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CVE-2026-53026

Updated on 24 Jun 2026

Severity

7.5 High severity

Details

CVSS score
7.5
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

In the Linux kernel, the following vulnerability has been resolved:

NFSD: fix nfs4_file access extra count in nfsd4_add_rdaccess_to_wrdeleg

In nfsd4_add_rdaccess_to_wrdeleg, if fp->fi_fds[O_RDONLY] is already set by another thread, __nfs4_file_get_access should not be called to increment the nfs4_file access count since that was already done by the thread that added READ access to the file. The extra fi_access count in nfs4_file can prevent the corresponding nfsd_file from being freed.

When stopping nfs-server service, these extra access counts trigger a BUG in kmem_cache_destroy() that shows nfsd_file object remaining on __kmem_cache_shutdown.

This problem can be reproduced by running the Git project’s test suite over NFS.

Details

KernelCare state

Live-patch status from KernelCare for each operating system.

Operating system Status Covered kernels
AlmaLinux 10 In Rollout
24 kernels
  • 6.12.0-211.7.1.el10_2
  • 6.12.0-211.7.3.el10_2
  • 6.12.0-211.20.1.el10_2
  • 6.12.0-211.18.1.el10_2
  • 6.12.0-211.16.1.el10_2
  • 6.12.0-211.22.1.el10_2
  • 6.12.0-211.26.1.el10_2
  • 6.12.0-211.28.1.el10_2
  • 6.12.0-211.29.1.el10_2
  • 6.12.0-211.30.1.el10_2
  • 6.12.0-211.31.1.el10_2
  • 6.12.0-211.32.1.el10_2
  • 6.12.0-211.7.4.el10_2
  • 6.12.0-211.33.1.el10_2
  • 6.12.0-211.34.1.el10_2
  • 6.12.0-211.37.1.el10_2
  • 6.12.0-211.38.1.el10_2
  • 6.12.0-211.39.1.el10_2
  • 6.12.0-211.40.1.el10_2
  • 6.12.0-211.43.1.el10_2
  • 6.12.0-211.44.1.el10_2
  • 6.12.0-211.46.1.el10_2
  • 6.12.0-211.47.1.el10_2
  • 6.12.0-211.49.1.el10_2
Oracle Linux 10 In Rollout
12 kernels
  • 6.12.0-211.7.3.el10_2
  • 6.12.0-211.34.1.el10_2
  • 6.12.0-211.37.1.el10_2
  • 6.12.0-211.38.1.el10_2
  • 6.12.0-211.39.1.el10_2
  • 6.12.0-211.40.1.el10_2
  • 6.12.0-211.42.1.el10_2
  • 6.12.0-211.43.1.el10_2
  • 6.12.0-211.44.1.el10_2
  • 6.12.0-211.46.1.el10_2
  • 6.12.0-211.47.1.el10_2
  • 6.12.0-211.49.1.el10_2
RHEL 10 In Rollout
24 kernels
  • 6.12.0-211.16.1.el10_2
  • 6.12.0-211.7.1.el10_2
  • 6.12.0-211.7.3.el10_2
  • 6.12.0-211.18.1.el10_2
  • 6.12.0-211.20.1.el10_2
  • 6.12.0-211.22.1.el10_2
  • 6.12.0-211.26.1.el10_2
  • 6.12.0-211.28.1.el10_2
  • 6.12.0-211.29.1.el10_2
  • 6.12.0-211.30.1.el10_2
  • 6.12.0-211.31.1.el10_2
  • 6.12.0-211.32.1.el10_2
  • 6.12.0-211.33.1.el10_2
  • 6.12.0-211.34.1.el10_2
  • 6.12.0-211.37.1.el10_2
  • 6.12.0-211.38.1.el10_2
  • 6.12.0-211.39.1.el10_2
  • 6.12.0-211.40.1.el10_2
  • 6.12.0-211.42.1.el10_2
  • 6.12.0-211.43.1.el10_2
  • 6.12.0-211.44.1.el10_2
  • 6.12.0-211.46.1.el10_2
  • 6.12.0-211.47.1.el10_2
  • 6.12.0-211.49.1.el10_2
Rocky Linux 10 In Rollout
17 kernels
  • 6.12.0-211.18.1.el10_2
  • 6.12.0-211.22.1.el10_2
  • 6.12.0-211.26.1.el10_2
  • 6.12.0-211.28.1.el10_2
  • 6.12.0-211.32.1.el10_2
  • 6.12.0-211.16.1.el10_2.0.1
  • 6.12.0-211.33.1.el10_2
  • 6.12.0-211.34.1.el10_2
  • 6.12.0-211.37.1.el10_2
  • 6.12.0-211.39.1.el10_2
  • 6.12.0-211.40.1.el10_2
  • 6.12.0-211.42.1.el10_2
  • 6.12.0-211.43.1.el10_2
  • 6.12.0-211.44.1.el10_2
  • 6.12.0-211.46.1.el10_2
  • 6.12.0-211.47.1.el10_2
  • 6.12.0-211.49.1.el10_2