CVE-2026-53272 erofs: fix use-after-free on sbi->sync_decompress
A race condition in the Linux kernel's EROFS filesystem allows a use-after-free, potentially enabling local attackers to execute code or escalate privileges.
- 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-2026-53272?
CVE-2026-53272 is a high-severity use after free vulnerability in Linux kernel, published on 25 Jun 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:
erofs: fix use-after-free on sbi->sync_decompress
z_erofs_decompress_kickoff() can race with filesystem unmount, causing a use-after-free on sbi->sync_decompress.
When I/O completes, z_erofs_endio() calls z_erofs_decompress_kickoff() to queue z_erofs_decompressqueue_work() asynchronously. Then, after all folios are unlocked, unmount workflow can proceed and sbi will be freed before accessing to sbi->sync_decompress.
Thread (unmount) I/O completion kworker queue_work z_erofs_decompressqueue_work (all folios are unlocked) cleanup_mnt .. erofs_kill_sb erofs_sb_free kfree(sbi) access sbi->sync_decompress // UAF!!
Weakness: CWE-416
Which versions are affected by CVE-2026-53272?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53272?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-53272 being exploited?
There is no known exploitation of CVE-2026-53272 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-90506, BELL-CVE-2026-53272, DEBIAN-CVE-2026-53272, GHSA-pc3h-m9mc-v77g, ROOT-OS-DEBIAN-12-CVE-2026-53272, ROOT-OS-UBUNTU-2404-CVE-2026-53272 and 1 more.