netfilter: ipset: drop logically empty buckets in mtype_del

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Summary

CVECVE-2026-31418
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-13 14:16:11 UTC
Updated2026-05-20 19:32:14 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: drop logically empty buckets in mtype_del mtype_del() counts empty slots below n->pos in k, but it only drops the bucket when both n->pos and k are zero. This misses buckets whose live entries have all been removed while n->pos still points past deleted slots. Treat a bucket as empty when all positions below n->pos are unused and release it directly instead of shrinking it further.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.000320000 probability, percentile 0.092520000 (date 2026-04-21)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 c098ff857e7ca923539164af5b3c2fe3e8f8afaf git Not specified
CNA Linux Linux affected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 58f3a14826d4e6b0d5421f1a64be280b48601ea2 git Not specified
CNA Linux Linux affected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb git Not specified
CNA Linux Linux affected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 6cea34d7ec6829b62f521a37a287f670144a2233 git Not specified
CNA Linux Linux affected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 b7eef00f08b92b0b9efe8ae0df6d0005e6199323 git Not specified
CNA Linux Linux affected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4 git Not specified
CNA Linux Linux affected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 ceacaa76f221a6577aba945bb8873c2e640aeba4 git Not specified
CNA Linux Linux affected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 9862ef9ab0a116c6dca98842aab7de13a252ae02 git Not specified
CNA Linux Linux affected 6c717726f341fd8f39a3ec2dcf5d98d9d28a2769 git Not specified
CNA Linux Linux affected d2997d64dfa65082236bca1efd596b6c935daf5e git Not specified
CNA Linux Linux affected 5.6 Not specified
CNA Linux Linux unaffected 5.6 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b7eef00f08b92b0b9efe8ae0df6d0005e6199323 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/58f3a14826d4e6b0d5421f1a64be280b48601ea2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6cea34d7ec6829b62f521a37a287f670144a2233 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9862ef9ab0a116c6dca98842aab7de13a252ae02 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ceacaa76f221a6577aba945bb8873c2e640aeba4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c098ff857e7ca923539164af5b3c2fe3e8f8afaf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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