CVE-2026-64047net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring
- 9.8CriticalCVSS base score
- 0.51%Exploitation in 30 daysEPSS · top 56% 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: net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring When an sk_msg scatterlist ring wraps (sg.end < sg.start), tls_push_record() chains the tail portion of the ring to the head using sg_chain(). An extra entry in the sg array is reserved for this: struct sk_msg_sg { [...] /* The extra two elements: * 1) used for chaining the front and sections when the list becomes * partitioned (e.g. end < start). The crypto APIs require the * chaining; * 2) to chain tailer SG entries after the message. */ struct scatterlist data[MAX_MSG_FRAGS + 2]; The current code uses MAX_SKB_FRAGS + 1 as the ring size: sg_chain(&msg_pl->sg.data[msg_pl->sg.start], MAX_SKB_FRAGS - msg_pl->sg.start + 1, msg_pl->sg.data); This places the chain pointer at sg_chain(data[start], (MAX_SKB_FRAGS - msg_start + 1) .. = &data[start] + (MAX_SKB_FRAGS - msg_start + 1) - 1 = data[start + (MAX_SKB_FRAGS - start + 1) - 1] = data[MAX_SKB_FRAGS] instead of the true last entry. This is likely due to a "race" of the commit under Fixes landing close to commit 031097d9e079 ("bpf: sk_msg, zap ingress queue on psock down") Convert to ARRAY_SIZE and drop the data[start] / - start (as suggested by Sabrina).
Timeline
ID reserved
By Linux
Published
- 3 months later
· 3 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 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.51% · top 56% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec – < 73963a375885d5ccb7def39fd0b4f542e0f343dd
- affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec – < 47110c3a9ac247b688657337f5981efcfcb240dc
- affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec – < 84158c2997159df4a0d70cd9c46774512d32a522
- affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec – < 131ef12057d92b77b636321b7849c69222405a97
- affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec – < 66339b71f105e6f83e0da3b9583d95077534fe1d
- affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec – < eca989eab4b2599dcb02f72140a7c08f08838520
- affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec – < 2fb0dc7e0099686c4e9d2732745d8a31b18c3628
- affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec – < 285943c6e7ca309bbea84b253745154241d9788a
- affected d529d6c9f7e3aaeac13c4948f79799ccb825f29d
- affected 5.4.14 – < 5.5
- affected 5.5
- unaffected < 5.5
- unaffected 5.10.258 – ≤ 5.10.*
- unaffected 5.15.209 – ≤ 5.15.*
- unaffected 6.1.175 – ≤ 6.1.*
- unaffected 6.6.142 – ≤ 6.6.*
- unaffected 6.12.92 – ≤ 6.12.*
- unaffected 6.18.34 – ≤ 6.18.*
- unaffected 7.0.11 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References8
- https://git.kernel.org/stable/c/73963a375885d5ccb7def39fd0b4f542e0f343dd (opens in a new tab)
- https://git.kernel.org/stable/c/47110c3a9ac247b688657337f5981efcfcb240dc (opens in a new tab)
- https://git.kernel.org/stable/c/84158c2997159df4a0d70cd9c46774512d32a522 (opens in a new tab)
- https://git.kernel.org/stable/c/131ef12057d92b77b636321b7849c69222405a97 (opens in a new tab)
- https://git.kernel.org/stable/c/66339b71f105e6f83e0da3b9583d95077534fe1d (opens in a new tab)
- https://git.kernel.org/stable/c/eca989eab4b2599dcb02f72140a7c08f08838520 (opens in a new tab)
- https://git.kernel.org/stable/c/2fb0dc7e0099686c4e9d2732745d8a31b18c3628 (opens in a new tab)
- https://git.kernel.org/stable/c/285943c6e7ca309bbea84b253745154241d9788a (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-2026-45620 (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)
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[](https://cveledger.app/cve/CVE-2026-64047)Record last updated .