A vulnerability in the Linux kernel's netfilter nft_counter component was addressed by adding a global static spinlock to serialize counter fetch… (CVE-2026-45897)
A vulnerability in the Linux kernel's netfilter nft_counter component was addressed by adding a global static spinlock to serialize counter fetch and reset operations. This prevents concurrent dump-and-reset operations from causing counter value underruns. The fix involves taking a global lock before fetching the total counter value to avoid race conditions between parallel resets. The vulnerability affects version 3.0 of the product.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel's netfilter nft_counter arises from a lack of synchronization during counter fetch and reset operations, which can lead to underrunning counter values when concurrent resets occur. The resolution adds a global static spinlock to serialize these operations, ensuring that two parallel resets do not read and subtract the same counter values simultaneously. This global lock is a simple solution given the infrequency of resets, with the possibility of a more granular lock if performance bottlenecks arise.
Potential Impact
The vulnerability can cause availability issues (denial of service) due to incorrect counter values resulting from concurrent resets. There is no impact on confidentiality or integrity. No known exploits are reported in the wild.
Mitigation Recommendations
A fix is available that adds a global static spinlock to serialize counter fetch and reset operations, preventing concurrent underruns. Users should apply the official patch or update to the fixed version. Since this is a kernel-level fix, upgrading the affected Linux kernel version to the patched release is recommended.
A vulnerability in the Linux kernel's netfilter nft_counter component was addressed by adding a global static spinlock to serialize counter fetch… (CVE-2026-45897)
Description
A vulnerability in the Linux kernel's netfilter nft_counter component was addressed by adding a global static spinlock to serialize counter fetch and reset operations. This prevents concurrent dump-and-reset operations from causing counter value underruns. The fix involves taking a global lock before fetching the total counter value to avoid race conditions between parallel resets. The vulnerability affects version 3.0 of the product.
CVSS v3.1
Score 5.5medium
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in the Linux kernel's netfilter nft_counter arises from a lack of synchronization during counter fetch and reset operations, which can lead to underrunning counter values when concurrent resets occur. The resolution adds a global static spinlock to serialize these operations, ensuring that two parallel resets do not read and subtract the same counter values simultaneously. This global lock is a simple solution given the infrequency of resets, with the possibility of a more granular lock if performance bottlenecks arise.
Potential Impact
The vulnerability can cause availability issues (denial of service) due to incorrect counter values resulting from concurrent resets. There is no impact on confidentiality or integrity. No known exploits are reported in the wild.
Mitigation Recommendations
A fix is available that adds a global static spinlock to serialize counter fetch and reset operations, preventing concurrent underruns. Users should apply the official patch or update to the fixed version. Since this is a kernel-level fix, upgrading the affected Linux kernel version to the patched release is recommended.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_vex
- Csaf Version
- 2.0
- Publisher
- Microsoft Security Response Center
- Advisory Id
- msrc_CVE-2026-45897
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- 3.1
Threat ID: 6a18ab8ae29bf47b5028911a
Added to database: 05/28/2026, 20:54:34 UTC
Last enriched: 06/26/2026, 23:38:53 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 29
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