Medium 5.5Published May 27, 2026

CVE-2026-45897netfilter: nft_counter: serialize reset with spinlock

Updated under an hour ago (Oct 26, 2026, 8:30 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_counter: serialize reset with spinlock Add a global static spinlock to serialize counter fetch+reset operations, preventing concurrent dump-and-reset from underrunning values. The lock is taken before fetching the total so that two parallel resets cannot both read the same counter values and then both subtract them. A global lock is used for simplicity since resets are infrequent. If this becomes a bottleneck, it can be replaced with a per-net lock later.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Sep 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from fb1adb05ea87b6149e65a31e511756c4f470d0cd before e13194e60217db02c2e7202375d9e5951267d87b; from f123293db16dcd0cd81b246ae60e6362f0025d0a before de6601f1374fab124cd9276df6671f64d940ceb4; from 3cb03edb4de33fd04c4ea55f47397b96a8657c53 before 48cf7918d10c66cb6b05226fa3fa5daf0c891089; from 3cb03edb4de33fd04c4ea55f47397b96a8657c53 before cd968dcdec6aee79a2d399e4f6e0eca63c3b45e1; 3cb03edb4de33fd04c4ea55f47397b96a8657c53 builds before 0cdc6d5a26f2d1f7f15a43526841b679445c32e2; from 3cb03edb4de33fd04c4ea55f47397b96a8657c53 before 779c60a5190c42689534172f4b49e927c9959e4e; from 6.1.107 before 6.1.188; from 6.6.48 before 6.6.157	CNA record
linux linux_kernel linux:linux_kernel	from 6.1.107 before 6.2; from 6.6.48 before 6.19.4	NVD

References

References

https://git.kernel.org/stable/c/e13194e60217db02c2e7202375d9e5951267d87b
https://git.kernel.org/stable/c/de6601f1374fab124cd9276df6671f64d940ceb4
https://git.kernel.org/stable/c/48cf7918d10c66cb6b05226fa3fa5daf0c891089
https://git.kernel.org/stable/c/cd968dcdec6aee79a2d399e4f6e0eca63c3b45e1
https://git.kernel.org/stable/c/0cdc6d5a26f2d1f7f15a43526841b679445c32e2	patch
https://git.kernel.org/stable/c/779c60a5190c42689534172f4b49e927c9959e4e	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.