Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.4.16, < 6.5 |
Related Weaknesses (CWE)
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
FAQ
What is CVE-2026-53032?
CVE-2026-53032 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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"...
How severe is CVE-2026-53032?
CVE-2026-53032 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-53032?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.