CVE-2026-53032
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.
Metadata
Severity & Metrics
No CVSS data available.
Affected products (2)
| Vendor | Product | Platform | Versions |
|---|---|---|---|
| Linux | Linux | — | ab6c637ad0276e42f8acabcbc64932a6d346dab3 < 520454e839710c327808c2fcc98e28cee77355fc, ab6c637ad0276e42f8acabcbc64932a6d346dab3 < 0a36c1f72888bca0237295a4da19cd91821a90be, ab6c637ad0276e42f8acabcbc64932a6d346dab3 < 6982653ce5f119982aa58f1af58e7bfbebf39252, ab6c637ad0276e42f8acabcbc64932a6d346dab3 < da1d615ce49a47986a8864e2371a26e97861085c … |
| Linux | Linux | — | 6.6, 0 < 6.6, 6.6.141 ≤ 6.6.*, 6.12.91 ≤ 6.12.* … |
References (5)
- 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