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

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Summary

CVECVE-2026-43383
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 15:16:49 UTC
Updated2026-05-11 08:16:12 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 9.4 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H

EPSS: 0.000240000 probability, percentile 0.070400000 (date 2026-05-10)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.4CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
3.1CNADECLARED9.4CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected cfb6eeb4c860592edd123fdea908d23c6ad1c7dc 821c8751fdeecdeecabeb11704dd33439c9e4bbc git Not specified
CNA Linux Linux affected cfb6eeb4c860592edd123fdea908d23c6ad1c7dc 345a9530756528d7ca407663d659c3c40e75c3dd git Not specified
CNA Linux Linux affected cfb6eeb4c860592edd123fdea908d23c6ad1c7dc 5d305a95130a8d08b9545e47f1e18d29d59866cb git Not specified
CNA Linux Linux affected cfb6eeb4c860592edd123fdea908d23c6ad1c7dc 02669e2a4d207068edce7e8b5fafd85822018ce6 git Not specified
CNA Linux Linux affected cfb6eeb4c860592edd123fdea908d23c6ad1c7dc ae3831b44f477de048287493e184fc3ff913b624 git Not specified
CNA Linux Linux affected cfb6eeb4c860592edd123fdea908d23c6ad1c7dc b502e97e29d791ff7a8051f29a414535739be218 git Not specified
CNA Linux Linux affected cfb6eeb4c860592edd123fdea908d23c6ad1c7dc 46d0d6f50dab706637f4c18a470aac20a21900d3 git Not specified
CNA Linux Linux affected 2.6.20 Not specified
CNA Linux Linux unaffected 2.6.20 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 6.1.167 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.19 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.9 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/821c8751fdeecdeecabeb11704dd33439c9e4bbc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b502e97e29d791ff7a8051f29a414535739be218 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5d305a95130a8d08b9545e47f1e18d29d59866cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/46d0d6f50dab706637f4c18a470aac20a21900d3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ae3831b44f477de048287493e184fc3ff913b624 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/02669e2a4d207068edce7e8b5fafd85822018ce6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/345a9530756528d7ca407663d659c3c40e75c3dd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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