CVE-2026-53395 Linux CVE debrief

Who should care

Linux kernel users and administrators, as well as operators, platforms, vulnerability-management teams, and security teams, should be aware of this vulnerability and ensure their systems are updated.

Technical summary

The vulnerability is in the Linux kernel's nfsd4_create() function. When a client encodes both FATTR4_WORD0_ACL and FATTR4_WORD2_POSIX_{DEFAULT,ACCESS}_ACL in the same CREATE fattr bitmap, nfsd4_acl_to_attr() overwrites attrs.na_pacl/na_dpacl without releasing the originals, leading to a memory leak. This issue can cause slab exhaustion and should be addressed by updating the Linux kernel to the latest version.

Defensive priority

Medium

Recommended defensive actions

• Update Linux kernel to the latest version
• Review and apply patches for nfsd4_create() function
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• 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.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Evidence notes

The CVE record was published on 2026-07-19T12:16:50.597Z and has not been modified since then. The NVD entry is currently Received. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the official advisory or CVE record.

Sources and references

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.