CVE-2026-80533 xfs: don't walk off the end of a null sc->sa.agi_bp in AGI repair
A null pointer dereference in the Linux kernel XFS AGI repair code can cause a system crash, requiring local administrative access to trigger.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80533?
CVE-2026-80533 is a vulnerability in Linux, published on 26 Aug 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:
xfs: don't walk off the end of a null sc->sa.agi_bp in AGI repair
LOLLM noticed a longstanding bug where xrep_iunlink_walk_ondisk_bucket tries to walk ragi->sc->sa.agi_bp to rebuild the unlinked inode lists. Unfortunately, it's possible for agi_bp to be null if the buffer verifier fails, so we have to use ragi->agi_bp (which skips verifier checks) instead.
Which versions are affected by CVE-2026-80533?
How do I fix CVE-2026-80533?
Apply the vendor's patch.
Is CVE-2026-80533 being exploited?
There is no known exploitation of CVE-2026-80533 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80533, DEBIAN-CVE-2026-80533, UBUNTU-CVE-2026-80533.