CVE-2026-31693 cifs: some missing initializations on replay
Missing variable initializations in the Linux kernel CIFS module during request replays could lead to undefined behavior or logic errors.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-31693?
CVE-2026-31693 is a high-severity vulnerability in Linux kernel, published on 30 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
cifs: some missing initializations on replay
In several places in the code, we have a label to signify the start of the code where a request can be replayed if necessary. However, some of these places were missing the necessary reinitializations of certain local variables before replay.
This change makes sure that these variables get initialized after the label.
Which versions are affected by CVE-2026-31693?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31693?
Apply the vendor's patch.
Is CVE-2026-31693 being exploited?
There is no known exploitation of CVE-2026-31693 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-31693, DEBIAN-CVE-2026-31693, GHSA-v5v4-gvc3-q8x8, ROOT-OS-UBUNTU-2204-CVE-2026-31693, ROOT-OS-UBUNTU-2404-CVE-2026-31693, UBUNTU-CVE-2026-31693.