CVE-2026-45974 btrfs: fix invalid leaf access in btrfs_quota_enable() if ref key not found
A local attacker can cause a kernel crash by triggering an invalid memory access in the btrfs filesystem when enabling quotas.
- 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-2026-45974?
CVE-2026-45974 is a medium-severity vulnerability in Linux kernel, published on 27 May 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:
btrfs: fix invalid leaf access in btrfs_quota_enable() if ref key not found
If btrfs_search_slot_for_read() returns 1, it means we did not find any key greater than or equals to the key we asked for, meaning we have reached the end of the tree and therefore the path is not valid. If this happens we need to break out of the loop and stop, instead of continuing and accessing an invalid path.
Which versions are affected by CVE-2026-45974?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-45974?
Apply the vendor's patch.
Is CVE-2026-45974 being exploited?
There is no known exploitation of CVE-2026-45974 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-45974, DEBIAN-CVE-2026-45974, GHSA-9f93-r4x7-fg5m, ROOT-OS-DEBIAN-11-CVE-2026-45974, ROOT-OS-UBUNTU-2204-CVE-2026-45974, ROOT-OS-UBUNTU-2404-CVE-2026-45974 and 1 more.