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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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-06-28T11:42:18+00:00",
      "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": {
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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. 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      "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.