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CVE

CVE-2026-72436

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

CVE-2026-72436

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

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 testbitacquire()

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

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/3219d74e4536658c937fd878a327257b86ce80dd, https://git.kernel.org/stable/c/6329d3a9afe715fddda0460cfa46b496d61c2fe0, https://git.kernel.org/stable/c/7445fe965b7d8756070a40e80f8b73348ccda1d7, https://git.kernel.org/stable/c/c107233d2ff4fd7cef5d02f9124b99194957a710, https://git.kernel.org/stable/c/c4d257734e91bfcdc71d41843392dd6400b5bb1b, https://git.kernel.org/stable/c/e4b4984e28c16406ecb318444dea4a8bf47def3e, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72436.json, https://nvd.nist.gov/vuln/detail/CVE-2026-72436, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00712%
EPSS Percentile
0.50935%
Introduced Version
18f84d41d34fa35d0d64bbaea01fe664553ecc06,4.2.0,6.2.0,6.7.0,6.13.0,6.19.0,0
Fix Available
e4b4984e28c16406ecb318444dea4a8bf47def3e,6.1.178,6.6.145,6.12.97,6.18.40,7.1.5,6.1.180-1,6.12.100-1

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