CVE-2026-64382 smb: client: fix double-free in SMB2_open() replay
A double-free vulnerability in the Linux kernel SMB client allows attackers to cause denial of service or potentially execute code via crafted SMB responses.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-64382?
CVE-2026-64382 is a high-severity use after free vulnerability in Linux kernel, published on 25 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix double-free in SMB2_open() replay
A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_open_init() fails before the next send, cleanup retains the previous buffer type and frees that response again.
Reset response bookkeeping before each attempt to prevent the stale free.
Weakness: CWE-415
Which versions are affected by CVE-2026-64382?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64382?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-64382 being exploited?
There is no known exploitation of CVE-2026-64382 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-93671, BELL-CVE-2026-64382, DEBIAN-CVE-2026-64382, GHSA-9v59-2cj8-p55r, ROOT-OS-UBUNTU-2204-CVE-2026-64382, UBUNTU-CVE-2026-64382.