Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected fd978bf7fd312581a7ca454a991f0ffb34c4204b before cedd4f01f67be94735f15123158f485028571037; affected fd978bf7fd312581a7ca454a991f0ffb34c4204b before 466ce46f251dfb259a8cbaa895ab9edd6fb56240; affected fd978bf7fd312581a7ca454a991f0ffb34c4204b before ae5ccad6c711db0f2ca1231be051935dd128b8f5; affected fd978bf7fd312581a7ca454a991f0ffb34c4204b before f1db20814af532f85e091231223e5e4818e8464b |
| Linux / Linux | affected 4.20; unaffected 0 before 4.20; unaffected 5.10.155 through 5.10.*; unaffected 5.15.79 through 5.15.*; unaffected 6.0.9 through 6.0.*; unaffected 6.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/cedd4f01f67be94735f15123158f485028571037
- https://git.kernel.org/stable/c/466ce46f251dfb259a8cbaa895ab9edd6fb56240
- https://git.kernel.org/stable/c/ae5ccad6c711db0f2ca1231be051935dd128b8f5
- https://git.kernel.org/stable/c/f1db20814af532f85e091231223e5e4818e8464b
ADP enrichment
No English description supplied.
No references supplied.