Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix NULL deref in map_kptr_match_type for scalar regs Commit ab6c637ad027 ("bpf: Fix a bpf_kptr_xchg() issue with local kptr") refactored map_kptr_match_type() to branch on btf_is_kernel() before checking base_type(). A scalar register stored into a kptr slot has no btf, so the btf_is_kernel(reg->btf) call dereferences NULL. Move the base_type() != PTR_TO_BTF_ID guard before any reg->btf access.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ab6c637ad0276e42f8acabcbc64932a6d346dab3 before 520454e839710c327808c2fcc98e28cee77355fc; affected ab6c637ad0276e42f8acabcbc64932a6d346dab3 before 0a36c1f72888bca0237295a4da19cd91821a90be; affected ab6c637ad0276e42f8acabcbc64932a6d346dab3 before 6982653ce5f119982aa58f1af58e7bfbebf39252; affected ab6c637ad0276e42f8acabcbc64932a6d346dab3 before da1d615ce49a47986a8864e2371a26e97861085c; affected ab6c637ad0276e42f8acabcbc64932a6d346dab3 before 4d0a375887ab4d49e4da1ff10f9606cab8f7c3ad; affected af3d2e0f3a54e67806959d161e613457772babc5; affected 4782968e0d631b0d8944dcfd4bf8fb49be087101; affected 6.4.16 before 6.5; affected 6.5.3 before 6.6 |
| Linux / Linux | affected 6.6; unaffected 0 before 6.6; unaffected 6.6.141 through 6.6.*; unaffected 6.12.91 through 6.12.*; unaffected 6.18.33 through 6.18.*; unaffected 7.0.10 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/520454e839710c327808c2fcc98e28cee77355fc
- https://git.kernel.org/stable/c/0a36c1f72888bca0237295a4da19cd91821a90be
- https://git.kernel.org/stable/c/6982653ce5f119982aa58f1af58e7bfbebf39252
- https://git.kernel.org/stable/c/da1d615ce49a47986a8864e2371a26e97861085c
- https://git.kernel.org/stable/c/4d0a375887ab4d49e4da1ff10f9606cab8f7c3ad