CVE-2025-40248
Full vulnerability record from the local CVENow database.
Description
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/[email protected]/ [2]: https://lore.kernel.org/netdev/[email protected]/ [3]: https://lore.kernel.org/netdev/[email protected]/
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Deferred
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-12-04 16:16:18.240000
Last modified
2026-10-19 19:10:00.130000
View original CVE JSON
{
"id": "CVE-2025-40248",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-12-04T16:16:18.240",
"lastModified": "2026-10-19T19:10:00.130",
"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() ->\n virtio_transport_purge_skbs() may race with sendmsg() invoking\n virtio_transport_get_credit(). This results in a permanently elevated\n `vvs->bytes_unsent`. Which, in turn, confuses the SOCK_LINGER handling.\n\n2. connect() resetting a connected socket's state may race with socket\n being placed in a sockmap. A disconnected socket remaining in a sockmap\n breaks sockmap's assumptions. And gives rise to WARNs.\n\n3. connect() transitioning SS_CONNECTED -> 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't linger, can't be placed in a sockmap, are rejected by\nsendmsg().\n\n[1]: https://lore.kernel.org/netdev/[email protected]/\n[2]: https://lore.kernel.org/netdev/[email protected]/\n[3]: https://lore.kernel.org/netdev/[email protected]/"
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nvsock: Ignorar señal/tiempo de espera en connect() si ya está establecida\n\nDurante connect(), actuar sobre una señal/tiempo de espera al desconectar un socket ya establecido conduce a varios problemas:\n\n1. connect() invocando vsock_transport_cancel_pkt() -> virtio_transport_purge_skbs() puede competir con sendmsg() invocando virtio_transport_get_credit(). Esto resulta en un permanentemente elevado vvs -> 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 transición SS_CONNECTED -> SS_UNCONNECTED permite un cambio/caída de transporte después de TCP_ESTABLISHED. Lo cual plantea un problema para cualquier sendmsg() o connect() simultáneo y puede resultar en un uso después de liberación/desreferencia de puntero nulo.\n\nNo desconectar el socket en señal/tiempo de espera. Mantener la lógica 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/[email protected]/\n[2]: https://lore.kernel.org/netdev/[email protected]/\n[3]: https://lore.kernel.org/netdev/[email protected]/"
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"net/vmw_vsock/af_vsock.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"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",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"net/vmw_vsock/af_vsock.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "3.9",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.9",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.4.302",
"lessThanOrEqual": "5.4.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.247",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.197",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.159",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.118",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.60",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.17.10",
"lessThanOrEqual": "6.17.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"affectedData": [
{
"vendor": "Siemens",
"product": "RUGGEDCOM RST2428P",
"defaultStatus": "unknown",
"versions": [
{
"version": "0",
"lessThan": "V4.0",
"versionType": "custom",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-06-16T20:01:10.557430Z",
"id": "CVE-2025-40248",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"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"
}
]
}