Total vulnerabilities in the database
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.
| Software | From | Fixed in |
|---|---|---|
| linux / linux_kernel | 6.1-rc2 | 6.1-rc2.x |
| linux / linux_kernel | 6.1-rc1 | 6.1-rc1.x |
| linux / linux_kernel | 6.1-rc3 | 6.1-rc3.x |
| linux / linux_kernel | 6.1-rc4 | 6.1-rc4.x |
| linux / linux_kernel | 5.11 | 5.15.79 |
| linux / linux_kernel | 5.16 | 6.0.9 |
| linux / linux_kernel | 4.20 | 5.10.155 |