CVE-2026-72436

Summary

In the Linux kernel, the following vulnerability has been resolved:

netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types

Sashiko pointed out that there are a few lockless RCU readers using test_bit() which is a relaxed atomic operation and provides no memory barrier guarantees. Use test_bit_acquire() instead where the operation may run parallel with add/del/gc, i.e. is not one from the next cases

  • protected by region lock
  • in a set destroy phase
  • in a new/temporary set creation phase

Affected Software

VendorProductVersion RangeStatus
LinuxLinux18f84d41d34fa35d0d64bbaea01fe664553ecc06 < c107233d2ff4fd7cef5d02f9124b99194957a710affected
LinuxLinux18f84d41d34fa35d0d64bbaea01fe664553ecc06 < 6329d3a9afe715fddda0460cfa46b496d61c2fe0affected
LinuxLinux18f84d41d34fa35d0d64bbaea01fe664553ecc06 < 7445fe965b7d8756070a40e80f8b73348ccda1d7affected
LinuxLinux18f84d41d34fa35d0d64bbaea01fe664553ecc06 < c4d257734e91bfcdc71d41843392dd6400b5bb1baffected
LinuxLinux18f84d41d34fa35d0d64bbaea01fe664553ecc06 < 3219d74e4536658c937fd878a327257b86ce80ddaffected
LinuxLinux18f84d41d34fa35d0d64bbaea01fe664553ecc06 < e4b4984e28c16406ecb318444dea4a8bf47def3eaffected
LinuxLinux4.2affected
LinuxLinux0 < 4.2unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References