FKIE_CVE-2025-40248

Vulnerability from fkie_nvd - Published: 2025-12-04 16:16 - Updated: 2026-10-19 19:10
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: 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/
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/002541ef650b742a198e4be363881439bb9d86b4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3f71753935d648082a8279a97d30efe6b85be680
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5998da5a8208ae9ad7838ba322bccb2bdcd95e81
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/67432915145848658149683101104e32f9fd6559
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ab6b19f690d89ae4709fba73a3c4a7911f495b7a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da664101fb4a0de5cb70d2bae6a650df954df2af
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eeca93f06df89be5a36305b7b9dae1ed65550dfc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f1c170cae285e4b8f61be043bb17addc3d0a14b5
0b142b55-0307-4c5a-b3c9-f314f3fb7c5ehttps://cert-portal.siemens.com/productcert/html/ssa-253495.html
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/vmw_vsock/af_vsock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3f71753935d648082a8279a97d30efe6b85be680",
              "status": "affected",
              "version": "d021c344051af91f42c5ba9fdedc176740cbd238",
              "versionType": "git"
            },
            {
              "lessThan": "da664101fb4a0de5cb70d2bae6a650df954df2af",
              "status": "affected",
              "version": "d021c344051af91f42c5ba9fdedc176740cbd238",
              "versionType": "git"
            },
            {
              "lessThan": "67432915145848658149683101104e32f9fd6559",
              "status": "affected",
              "version": "d021c344051af91f42c5ba9fdedc176740cbd238",
              "versionType": "git"
            },
            {
              "lessThan": "eeca93f06df89be5a36305b7b9dae1ed65550dfc",
              "status": "affected",
              "version": "d021c344051af91f42c5ba9fdedc176740cbd238",
              "versionType": "git"
            },
            {
              "lessThan": "5998da5a8208ae9ad7838ba322bccb2bdcd95e81",
              "status": "affected",
              "version": "d021c344051af91f42c5ba9fdedc176740cbd238",
              "versionType": "git"
            },
            {
              "lessThan": "f1c170cae285e4b8f61be043bb17addc3d0a14b5",
              "status": "affected",
              "version": "d021c344051af91f42c5ba9fdedc176740cbd238",
              "versionType": "git"
            },
            {
              "lessThan": "ab6b19f690d89ae4709fba73a3c4a7911f495b7a",
              "status": "affected",
              "version": "d021c344051af91f42c5ba9fdedc176740cbd238",
              "versionType": "git"
            },
            {
              "lessThan": "002541ef650b742a198e4be363881439bb9d86b4",
              "status": "affected",
              "version": "d021c344051af91f42c5ba9fdedc176740cbd238",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/vmw_vsock/af_vsock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.9"
            },
            {
              "lessThan": "3.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.302",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.247",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.197",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.159",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.118",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.60",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "affectedData": [
        {
          "defaultStatus": "unknown",
          "product": "RUGGEDCOM RST2428P",
          "vendor": "Siemens",
          "versions": [
            {
              "lessThan": "V4.0",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
    }
  ],
  "cveTags": [],
  "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/"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nvsock: Ignorar se\u00f1al/tiempo de espera en connect() si ya est\u00e1 establecida\n\nDurante connect(), actuar sobre una se\u00f1al/tiempo de espera al desconectar un socket ya establecido conduce a varios problemas:\n\n1. connect() invocando vsock_transport_cancel_pkt()  -\u003e  virtio_transport_purge_skbs() puede competir con sendmsg() invocando virtio_transport_get_credit(). Esto resulta en un permanentemente elevado vvs -\u003e bytes_unsent. Lo cual, a su vez, confunde el manejo de SOCK_LINGER.\n\n2. connect() restableciendo el estado de un socket conectado puede competir con el socket siendo colocado en un sockmap. Un socket desconectado que permanece en un sockmap rompe las suposiciones de sockmap. Y da lugar a WARNs.\n\n3. connect() haciendo la transici\u00f3n SS_CONNECTED  -\u003e  SS_UNCONNECTED permite un cambio/ca\u00edda de transporte despu\u00e9s de TCP_ESTABLISHED. Lo cual plantea un problema para cualquier sendmsg() o connect() simult\u00e1neo y puede resultar en un uso despu\u00e9s de liberaci\u00f3n/desreferencia de puntero nulo.\n\nNo desconectar el socket en se\u00f1al/tiempo de espera. Mantener la l\u00f3gica para sockets no conectados: no persisten, no pueden ser colocados en un sockmap, son rechazados por sendmsg().\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/"
    }
  ],
  "id": "CVE-2025-40248",
  "lastModified": "2026-10-19T19:10:00.130",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-40248",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-16T20:01:10.557430Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-12-04T16:16:18.240",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/002541ef650b742a198e4be363881439bb9d86b4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3f71753935d648082a8279a97d30efe6b85be680"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5998da5a8208ae9ad7838ba322bccb2bdcd95e81"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/67432915145848658149683101104e32f9fd6559"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ab6b19f690d89ae4709fba73a3c4a7911f495b7a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/da664101fb4a0de5cb70d2bae6a650df954df2af"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/eeca93f06df89be5a36305b7b9dae1ed65550dfc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f1c170cae285e4b8f61be043bb17addc3d0a14b5"
    },
    {
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-253495.html"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}



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