CVE-2025-40248vsock: Ignore signal/timeout on connect() if already established
- 7.8HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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]/
Timeline
ID reserved
By Linux
- 8 months later
· 8 months later
Published
- 8 months later
· 8 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Deferred | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected d021c344051af91f42c5ba9fdedc176740cbd238 – < 3f71753935d648082a8279a97d30efe6b85be680
- affected d021c344051af91f42c5ba9fdedc176740cbd238 – < da664101fb4a0de5cb70d2bae6a650df954df2af
- affected d021c344051af91f42c5ba9fdedc176740cbd238 – < 67432915145848658149683101104e32f9fd6559
- affected d021c344051af91f42c5ba9fdedc176740cbd238 – < eeca93f06df89be5a36305b7b9dae1ed65550dfc
- affected d021c344051af91f42c5ba9fdedc176740cbd238 – < 5998da5a8208ae9ad7838ba322bccb2bdcd95e81
- affected d021c344051af91f42c5ba9fdedc176740cbd238 – < f1c170cae285e4b8f61be043bb17addc3d0a14b5
- affected d021c344051af91f42c5ba9fdedc176740cbd238 – < ab6b19f690d89ae4709fba73a3c4a7911f495b7a
- affected d021c344051af91f42c5ba9fdedc176740cbd238 – < 002541ef650b742a198e4be363881439bb9d86b4
- affected 3.9
- unaffected < 3.9
- unaffected 5.4.302 – ≤ 5.4.*
- unaffected 5.10.247 – ≤ 5.10.*
- unaffected 5.15.197 – ≤ 5.15.*
- unaffected 6.1.159 – ≤ 6.1.*
- unaffected 6.6.118 – ≤ 6.6.*
- unaffected 6.12.60 – ≤ 6.12.*
- unaffected 6.17.10 – ≤ 6.17.*
- unaffected 6.18 – ≤ *
References
References9
- https://git.kernel.org/stable/c/3f71753935d648082a8279a97d30efe6b85be680 (opens in a new tab)
- https://git.kernel.org/stable/c/da664101fb4a0de5cb70d2bae6a650df954df2af (opens in a new tab)
- https://git.kernel.org/stable/c/67432915145848658149683101104e32f9fd6559 (opens in a new tab)
- https://git.kernel.org/stable/c/eeca93f06df89be5a36305b7b9dae1ed65550dfc (opens in a new tab)
- https://git.kernel.org/stable/c/5998da5a8208ae9ad7838ba322bccb2bdcd95e81 (opens in a new tab)
- https://git.kernel.org/stable/c/f1c170cae285e4b8f61be043bb17addc3d0a14b5 (opens in a new tab)
- https://git.kernel.org/stable/c/ab6b19f690d89ae4709fba73a3c4a7911f495b7a (opens in a new tab)
- https://git.kernel.org/stable/c/002541ef650b742a198e4be363881439bb9d86b4 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-253495.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-201209 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-40248)Record last updated .