CVE-2026-43383 PUBLISHED

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

Assigner: Linux
Reserved: 01.05.2026 Published: 08.05.2026 Updated: 08.05.2026

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.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from cfb6eeb4c860592edd123fdea908d23c6ad1c7dc to 821c8751fdeecdeecabeb11704dd33439c9e4bbc (excl.)
  • affected from cfb6eeb4c860592edd123fdea908d23c6ad1c7dc to 345a9530756528d7ca407663d659c3c40e75c3dd (excl.)
  • affected from cfb6eeb4c860592edd123fdea908d23c6ad1c7dc to 5d305a95130a8d08b9545e47f1e18d29d59866cb (excl.)
  • affected from cfb6eeb4c860592edd123fdea908d23c6ad1c7dc to 02669e2a4d207068edce7e8b5fafd85822018ce6 (excl.)
  • affected from cfb6eeb4c860592edd123fdea908d23c6ad1c7dc to ae3831b44f477de048287493e184fc3ff913b624 (excl.)
  • affected from cfb6eeb4c860592edd123fdea908d23c6ad1c7dc to b502e97e29d791ff7a8051f29a414535739be218 (excl.)
  • affected from cfb6eeb4c860592edd123fdea908d23c6ad1c7dc to 46d0d6f50dab706637f4c18a470aac20a21900d3 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 2.6.20 is affected
  • unaffected from 0 to 2.6.20 (excl.)
  • unaffected from 5.10.253 to 5.10.* (incl.)
  • unaffected from 6.1.167 to 6.1.* (incl.)
  • unaffected from 6.6.130 to 6.6.* (incl.)
  • unaffected from 6.12.78 to 6.12.* (incl.)
  • unaffected from 6.18.19 to 6.18.* (incl.)
  • unaffected from 6.19.9 to 6.19.* (incl.)
  • unaffected from 7.0 to * (incl.)

References