Description
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 products
- Linux / Linuxab6c637ad0276e42f8acabcbc64932a6d346dab3 – 520454e839710c327808c2fcc98e28cee77355fc
- Linux / Linuxab6c637ad0276e42f8acabcbc64932a6d346dab3 – 0a36c1f72888bca0237295a4da19cd91821a90be
- Linux / Linuxab6c637ad0276e42f8acabcbc64932a6d346dab3 – 6982653ce5f119982aa58f1af58e7bfbebf39252
- Linux / Linuxab6c637ad0276e42f8acabcbc64932a6d346dab3 – da1d615ce49a47986a8864e2371a26e97861085c
- Linux / Linuxab6c637ad0276e42f8acabcbc64932a6d346dab3 – 4d0a375887ab4d49e4da1ff10f9606cab8f7c3ad
- Linux / Linuxaf3d2e0f3a54e67806959d161e613457772babc5 – af3d2e0f3a54e67806959d161e613457772babc5
- Linux / Linux4782968e0d631b0d8944dcfd4bf8fb49be087101 – 4782968e0d631b0d8944dcfd4bf8fb49be087101
- Linux / Linux6.4.16 – 6.5
- Linux / Linux6.5.3 – 6.6
- Linux / Linux6.6 – 6.6
- Linux / Linux0 – 6.6
- Linux / Linux6.6.141 – 6.6.*
- Linux / Linux6.12.91 – 6.12.*
- Linux / Linux6.18.33 – 6.18.*
- Linux / Linux7.0.10 – 7.0.*
- Linux / Linux7.1 – *
References
- MISChttps://git.kernel.org/stable/c/520454e839710c327808c2fcc98e28cee77355fc
- MISChttps://git.kernel.org/stable/c/0a36c1f72888bca0237295a4da19cd91821a90be
- MISChttps://git.kernel.org/stable/c/6982653ce5f119982aa58f1af58e7bfbebf39252
- MISChttps://git.kernel.org/stable/c/da1d615ce49a47986a8864e2371a26e97861085c
- MISChttps://git.kernel.org/stable/c/4d0a375887ab4d49e4da1ff10f9606cab8f7c3ad