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Description

In 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.

PUBLISHED Reserved 2026-03-09 | Published 2026-04-13 | Updated 2026-05-23 | Assigner Linux

Product status

Default status
unaffected

8af1c6fbd9239877998c7f5a591cb2c88d41fb66 (git) before c098ff857e7ca923539164af5b3c2fe3e8f8afaf
affected

8af1c6fbd9239877998c7f5a591cb2c88d41fb66 (git) before 58f3a14826d4e6b0d5421f1a64be280b48601ea2
affected

8af1c6fbd9239877998c7f5a591cb2c88d41fb66 (git) before ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb
affected

8af1c6fbd9239877998c7f5a591cb2c88d41fb66 (git) before 6cea34d7ec6829b62f521a37a287f670144a2233
affected

8af1c6fbd9239877998c7f5a591cb2c88d41fb66 (git) before b7eef00f08b92b0b9efe8ae0df6d0005e6199323
affected

8af1c6fbd9239877998c7f5a591cb2c88d41fb66 (git) before 68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4
affected

8af1c6fbd9239877998c7f5a591cb2c88d41fb66 (git) before ceacaa76f221a6577aba945bb8873c2e640aeba4
affected

8af1c6fbd9239877998c7f5a591cb2c88d41fb66 (git) before 9862ef9ab0a116c6dca98842aab7de13a252ae02
affected

6c717726f341fd8f39a3ec2dcf5d98d9d28a2769 (git)
affected

d2997d64dfa65082236bca1efd596b6c935daf5e (git)
affected

5.4.24 (semver) before 5.5
affected

5.5.8 (semver) before 5.6
affected

Default status
affected

5.6
affected

Any version before 5.6
unaffected

5.10.253 (semver)
unaffected

5.15.203 (semver)
unaffected

6.1.168 (semver)
unaffected

6.6.134 (semver)
unaffected

6.12.81 (semver)
unaffected

6.18.22 (semver)
unaffected

6.19.12 (semver)
unaffected

7.0 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/c098ff857e7ca923539164af5b3c2fe3e8f8afaf

git.kernel.org/...c/58f3a14826d4e6b0d5421f1a64be280b48601ea2

git.kernel.org/...c/ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb

git.kernel.org/...c/6cea34d7ec6829b62f521a37a287f670144a2233

git.kernel.org/...c/b7eef00f08b92b0b9efe8ae0df6d0005e6199323

git.kernel.org/...c/68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4

git.kernel.org/...c/ceacaa76f221a6577aba945bb8873c2e640aeba4

git.kernel.org/...c/9862ef9ab0a116c6dca98842aab7de13a252ae02

cve.org (CVE-2026-31418)

nvd.nist.gov (CVE-2026-31418)

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