Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: fix region locking in hash types Region locking introduced in v5.6-rc4 contained three macros to handle the region locks: ahash_bucket_start(), ahash_bucket_end() which gave back the start and end hash bucket values belonging to a given region lock and ahash_region() which should give back the region lock belonging to a given hash bucket. The latter was incorrect which can lead to a race condition between the garbage collector and adding new elements when a hash type of set is defined with timeouts.
Affected products
linux: linux kernel; debian: debian linux
References10
- git.kernel.org/stable/c/00cfc5fad1491796942a948808afb968a0a3f35b Patch
- git.kernel.org/stable/c/226ce0ec38316d9e3739e73a64b6b8304646c658 Patch
- git.kernel.org/stable/c/6e002ecc1c8cfdfc866b9104ab7888da54613e59 Patch
- git.kernel.org/stable/c/82c1eb32693bc48251d92532975e19160987e5b9 Patch
- git.kernel.org/stable/c/8478a729c0462273188263136880480729e9efca Patch
- git.kernel.org/stable/c/a3dfec485401943e315c394c29afe2db8f9481d6 Patch
- git.kernel.org/stable/c/aa77294b0f73bb8265987591460cd25b8722c3df Patch
- git.kernel.org/stable/c/e2ab67672b2288521a6146034a971f9a82ffc5c5 Patch
- lists.debian.org/debian-lts-announce/2025/08/msg00010.html Third Party Advisory
- lists.debian.org/debian-lts-announce/2025/10/msg00007.html Third Party Advisory
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 8 · as of 7 November 2026
- CWE
- CWE-667
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.