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PatchSiren cyber security CVE debrief

CVE-2026-64150 Linux CVE debrief

The Linux kernel has a vulnerability that has been resolved in netfilter: nft_inner: release local_lock before re-enabling softirqs. In the error path, local_bh_enable() is called before local_unlock_nested_bh(). This vulnerability affects Linux kernel users and administrators, who should review their systems for potential impact. The issue involves the nft_inner module, where a local_lock is not released before re-enabling softirqs in the error path. This could potentially lead to a deadlock or other synchronization issues.

Vendor
Linux
Product
Unknown
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-19
Original CVE updated
2026-08-17
Advisory published
2026-07-19
Advisory updated
2026-08-17

Who should care

Linux kernel users and administrators should review their systems for potential impact. They should ensure systems are updated with the latest kernel patches and monitor system logs for unusual activity related to netfilter and softirqs.

Technical summary

A vulnerability in the Linux kernel's netfilter component has been addressed. The issue involves the nft_inner module, where a local_lock is not released before re-enabling softirqs in the error path. This could potentially lead to a deadlock or other synchronization issues. Linux kernel users and administrators should review their systems for potential impact and ensure systems are updated with the latest kernel patches.

Defensive priority

Medium

Recommended defensive actions

  • Review Linux kernel configurations and versions for potential impact
  • Ensure systems are updated with the latest kernel patches
  • Monitor system logs for unusual activity related to netfilter and softirqs
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-19T16:17:56.970Z and has not been modified since then. The NVD entry is currently Received. There is limited evidence available, and defenders should verify the affected scope and severity with the official CVE record and vendor guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-64150 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-64150

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-64150 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-64150

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/6fecd39c6401134b58505bc4eb1adc8a0e2fe992

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/a6cb3ff979855f7f0ee9450a947fe8f96c2ba37a

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/df19b6af171695a1352314597c9a4311d48d5171

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.