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

Vulnerability from cvelistv5 – Published: 2025-12-04 16:08 – Updated: 2026-06-02 12:59
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.
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
To clipboard 

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "defaultStatus": "unknown",
            "product": "RUGGEDCOM RST2428P",
            "vendor": "Siemens",
            "versions": [
              {
                "lessThan": "V4.0",
                "status": "affected",
                "version": "0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-02T12:59:57.735Z",
          "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
          "shortName": "siemens-SADP"
        },
        "references": [
          {
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-253495.html"
          }
        ],
        "x_adpType": "supplier"
      }
    ],
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.302",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.247",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.197",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.159",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.118",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.60",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.10",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "3.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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/"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:45:39.557Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
        }
      ],
      "title": "vsock: Ignore signal/timeout on connect() if already established",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40248",
    "datePublished": "2025-12-04T16:08:11.509Z",
    "dateReserved": "2025-04-16T07:20:57.181Z",
    "dateUpdated": "2026-06-02T12:59:57.735Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-40248",
      "date": "2026-06-02",
      "epss": "0.00057",
      "percentile": "0.18091"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40248\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-04T16:16:18.240\",\"lastModified\":\"2026-06-02T14:16:30.903\",\"vulnStatus\":\"Deferred\",\"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/\"}],\"metrics\":{},\"references\":[{\"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\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-253495.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.