CVE-2025-40248 (GCVE-0-2025-40248)

Vulnerability from cvelistv5 – Published: 2025-12-04 16:08 – Updated: 2026-06-16 20:01
VLAI
Title
vsock: Ignore signal/timeout on connect() if already established
Summary
In the Linux kernel, the following vulnerability has been resolved: vsock: Ignore signal/timeout on connect() if already established During connect(), acting on a signal/timeout by disconnecting an already established socket leads to several issues: 1. connect() invoking vsock_transport_cancel_pkt() -> virtio_transport_purge_skbs() may race with sendmsg() invoking virtio_transport_get_credit(). This results in a permanently elevated `vvs->bytes_unsent`. Which, in turn, confuses the SOCK_LINGER handling. 2. connect() resetting a connected socket's state may race with socket being placed in a sockmap. A disconnected socket remaining in a sockmap breaks sockmap's assumptions. And gives rise to WARNs. 3. connect() transitioning SS_CONNECTED -> SS_UNCONNECTED allows for a transport change/drop after TCP_ESTABLISHED. Which poses a problem for any simultaneous sendmsg() or connect() and may result in a use-after-free/null-ptr-deref. Do not disconnect socket on signal/timeout. Keep the logic for unconnected sockets: they don't linger, can't be placed in a sockmap, are rejected by sendmsg(). [1]: https://lore.kernel.org/netdev/e07fd95c-9a38-4eea-9638-133e38c2ec9b@rbox.co/ [2]: https://lore.kernel.org/netdev/20250317-vsock-trans-signal-race-v4-0-fc8837f3f1d4@rbox.co/ [3]: https://lore.kernel.org/netdev/60f1b7db-3099-4f6a-875e-af9f6ef194f6@rbox.co/
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 3f71753935d648082a8279a97d30efe6b85be680 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < da664101fb4a0de5cb70d2bae6a650df954df2af (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 67432915145848658149683101104e32f9fd6559 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < eeca93f06df89be5a36305b7b9dae1ed65550dfc (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 5998da5a8208ae9ad7838ba322bccb2bdcd95e81 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < f1c170cae285e4b8f61be043bb17addc3d0a14b5 (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < ab6b19f690d89ae4709fba73a3c4a7911f495b7a (git)
Affected: d021c344051af91f42c5ba9fdedc176740cbd238 , < 002541ef650b742a198e4be363881439bb9d86b4 (git)
Create a notification for this product.
Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 5.4.302 , ≤ 5.4.* (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.118 , ≤ 6.6.* (semver)
Unaffected: 6.12.60 , ≤ 6.12.* (semver)
Unaffected: 6.17.10 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Siemens RUGGEDCOM RST2428P Affected: 0 , < V4.0 (custom)
Create a notification for this product.
Show details on NVD website
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      "cve": "CVE-2025-40248",
      "id": "CVE-2025-40248",
      "initial_release_date": "2025-12-04T00:00:00+00:00",
      "product_status:fixed": "2654",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: vsock vulnerability may lead to memory corruption",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40248.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"affected\": [{\"vendor\": \"Siemens\", \"product\": \"RUGGEDCOM RST2428P\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"V4.0\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"x_adpType\": \"supplier\", \"references\": [{\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-253495.html\"}], \"providerMetadata\": {\"orgId\": \"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\", \"shortName\": \"siemens-SADP\", \"dateUpdated\": \"2026-06-02T12:59:57.735Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-40248\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-16T20:01:10.557430Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-16T20:01:14.928Z\"}}], \"cna\": {\"title\": \"vsock: Ignore signal/timeout on connect() if already established\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"d021c344051af91f42c5ba9fdedc176740cbd238\", \"lessThan\": \"3f71753935d648082a8279a97d30efe6b85be680\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d021c344051af91f42c5ba9fdedc176740cbd238\", \"lessThan\": \"da664101fb4a0de5cb70d2bae6a650df954df2af\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d021c344051af91f42c5ba9fdedc176740cbd238\", \"lessThan\": \"67432915145848658149683101104e32f9fd6559\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d021c344051af91f42c5ba9fdedc176740cbd238\", \"lessThan\": \"eeca93f06df89be5a36305b7b9dae1ed65550dfc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d021c344051af91f42c5ba9fdedc176740cbd238\", \"lessThan\": \"5998da5a8208ae9ad7838ba322bccb2bdcd95e81\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d021c344051af91f42c5ba9fdedc176740cbd238\", \"lessThan\": \"f1c170cae285e4b8f61be043bb17addc3d0a14b5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d021c344051af91f42c5ba9fdedc176740cbd238\", \"lessThan\": \"ab6b19f690d89ae4709fba73a3c4a7911f495b7a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d021c344051af91f42c5ba9fdedc176740cbd238\", \"lessThan\": \"002541ef650b742a198e4be363881439bb9d86b4\", \"versionType\": \"git\"}], \"programFiles\": [\"net/vmw_vsock/af_vsock.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.9\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.9\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.302\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.247\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.197\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.159\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.118\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.60\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.17.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.17.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/vmw_vsock/af_vsock.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3f71753935d648082a8279a97d30efe6b85be680\"}, {\"url\": \"https://git.kernel.org/stable/c/da664101fb4a0de5cb70d2bae6a650df954df2af\"}, {\"url\": \"https://git.kernel.org/stable/c/67432915145848658149683101104e32f9fd6559\"}, {\"url\": \"https://git.kernel.org/stable/c/eeca93f06df89be5a36305b7b9dae1ed65550dfc\"}, {\"url\": \"https://git.kernel.org/stable/c/5998da5a8208ae9ad7838ba322bccb2bdcd95e81\"}, {\"url\": \"https://git.kernel.org/stable/c/f1c170cae285e4b8f61be043bb17addc3d0a14b5\"}, {\"url\": \"https://git.kernel.org/stable/c/ab6b19f690d89ae4709fba73a3c4a7911f495b7a\"}, {\"url\": \"https://git.kernel.org/stable/c/002541ef650b742a198e4be363881439bb9d86b4\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvsock: Ignore signal/timeout on connect() if already established\\n\\nDuring connect(), acting on a signal/timeout by disconnecting an already\\nestablished socket leads to several issues:\\n\\n1. connect() invoking vsock_transport_cancel_pkt() -\u003e\\n   virtio_transport_purge_skbs() may race with sendmsg() invoking\\n   virtio_transport_get_credit(). This results in a permanently elevated\\n   `vvs-\u003ebytes_unsent`. Which, in turn, confuses the SOCK_LINGER handling.\\n\\n2. connect() resetting a connected socket\u0027s state may race with socket\\n   being placed in a sockmap. A disconnected socket remaining in a sockmap\\n   breaks sockmap\u0027s assumptions. And gives rise to WARNs.\\n\\n3. connect() transitioning SS_CONNECTED -\u003e SS_UNCONNECTED allows for a\\n   transport change/drop after TCP_ESTABLISHED. Which poses a problem for\\n   any simultaneous sendmsg() or connect() and may result in a\\n   use-after-free/null-ptr-deref.\\n\\nDo not disconnect socket on signal/timeout. Keep the logic for unconnected\\nsockets: they don\u0027t linger, can\u0027t be placed in a sockmap, are rejected by\\nsendmsg().\\n\\n[1]: https://lore.kernel.org/netdev/e07fd95c-9a38-4eea-9638-133e38c2ec9b@rbox.co/\\n[2]: https://lore.kernel.org/netdev/20250317-vsock-trans-signal-race-v4-0-fc8837f3f1d4@rbox.co/\\n[3]: https://lore.kernel.org/netdev/60f1b7db-3099-4f6a-875e-af9f6ef194f6@rbox.co/\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.302\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.247\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.197\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.159\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.118\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.60\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.17.10\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18\", \"versionStartIncluding\": \"3.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:45:39.557Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-40248\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-16T20:01:18.965Z\", \"dateReserved\": \"2025-04-16T07:20:57.181Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-12-04T16:08:11.509Z\", \"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.