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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.