Double free in Linux kernel - CVE-2026-64386
Published: July 27, 2026
Vulnerability identifier: #VU139590
CSH Severity: Medium
CVSS v4: 7.1 [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]
CVE-ID: CVE-2026-64386
CWE-ID: CWE-415
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to a double free in query_info() in the smb client when handling replayable query_info requests. A remote user can trigger a replayable error sequence to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-64386
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/100fb7c455fa86d248b8bd7bb9de757c192870b4
- https://git.kernel.org/stable/c/2a88561d66eb855813cf004a0abe648bbb17de5e
- https://git.kernel.org/stable/c/3c81dda84799f76b42aec598564316e2964440db
- https://git.kernel.org/stable/c/89234773e8348918111aa15f6922b58cf3843364
- https://git.kernel.org/stable/c/f1add4acb656f5a82806a1ab0e63fed3d8b1bfca