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CVE-2026-64046

net: tls: prevent chain-after-chain in plain text SG

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.5, 5.10.258, 5.15.209, 6.1.175, 6.6.142, and 3 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: total

Summary

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

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 9aaaa56845a06aeabdd597cbe19492dc01f281ec · fixed in 49a5faaa471ddcd37b6893970c9916eb836e7c31; From 9aaaa56845a06aeabdd597cbe19492dc01f281ec · fixed in 91359966e247c0244c66d50bbb8e74aefa4321c3; From 9aaaa56845a06aeabdd597cbe19492dc01f281ec · fixed in 410351158dfef2d67fea6603680b3a6013c6ed9d; From 9aaaa56845a06aeabdd597cbe19492dc01f281ec · fixed in acdc12b71c9aa4be5dcd2c8062753c6d2033e235; From 9aaaa56845a06aeabdd597cbe19492dc01f281ec · fixed in 929b1548e63ac72e104c07d8ee8cbbeeba2fa89a; From 9aaaa56845a06aeabdd597cbe19492dc01f281ec · fixed in af855f4c966afafef74faf8390c7b86568c0d46d; From 9aaaa56845a06aeabdd597cbe19492dc01f281ec · fixed in b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36; From 9aaaa56845a06aeabdd597cbe19492dc01f281ec · fixed in ff26a0e8377dec07e4a7230db7675bed1b9a6d03; From 5.4.14 · fixed in 5.5

  • Linux Linux

    5.5

  • KernelLinux

    From 5.5.0 · fixed in 5.10.258; From 5.11.0 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.142; From 6.7.0 · fixed in 6.12.92; From 6.13.0 · fixed in 6.18.34; From 6.19.0 · fixed in 7.0.11

References 8

git.kernel.org