19f812216f393e7c535f5858f793ac3 , < 235f81045c008169cc4e1955b4a64e118eebe61b (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 6.1.187 , ≤ 6.1.* (semver)
Unaffected: 6.6.156 , ≤ 6.6.* (semver)
Unaffected: 6.12.108 , ≤ 6.12.* (semver)
Unaffected: 6.17.3 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-40168\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-16T19:59:59.004592Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-16T20:00:10.346Z\"}}], \"cna\": {\"title\": \"smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match().\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 8.1, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:N - The vulnerable read is performed by the SMC listen worker while parsing a CLC Proposal message received over TCP from a remote peer (smc_listen_work \\u2192 smc_listen_find_device \\u2192 smc_listen_prfx_check \\u2192 smc_clc_prfx_match), and the peer controls the fields that select and drive the code path. Any host running an AF_SMC listener is exposed to unauthenticated remote connections.\\nAC:H - The attacker fully controls one side of the race (when the CLC Proposal arrives and thus when the stale dst-\u003edev is dereferenced), but the other side requires the route\u0027s net_device to be concurrently torn down via dst_dev_put()/free_netdev(), which a remote attacker cannot induce or time.\\nPR:N - The CLC handshake is the first exchange on the connection and SMC performs no authentication before smc_clc_prfx_match() runs, so an unauthenticated remote attacker reaches the bug with no credentials of any kind.\\nUI:N - Triggering requires only that the attacker complete a TCP handshake with the SMC option and send a CLC Proposal; no action by any local user or administrator is needed.\\nS:U - The use-after-free is confined to kernel memory (the net_device slab and the in_dev/inet6_dev structures it points at) within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\\nC:H - The freed net_device is dereferenced and its ifa_list/addr_list walked, and since a reclaimed slab can be groomed with attacker-controlled data this yields an arbitrary kernel-memory read primitive; the match/no-match outcome is additionally returned to the peer as SMC_CLC_DECL_DIFFPREFIX, forming a remotely observable oracle on freed memory contents.\\nI:H - A use-after-free of a net_device is a heap-corruption primitive: the reclaimed object\u0027s contents are attacker-influencable via heap spraying and the code follows pointers out of it, which can be groomed into an arbitrary write and control-flow hijack.\\nA:H - Dereferencing the freed net_device and walking a bogus in_dev/inet6_dev address list reliably produces a kernel oops, panic, or an unbounded list walk, crashing the system.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"a046d57da19f812216f393e7c535f5858f793ac3\", \"lessThan\": \"3f119c37aa293af41400cccb3d89fab8dcf774b0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a046d57da19f812216f393e7c535f5858f793ac3\", \"lessThan\": \"4f5f52a5842937f945582a93cb9daed9ea526fee\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a046d57da19f812216f393e7c535f5858f793ac3\", \"lessThan\": \"326e5cf301d0bec0a672aa834d8254c4f9df6255\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a046d57da19f812216f393e7c535f5858f793ac3\", \"lessThan\": \"d26e80f7fb62d77757b67a1b94e4ac756bc9c658\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a046d57da19f812216f393e7c535f5858f793ac3\", \"lessThan\": \"235f81045c008169cc4e1955b4a64e118eebe61b\", \"versionType\": \"git\"}], \"programFiles\": [\"net/smc/smc_clc.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.11\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.11\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.187\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.156\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.108\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.17.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.17.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/smc/smc_clc.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3f119c37aa293af41400cccb3d89fab8dcf774b0\"}, {\"url\": \"https://git.kernel.org/stable/c/4f5f52a5842937f945582a93cb9daed9ea526fee\"}, {\"url\": \"https://git.kernel.org/stable/c/326e5cf301d0bec0a672aa834d8254c4f9df6255\"}, {\"url\": \"https://git.kernel.org/stable/c/d26e80f7fb62d77757b67a1b94e4ac756bc9c658\"}, {\"url\": \"https://git.kernel.org/stable/c/235f81045c008169cc4e1955b4a64e118eebe61b\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsmc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match().\\n\\nsmc_clc_prfx_match() is called from smc_listen_work() and\\nnot under RCU nor RTNL.\\n\\nUsing sk_dst_get(sk)-\u003edev could trigger UAF.\\n\\nLet\u0027s use __sk_dst_get() and dst_dev_rcu().\\n\\nNote that the returned value of smc_clc_prfx_match() is not\\nused in the caller.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.187\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.156\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.108\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.17.3\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18\", \"versionStartIncluding\": \"4.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-09-02T12:49:28.040Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-40168\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-02T12:49:28.040Z\", \"dateReserved\": \"2025-04-16T07:20:57.176Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-11-12T10:46:51.422Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.