Memory leak in Linux kernel - CVE-2026-53395
Published: July 21, 2026
Vulnerability identifier: #VU138872
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-53395
CWE-ID: CWE-401
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a memory leak in nfsd4_create in the NFS server when processing a CREATE request with both FATTR4_WORD0_ACL and FATTR4_WORD2_POSIX_DEFAULT_ACL or FATTR4_WORD2_POSIX_ACCESS_ACL encoded in the same fattr bitmap. A remote attacker can send repeated specially crafted CREATE requests to cause a denial of service.
The issue leaks two posix_acl slab objects per request, which can lead to unbounded slab exhaustion.
Affected software
Linux kernel
How to mitigate CVE-2026-53395
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3