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

Status: published. Published: 2026-05-27. Updated: 2026-11-06.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ fb1adb05ea87b6149e65a31e511756c4f470d0cd; < e13194e60217db02c2e7202375d9e5951267d87b (affected, git); ≥ f123293db16dcd0cd81b246ae60e6362f0025d0a; < de6601f1374fab124cd9276df6671f64d940ceb4 (affected, git); ≥ 3cb03edb4de33fd04c4ea55f47397b96a8657c53; < 48cf7918d10c66cb6b05226fa3fa5daf0c891089 (affected, git); ≥ 3cb03edb4de33fd04c4ea55f47397b96a8657c53; < cd968dcdec6aee79a2d399e4f6e0eca63c3b45e1 (affected, git); ≥ 3cb03edb4de33fd04c4ea55f47397b96a8657c53; < 0cdc6d5a26f2d1f7f15a43526841b679445c32e2 (affected, git); ≥ 3cb03edb4de33fd04c4ea55f47397b96a8657c53; < 779c60a5190c42689534172f4b49e927c9959e4e (affected, git); ≥ 6.1.107; < 6.1.188 (affected, semver); ≥ 6.6.48; < 6.6.157 (affected, semver). Source: CNA: Linux
- Linux / Linux: 6.7 (affected); ≥ 0; < 6.7 (unaffected, semver); ≥ 6.1.188; ≤ 6.1.* (unaffected, semver); ≥ 6.6.157; ≤ 6.6.* (unaffected, semver); ≥ 6.12.101; ≤ 6.12.* (unaffected, semver); ≥ 6.18.42; ≤ 6.18.* (unaffected, semver); ≥ 6.19.4; ≤ 6.19.* (unaffected, semver); ≥ 7.0; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.16% as of 2026-11-06; percentile 5.27%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/e13194e60217db02c2e7202375d9e5951267d87b (CNA: Linux)

- https://git.kernel.org/stable/c/de6601f1374fab124cd9276df6671f64d940ceb4 (CNA: Linux)

- https://git.kernel.org/stable/c/48cf7918d10c66cb6b05226fa3fa5daf0c891089 (CNA: Linux)

- https://git.kernel.org/stable/c/cd968dcdec6aee79a2d399e4f6e0eca63c3b45e1 (CNA: Linux)

- https://git.kernel.org/stable/c/0cdc6d5a26f2d1f7f15a43526841b679445c32e2 (CNA: Linux)

- https://git.kernel.org/stable/c/779c60a5190c42689534172f4b49e927c9959e4e (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-45897; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-45897; retrieved 2026-11-06; source updated Not reported

Revision: 9240800d70f781cc45a4add339e57fe0c5d64aebd3dce9cdc04ff2ea95fff278

Canonical: https://y2.dev/cve/CVE-2026-45897

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Collected public records only. Check source status for coverage and freshness.