CVE-2026-64046net: tls: prevent chain-after-chain in plain text SG
- 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: prevent chain-after-chain in plain text SG Sashiko points out that if end = 0 (start != 0) the current code will create a chain link to content type right after the wrap link: This would create a chain where the wrap link points directly to another chain link. The scatterlist API sg_next iterator does not recursively resolve consecutive chain links. meaning this is illegal input to crypto. The wrapping link is unnecessary if end = 0. end is the entry after the last one used so end = 0 means there's nothing pushed after the wrap: end start i v v v [ ]...[ ][ d ][ d ][ d ][ d ][rsv for wrap] Skip the wrapping in this case. TLS 1.3 can use the "wrapping slot" for it's chaining if end = 0. This avoids the chain-after-chain. Move the wrap chaining before marking END and chaining off content type, that feels like more logical ordering to me, but should not matter from functional perspective.
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 – < 49a5faaa471ddcd37b6893970c9916eb836e7c31
- affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec – < 91359966e247c0244c66d50bbb8e74aefa4321c3
- affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec – < 410351158dfef2d67fea6603680b3a6013c6ed9d
- affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec – < acdc12b71c9aa4be5dcd2c8062753c6d2033e235
- affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec – < 929b1548e63ac72e104c07d8ee8cbbeeba2fa89a
- affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec – < af855f4c966afafef74faf8390c7b86568c0d46d
- affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec – < b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36
- affected 9aaaa56845a06aeabdd597cbe19492dc01f281ec – < ff26a0e8377dec07e4a7230db7675bed1b9a6d03
- 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/49a5faaa471ddcd37b6893970c9916eb836e7c31 (opens in a new tab)
- https://git.kernel.org/stable/c/91359966e247c0244c66d50bbb8e74aefa4321c3 (opens in a new tab)
- https://git.kernel.org/stable/c/410351158dfef2d67fea6603680b3a6013c6ed9d (opens in a new tab)
- https://git.kernel.org/stable/c/acdc12b71c9aa4be5dcd2c8062753c6d2033e235 (opens in a new tab)
- https://git.kernel.org/stable/c/929b1548e63ac72e104c07d8ee8cbbeeba2fa89a (opens in a new tab)
- https://git.kernel.org/stable/c/af855f4c966afafef74faf8390c7b86568c0d46d (opens in a new tab)
- https://git.kernel.org/stable/c/b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36 (opens in a new tab)
- https://git.kernel.org/stable/c/ff26a0e8377dec07e4a7230db7675bed1b9a6d03 (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-2026-45619 (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-2026-64046)Record last updated .