CVE-2026-31418

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux8af1c6fbd9239877998c7f5a591cb2c88d41fb66 < c098ff857e7ca923539164af5b3c2fe3e8f8afafaffected
LinuxLinux8af1c6fbd9239877998c7f5a591cb2c88d41fb66 < 58f3a14826d4e6b0d5421f1a64be280b48601ea2affected
LinuxLinux8af1c6fbd9239877998c7f5a591cb2c88d41fb66 < ad92ee87462f9a3061361d392e9dbfe2e5c1c9fbaffected
LinuxLinux8af1c6fbd9239877998c7f5a591cb2c88d41fb66 < 6cea34d7ec6829b62f521a37a287f670144a2233affected
LinuxLinux8af1c6fbd9239877998c7f5a591cb2c88d41fb66 < b7eef00f08b92b0b9efe8ae0df6d0005e6199323affected
LinuxLinux8af1c6fbd9239877998c7f5a591cb2c88d41fb66 < 68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4affected
LinuxLinux8af1c6fbd9239877998c7f5a591cb2c88d41fb66 < ceacaa76f221a6577aba945bb8873c2e640aeba4affected
LinuxLinux8af1c6fbd9239877998c7f5a591cb2c88d41fb66 < 9862ef9ab0a116c6dca98842aab7de13a252ae02affected
LinuxLinux6c717726f341fd8f39a3ec2dcf5d98d9d28a2769affected
LinuxLinuxd2997d64dfa65082236bca1efd596b6c935daf5eaffected
LinuxLinux5.4.24 < 5.5affected
LinuxLinux5.5.8 < 5.6affected
LinuxLinux5.6affected
LinuxLinux0 < 5.6unaffected
LinuxLinux5.10.253 <= 5.10.*unaffected
LinuxLinux5.15.203 <= 5.15.*unaffected
LinuxLinux6.1.168 <= 6.1.*unaffected
LinuxLinux6.6.134 <= 6.6.*unaffected
LinuxLinux6.12.81 <= 6.12.*unaffected
LinuxLinux6.18.22 <= 6.18.*unaffected
LinuxLinux6.19.12 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References