CVE-2022-49053 scsi: target: tcmu: Fix possible page UAF
A use-after-free vulnerability in the Linux kernel's tcmu driver allows attackers to potentially execute code or escalate privileges via improper page reference counting.
- 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-2022-49053?
CVE-2022-49053 is a high-severity use after free vulnerability in Linux kernel, published on 26 Feb 2025. 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:
scsi: target: tcmu: Fix possible page UAF
tcmu_try_get_data_page() looks up pages under cmdr_lock, but it does not take refcount properly and just returns page pointer. When tcmu_try_get_data_page() returns, the returned page may have been freed by tcmu_blocks_release().
We need to get_page() under cmdr_lock to avoid concurrent tcmu_blocks_release().
Weakness: CWE-416
Which versions are affected by CVE-2022-49053?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-49053?
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-2022-49053 being exploited?
There is no known exploitation of CVE-2022-49053 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-49053, GHSA-r42x-vw8p-w99g, UBUNTU-CVE-2022-49053.