Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.20, < 5.10.155 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/466ce46f251dfb259a8cbaa895ab9edd6fb56240Patch
- https://git.kernel.org/stable/c/ae5ccad6c711db0f2ca1231be051935dd128b8f5Patch
- https://git.kernel.org/stable/c/cedd4f01f67be94735f15123158f485028571037Patch
- https://git.kernel.org/stable/c/f1db20814af532f85e091231223e5e4818e8464bPatch
FAQ
What is CVE-2022-49873?
CVE-2022-49873 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 v...
How severe is CVE-2022-49873?
CVE-2022-49873 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-49873?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.