CVE-2026-31418

netfilter: ipset: drop logically empty buckets in mtype_del

State: Published
Severity: Not scored
Published: Apr 13, 2026
Updated: Oct 15, 2026
Reserved: Mar 9, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	8af1c6fbd9239877998c7f5a591cb2c88d41fb66 to before c098ff857e7ca923539164af5b3c2fe3e8f8afafAffected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 to before 58f3a14826d4e6b0d5421f1a64be280b48601ea2Affected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 to before ad92ee87462f9a3061361d392e9dbfe2e5c1c9fbAffected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 to before 6cea34d7ec6829b62f521a37a287f670144a2233Affected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 to before b7eef00f08b92b0b9efe8ae0df6d0005e6199323Affected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 to before 68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4Affected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 to before ceacaa76f221a6577aba945bb8873c2e640aeba4Affected 8af1c6fbd9239877998c7f5a591cb2c88d41fb66 to before 9862ef9ab0a116c6dca98842aab7de13a252ae02Affected 6c717726f341fd8f39a3ec2dcf5d98d9d28a2769Affected d2997d64dfa65082236bca1efd596b6c935daf5eAffected 5.4.24 to before 5.5Affected 5.5.8 to before 5.6Affected
LinuxLinux	5.6Affected before 5.6Not affected 5.10.253 through 5.10.Not affected 5.15.203 through 5.15.Not affected 6.1.168 through 6.1.Not affected 6.6.134 through 6.6.Not affected 6.12.81 through 6.12.Not affected 6.18.22 through 6.18.Not affected 6.19.12 through 6.19.*Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

8af1c6fbd9239877998c7f5a591cb2c88d41fb66 to before c098ff857e7ca923539164af5b3c2fe3e8f8afafAffected
8af1c6fbd9239877998c7f5a591cb2c88d41fb66 to before 58f3a14826d4e6b0d5421f1a64be280b48601ea2Affected
8af1c6fbd9239877998c7f5a591cb2c88d41fb66 to before ad92ee87462f9a3061361d392e9dbfe2e5c1c9fbAffected
8af1c6fbd9239877998c7f5a591cb2c88d41fb66 to before 6cea34d7ec6829b62f521a37a287f670144a2233Affected
8af1c6fbd9239877998c7f5a591cb2c88d41fb66 to before b7eef00f08b92b0b9efe8ae0df6d0005e6199323Affected
8af1c6fbd9239877998c7f5a591cb2c88d41fb66 to before 68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4Affected
8af1c6fbd9239877998c7f5a591cb2c88d41fb66 to before ceacaa76f221a6577aba945bb8873c2e640aeba4Affected
8af1c6fbd9239877998c7f5a591cb2c88d41fb66 to before 9862ef9ab0a116c6dca98842aab7de13a252ae02Affected
6c717726f341fd8f39a3ec2dcf5d98d9d28a2769Affected
d2997d64dfa65082236bca1efd596b6c935daf5eAffected
5.4.24 to before 5.5Affected
5.5.8 to before 5.6Affected

LinuxLinux

5.6Affected
before 5.6Not affected
5.10.253 through 5.10.*Not affected
5.15.203 through 5.15.*Not affected
6.1.168 through 6.1.*Not affected
6.6.134 through 6.6.*Not affected
6.12.81 through 6.12.*Not affected
6.18.22 through 6.18.*Not affected
6.19.12 through 6.19.*Not affected
7.0 and laterNot affected

References

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