CVE-2024-40931mptcp: ensure snd_una is properly initialized on connect
- 5.5MediumCVSS base score
- 0.25%Exploitation in 30 daysEPSS · top 83% 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: mptcp: ensure snd_una is properly initialized on connect This is strictly related to commit fb7a0d334894 ("mptcp: ensure snd_nxt is properly initialized on connect"). It turns out that syzkaller can trigger the retransmit after fallback and before processing any other incoming packet - so that snd_una is still left uninitialized. Address the issue explicitly initializing snd_una together with snd_nxt and write_seq.
Timeline
ID reserved
By Linux
Published
- 22 months later
· 22 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 |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.25% · top 83% 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: Medium 5.5.
Affected products
- affected 8fd738049ac3d67a937d36577763b47180aae1ad – < 208cd22ef5e57f82d38ec11c1a1703f9401d6dde
- affected 8fd738049ac3d67a937d36577763b47180aae1ad – < 7b9c7fc8600b64a86e4b47b2d190bba380267726
- affected 8fd738049ac3d67a937d36577763b47180aae1ad – < f03c46eabb3a67bd2993e237ab5517f00a5f1813
- affected 8fd738049ac3d67a937d36577763b47180aae1ad – < f1f0a46f8bb8890b90ab7194f0a0c8fe2a3fb57f
- affected 8fd738049ac3d67a937d36577763b47180aae1ad – < ef473bf1dd7e8dd08bcc04b9e2d1bfed69a0a7ce
- affected 8fd738049ac3d67a937d36577763b47180aae1ad – < 8031b58c3a9b1db3ef68b3bd749fbee2e1e1aaa3
- affected 5.9
- unaffected < 5.9
- unaffected 5.10.221 – ≤ 5.10.*
- unaffected 5.15.162 – ≤ 5.15.*
- unaffected 6.1.95 – ≤ 6.1.*
- unaffected 6.6.35 – ≤ 6.6.*
- unaffected 6.9.6 – ≤ 6.9.*
- unaffected 6.10 – ≤ *
References
References7
- https://git.kernel.org/stable/c/208cd22ef5e57f82d38ec11c1a1703f9401d6dde (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/7b9c7fc8600b64a86e4b47b2d190bba380267726 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/f03c46eabb3a67bd2993e237ab5517f00a5f1813 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/f1f0a46f8bb8890b90ab7194f0a0c8fe2a3fb57f (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/ef473bf1dd7e8dd08bcc04b9e2d1bfed69a0a7ce (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/8031b58c3a9b1db3ef68b3bd749fbee2e1e1aaa3 (opens in a new tab)x_transferred
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.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-2024-38742 (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-2024-40931)Record last updated .