CVE-2026-89719 zram: fix out-of-bounds access in read_block_state()
A race condition in the Linux kernel zram driver allows out-of-bounds memory access, potentially leading to system crashes or code execution.
- 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-2026-89719?
CVE-2026-89719 is a memory corruption vulnerability in Linux, published on 11 Sep 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:
zram: fix out-of-bounds access in read_block_state()
read_block_state() calculates nr_pages before taking dev_lock. If the device is reset and reinitialized with a smaller disksize before lock acquisition, nr_pages still describes the old table. The subsequent loop can then call slot_lock() past the end of the newly allocated table.
Read disksize after acquiring dev_lock and checking that the device is initialized. The read lock then keeps the table and its bound stable for the duration of the scan.
Which versions are affected by CVE-2026-89719?
How do I fix CVE-2026-89719?
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-2026-89719 being exploited?
There is no known exploitation of CVE-2026-89719 in the wild and no public exploit code.
Sources
Also known as AZL-100860, BELL-CVE-2026-89719, DEBIAN-CVE-2026-89719, GHSA-5pfc-pqwh-23px, UBUNTU-CVE-2026-89719.