PT-2026-39044 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-06-01 · CVE-2026-43383

Positive Technologies (AI Summary)

CVSS v3.1

9.4

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A timing attack is possible because Message Authentication Codes (MACs) are not compared in constant time. This allows an attacker to potentially deduce information by measuring the time the system takes to perform the comparison.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2026-43383

Affected Products

Linux Kernel

References · 19

• https://git.kernel.org/stable/c/821c8751fdeecdeecabeb11704dd33439c9e4bbc · Patch
• https://git.kernel.org/stable/c/ae3831b44f477de048287493e184fc3ff913b624 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-43383 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-43383 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43383 · Vendor Advisory
• https://git.kernel.org/stable/c/02669e2a4d207068edce7e8b5fafd85822018ce6 · Patch
• https://git.kernel.org/stable/c/b502e97e29d791ff7a8051f29a414535739be218 · Patch
• https://git.kernel.org/stable/c/345a9530756528d7ca407663d659c3c40e75c3dd · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43383 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-43383 · Security Note
• https://osv.dev/vulnerability/BELL-CVE-2026-43383 · Vendor Advisory
• https://git.kernel.org/stable/c/5d305a95130a8d08b9545e47f1e18d29d59866cb · Patch
• https://ubuntu.com/security/CVE-2026-43383 · Vendor Advisory
• https://git.kernel.org/stable/c/46d0d6f50dab706637f4c18a470aac20a21900d3 · Patch
• https://twitter.com/CVEnew/status/2052810987690975377 · Twitter Post