CVE-2026-68343 smb: client: validate DFS referral PathConsumed
A malformed SMB DFS referral response can cause out-of-bounds memory access in the Linux kernel, potentially leading to crashes or code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68343?
CVE-2026-68343 is a critical memory corruption vulnerability in Linux, published on 10 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: validate DFS referral PathConsumed
parse_dfs_referrals() validates that the response contains the fixed referral entry array and, on for-next, the per-referral string offsets. However, the response also contains a PathConsumed value that is later used for DFS path parsing.
If a malformed response provides a PathConsumed value larger than the search name, later DFS parsing can advance beyond the end of the path.
Validate PathConsumed against the search name length before storing it in the parsed referral.
Weakness: CWE-125
Which versions are affected by CVE-2026-68343?
How do I fix CVE-2026-68343?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-68343 being exploited?
There is no known exploitation of CVE-2026-68343 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68343, DEBIAN-CVE-2026-68343, GHSA-jv66-q3cr-4688, UBUNTU-CVE-2026-68343.