NULL pointer dereference in Linux kernel - CVE-2026-64141
Published: July 20, 2026
Vulnerability identifier: #VU138505
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-64141
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in compare_guid_key() in fs/smb/server/oplock.c when processing SMB2 CREATE requests with a lease context after session teardown on the same TCP connection. A remote user can send crafted SMB2 session and create requests to cause a denial of service.
Exploitation requires a successful SMB2 SESSION_SETUP and a share configured with durable handles enabled.
How to mitigate CVE-2026-64141
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/0836081b394ca074d1b910f2b990ff7b4b4404c7
- https://git.kernel.org/stable/c/4b83cbc4c15f09b000cc06f033f64b0824b6dc87
- https://git.kernel.org/stable/c/af86896ca3239e25a6bd7d352213371265073d38
- https://git.kernel.org/stable/c/cd5c1b75d2f454f625d7dc55bd3ae21d0855f6ad
- https://git.kernel.org/stable/c/e43cb36d4d7827710cfcd48e95e29a507f0d87be