CVE-2026-43383CWE-208

CVE-2026-43383

Critical · published May 8, 2026

CVSS v3.1
9.4
EPSS
0%
Percentile
37.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.4 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00443 · 37.5th percentile
Weakness
CWE-208 · Observable Timing Discrepancy
Published
2026-05-08T19:16Z
Affected products (8)
ProductVersionsFixed in
linux/linux_kernel≥ 2.6.20, < 5.10.2535.10.253
linux/linux_kernel≥ 5.11, < 6.1.1676.1.167
linux/linux_kernel≥ 6.2, < 6.6.1306.6.130
linux/linux_kernel≥ 6.7, < 6.12.786.12.78
linux/linux_kernel≥ 6.13, < 6.18.196.18.19
linux/linux_kernel≥ 6.19, < 6.19.96.19.9
linux/linux_kernelall versions—
linux/linux_kernelall versions—
References (8)
https://git.kernel.org/stable/c/02669e2a4d207068edce7e8b5fafd85822018ce6 · 416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/345a9530756528d7ca407663d659c3c40e75c3dd · 416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/46d0d6f50dab706637f4c18a470aac20a21900d3 · 416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5d305a95130a8d08b9545e47f1e18d29d59866cb · 416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/821c8751fdeecdeecabeb11704dd33439c9e4bbc · 416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ae3831b44f477de048287493e184fc3ff913b624 · 416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b502e97e29d791ff7a8051f29a414535739be218 · 416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff44ec94d4fc8348600a69de0a8fa1102c23bce8 · 416baaa9-dc9f-4396-8d5f-8c081fb06d67
EPSS history
Timeline
  • 08 MAY 14:21Z
    net/tcp-md5: Fix MAC comparison to be constant-time
    cvelistv5