vulnerability
Ubuntu: (CVE-2022-49873): linux vulnerability
Severity | CVSS | Published | Added | Modified |
---|---|---|---|---|
6 | (AV:L/AC:L/Au:S/C:C/I:N/A:C) | May 1, 2025 | May 8, 2025 | Jun 10, 2025 |
Description
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix wrong reg type conversion in release_reference()
Some helper functions will allocate memory. To avoid memory leaks, the
verifier requires the eBPF program to release these memories by calling
the corresponding helper functions.
When a resource is released, all pointer registers corresponding to the
resource should be invalidated. The verifier use release_references() to
do this job, by apply __mark_reg_unknown() to each relevant register.
It will give these registers the type of SCALAR_VALUE. A register that
will contain a pointer value at runtime, but of type SCALAR_VALUE, which
may allow the unprivileged user to get a kernel pointer by storing this
register into a map.
Using __mark_reg_not_init() while NOT allow_ptr_leaks can mitigate this
problem.
Solution(s)
References
- CVE-2022-49873
- https://attackerkb.com/topics/CVE-2022-49873
- URL-https://git.kernel.org/linus/f1db20814af532f85e091231223e5e4818e8464b
- URL-https://git.kernel.org/stable/c/466ce46f251dfb259a8cbaa895ab9edd6fb56240
- URL-https://git.kernel.org/stable/c/ae5ccad6c711db0f2ca1231be051935dd128b8f5
- URL-https://git.kernel.org/stable/c/cedd4f01f67be94735f15123158f485028571037
- URL-https://git.kernel.org/stable/c/f1db20814af532f85e091231223e5e4818e8464b
- URL-https://www.cve.org/CVERecord?id=CVE-2022-49873

Explore Exposure Command
Confidently identify and prioritize exposures from endpoint to cloud with full attack surface visibility and threat-aware risk context.