PT-2026-51926 · Linux · Linux

Published 2026-06-24 · Updated 2026-06-24 · CVE-2026-53032

Mitre

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.

Related Identifiers

CVE-2026-53032

Affected Products

Linux

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-53032 · Security Note
• https://git.kernel.org/stable/c/520454e839710c327808c2fcc98e28cee77355fc · Note
• https://git.kernel.org/stable/c/6982653ce5f119982aa58f1af58e7bfbebf39252 · Note
• https://git.kernel.org/stable/c/0a36c1f72888bca0237295a4da19cd91821a90be · Note
• https://git.kernel.org/stable/c/da1d615ce49a47986a8864e2371a26e97861085c · Note
• https://git.kernel.org/stable/c/4d0a375887ab4d49e4da1ff10f9606cab8f7c3ad · Note