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Critical 9.4Published May 8, 2026
CVE-2026-43383net/tcp-md5: Fix MAC comparison to be constant-time
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/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.
- CVSS
- 9.4 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from cfb6eeb4c860592edd123fdea908d23c6ad1c7dc before 821c8751fdeecdeecabeb11704dd33439c9e4bbc; from cfb6eeb4c860592edd123fdea908d23c6ad1c7dc before ff44ec94d4fc8348600a69de0a8fa1102c23bce8; from cfb6eeb4c860592edd123fdea908d23c6ad1c7dc before 345a9530756528d7ca407663d659c3c40e75c3dd; from cfb6eeb4c860592edd123fdea908d23c6ad1c7dc before 5d305a95130a8d08b9545e47f1e18d29d59866cb; from cfb6eeb4c860592edd123fdea908d23c6ad1c7dc before 02669e2a4d207068edce7e8b5fafd85822018ce6; from cfb6eeb4c860592edd123fdea908d23c6ad1c7dc before ae3831b44f477de048287493e184fc3ff913b624; from cfb6eeb4c860592edd123fdea908d23c6ad1c7dc before b502e97e29d791ff7a8051f29a414535739be218; from cfb6eeb4c860592edd123fdea908d23c6ad1c7dc before 46d0d6f50dab706637f4c18a470aac20a21900d3 | CNA record |
linux linux_kernel linux:linux_kernel | from 2.6.20 before 5.10.253; from 5.11 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.19; from 6.19 before 6.19.9; 7.0; 7.0 | NVD |
References
- https://git.kernel.org/stable/c/821c8751fdeecdeecabeb11704dd33439c9e4bbcpatch
- https://git.kernel.org/stable/c/ff44ec94d4fc8348600a69de0a8fa1102c23bce8
- https://git.kernel.org/stable/c/345a9530756528d7ca407663d659c3c40e75c3ddpatch
- https://git.kernel.org/stable/c/5d305a95130a8d08b9545e47f1e18d29d59866cbpatch
- https://git.kernel.org/stable/c/02669e2a4d207068edce7e8b5fafd85822018ce6patch
- https://git.kernel.org/stable/c/ae3831b44f477de048287493e184fc3ff913b624patch
- https://git.kernel.org/stable/c/b502e97e29d791ff7a8051f29a414535739be218patch
- https://git.kernel.org/stable/c/46d0d6f50dab706637f4c18a470aac20a21900d3patch
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.