CVE-2026-53026
published 2026-06-24CVE-2026-53026: In the Linux kernel, the following vulnerability has been resolved: NFSD: fix nfs4_file access extra count in nfsd4_add_rdaccess_to_wrdeleg In…
PriorityP341high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.43%
35.0th percentile
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.
Affected
14 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 6.18.4 < 6.18.33 | 6.18.33 |
| linux | linux | >= 8072e34e1387d03102b788677d491e2bcceef6f5 < b81572b073441dfd32213e41857676d0dbff4665 | b81572b073441dfd32213e41857676d0dbff4665 |
| linux | linux | >= 8072e34e1387d03102b788677d491e2bcceef6f5 < b48f44f36e6607b2f818560f19deb86b4a9c717b | b48f44f36e6607b2f818560f19deb86b4a9c717b |
| linux | linux | >= c07dc84ed67c5a182273171639bacbbb87c12175 < 4584229395d0d65bd517780afe97ffea07cb2c3d | 4584229395d0d65bd517780afe97ffea07cb2c3d |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 6.18.4 < 6.18.33 | 6.18.33 |
| linux | linux_kernel | >= 6.19.1 < 7.0.10 | 7.0.10 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vendor_redhat7.0MEDIUM
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Red Hat
kernel: NFSD: fix nfs4_file access extra count in nfsd4_add_rdaccess_to_wrdeleg
vendor_redhat·2026-06-24·CVSS 7.0
CVE-2026-53026 [MEDIUM] CWE-911 kernel: NFSD: fix nfs4_file access extra count in nfsd4_add_rdaccess_to_wrdeleg
kernel: NFSD: fix nfs4_file access extra count in nfsd4_add_rdaccess_to_wrdeleg
A flaw was found in the Linux kernel's Network File System Daemon (NFSD). An issue with file access counting in the nfsd4_add_rdaccess_to_wrdeleg function can lead to an extra access count for nfs4_file objects. This prevents the proper freeing of associated resources when the NFS server service is stopped. Consequently, this can trigger a system bug during shutdown, potentially leading to a Denial of Service (DoS) condition.
Package: kernel (Red Hat Enterprise Linux 10) - Affected
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Not affected
Package: kernel-rt (Red Hat Enterprise Linux 7) - Not affected
Package: kernel (Red Hat Enterprise Linux 8)
GHSA
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]
ghsa_unreviewed·2026-06-24
CVE-2026-53026 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]
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.
No detection rules found.
No public exploits indexed.
2026-06-24
Published