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CVE-2026-72436

CRITICALCVSS 9.8/10EPSS 0.21%

Last modified

CVE-2026-72436 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1
9.8/10

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

EPSS Probability
0.21%

12.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 18f84d41d34fa35d0d64bbaea01fe664553ecc06, < c107233d2ff4fd7cef5d02f9124b99194957a710; >= 18f84d41d34fa35d0d64bbaea01fe664553ecc06, < 6329d3a9afe715fddda0460cfa46b496d61c2fe0; >= 18f84d41d34fa35d0d64bbaea01fe664553ecc06, < 7445fe965b7d8756070a40e80f8b73348ccda1d7; >= 18f84d41d34fa35d0d64bbaea01fe664553ecc06, < c4d257734e91bfcdc71d41843392dd6400b5bb1b; >= 18f84d41d34fa35d0d64bbaea01fe664553ecc06, < 3219d74e4536658c937fd878a327257b86ce80dd; >= 18f84d41d34fa35d0d64bbaea01fe664553ecc06, < e4b4984e28c16406ecb318444dea4a8bf47def3e
LinuxLinux4.2

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-72436?
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
How severe is CVE-2026-72436?
CVE-2026-72436 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-72436?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST