CVE-2026-64046net: tls: prevent chain-after-chain in plain text SG
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 9aaaa56845a06aeabdd597cbe19492dc01f281ec before 49a5faaa471ddcd37b6893970c9916eb836e7c31; from 9aaaa56845a06aeabdd597cbe19492dc01f281ec before 91359966e247c0244c66d50bbb8e74aefa4321c3; from 9aaaa56845a06aeabdd597cbe19492dc01f281ec before 410351158dfef2d67fea6603680b3a6013c6ed9d; from 9aaaa56845a06aeabdd597cbe19492dc01f281ec before acdc12b71c9aa4be5dcd2c8062753c6d2033e235; from 9aaaa56845a06aeabdd597cbe19492dc01f281ec before 929b1548e63ac72e104c07d8ee8cbbeeba2fa89a; from 9aaaa56845a06aeabdd597cbe19492dc01f281ec before af855f4c966afafef74faf8390c7b86568c0d46d; from 9aaaa56845a06aeabdd597cbe19492dc01f281ec before b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36; from 9aaaa56845a06aeabdd597cbe19492dc01f281ec before ff26a0e8377dec07e4a7230db7675bed1b9a6d03; and 2 more ranges | CNA record |
linux linux_kernel linux:linux_kernel | from 5.4.14 before 5.5; from 5.5.1 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.142; from 6.7 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11; and 5 more ranges | NVD |
References
- https://git.kernel.org/stable/c/49a5faaa471ddcd37b6893970c9916eb836e7c31patch
- https://git.kernel.org/stable/c/91359966e247c0244c66d50bbb8e74aefa4321c3patch
- https://git.kernel.org/stable/c/410351158dfef2d67fea6603680b3a6013c6ed9dpatch
- https://git.kernel.org/stable/c/acdc12b71c9aa4be5dcd2c8062753c6d2033e235patch
- https://git.kernel.org/stable/c/929b1548e63ac72e104c07d8ee8cbbeeba2fa89apatch
- https://git.kernel.org/stable/c/af855f4c966afafef74faf8390c7b86568c0d46dpatch
- https://git.kernel.org/stable/c/b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36patch
- https://git.kernel.org/stable/c/ff26a0e8377dec07e4a7230db7675bed1b9a6d03patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.