CVE-2026-53032
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…
Does this matter?
Lower severity and a low EPSS score (0.12%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.12% probability · 2th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0a36c1f72888bca0237295a4da19cd91821a90bePatch
- https://git.kernel.org/stable/c/4d0a375887ab4d49e4da1ff10f9606cab8f7c3adPatch
- https://git.kernel.org/stable/c/520454e839710c327808c2fcc98e28cee77355fcPatch
- https://git.kernel.org/stable/c/6982653ce5f119982aa58f1af58e7bfbebf39252Patch
- https://git.kernel.org/stable/c/da1d615ce49a47986a8864e2371a26e97861085cPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.