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CVE-2026-43383

net/tcp-md5: Fix MAC comparison to be constant-time

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.253, 5.15.210, 6.1.167, 6.6.130, 6.12.78, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

In the Linux kernel, the following vulnerability has been resolved: net/tcp-md5: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.

Timeline

  1. CVE published
  2. CISA SSVC assessment

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

  3. Record last updated

Affected versions

  • Linux Linux

    From cfb6eeb4c860592edd123fdea908d23c6ad1c7dc · fixed in 821c8751fdeecdeecabeb11704dd33439c9e4bbc; From cfb6eeb4c860592edd123fdea908d23c6ad1c7dc · fixed in ff44ec94d4fc8348600a69de0a8fa1102c23bce8; From cfb6eeb4c860592edd123fdea908d23c6ad1c7dc · fixed in 345a9530756528d7ca407663d659c3c40e75c3dd; From cfb6eeb4c860592edd123fdea908d23c6ad1c7dc · fixed in 5d305a95130a8d08b9545e47f1e18d29d59866cb; From cfb6eeb4c860592edd123fdea908d23c6ad1c7dc · fixed in 02669e2a4d207068edce7e8b5fafd85822018ce6; From cfb6eeb4c860592edd123fdea908d23c6ad1c7dc · fixed in ae3831b44f477de048287493e184fc3ff913b624; From cfb6eeb4c860592edd123fdea908d23c6ad1c7dc · fixed in b502e97e29d791ff7a8051f29a414535739be218; From cfb6eeb4c860592edd123fdea908d23c6ad1c7dc · fixed in 46d0d6f50dab706637f4c18a470aac20a21900d3

  • Linux Linux

    2.6.20

  • KernelLinux

    From 2.6.20 · fixed in 5.10.253; From 5.11.0 · fixed in 5.15.210; From 5.16.0 · fixed in 6.1.167; From 6.2.0 · fixed in 6.6.130; From 6.7.0 · fixed in 6.12.78; From 6.13.0 · fixed in 6.18.19; From 6.19.0 · fixed in 6.19.9

References 8

git.kernel.org