CVE-2022-49651 srcu: Tighten cleanup_srcu_struct() GP checks
A use-after-free vulnerability in the Linux kernel's SRCU cleanup allows attackers to potentially 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-2022-49651?
CVE-2022-49651 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:
srcu: Tighten cleanup_srcu_struct() GP checks
Currently, cleanup_srcu_struct() checks for a grace period in progress, but it does not check for a grace period that has not yet started but which might start at any time. Such a situation could result in a use-after-free bug, so this commit adds a check for a grace period that is needed but not yet started to cleanup_srcu_struct().
Weakness: CWE-416
Which versions are affected by CVE-2022-49651?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-49651?
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-2022-49651 being exploited?
There is no known exploitation of CVE-2022-49651 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-58971, DEBIAN-CVE-2022-49651, GHSA-jc9r-g3mj-xmwh, ROOT-OS-DEBIAN-11-CVE-2022-49651, ROOT-OS-UBUNTU-2204-CVE-2022-49651, UBUNTU-CVE-2022-49651.