CVE-2026-53026 Details
Description
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.
A vulnerability exists in the Linux kernel's NFS server component (NFSD) related to improper management of file access counts in NFSv4 delegation handling. Specifically, in the function 'nfsd4_add_rdaccess_to_wrdeleg', an extra access count can be inadvertently added if a file descriptor for read access is already set by another thread. This unnecessary increment can lead to a reference leak, preventing the corresponding NFS file object from being properly freed. When the NFS server is stopped, these leaked references can cause a bug in the memory cache destruction process, leaving behind residual NFS file objects. This issue can be reproduced by running the Git project's test suite over NFS.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been addressed. The specific commit that resolves this issue is available in the Linux kernel stable tree.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/4584229395d0d65bd517780afe97ffea07cb2c3d | kernel.org | Patch |
| https://git.kernel.org/stable/c/b48f44f36e6607b2f818560f19deb86b4a9c717b | kernel.org | Patch |
| https://git.kernel.org/stable/c/b81572b073441dfd32213e41857676d0dbff4665 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.18.4, < 6.18.33 >= 6.19.1, < 7.0.10 6.19 - 6.19 rc4 6.19 rc5 6.19 rc6 6.19 rc7 6.19 rc8 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 15, 2026 | Initial Analysis | [email protected] |
| Jun 28, 2026 | CVE Modified | kernel.org |
| Jun 24, 2026 | New CVE Received | kernel.org |