Medium 5.5Published Jun 24, 2026

CVE-2026-53032bpf: Fix NULL deref in map_kptr_match_type for scalar regs

Updated under an hour ago (Oct 28, 2026, 7:10 AM ET)

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Exploited in the last 30 days

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: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Jun 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from ab6c637ad0276e42f8acabcbc64932a6d346dab3 before 520454e839710c327808c2fcc98e28cee77355fc; from ab6c637ad0276e42f8acabcbc64932a6d346dab3 before 0a36c1f72888bca0237295a4da19cd91821a90be; from ab6c637ad0276e42f8acabcbc64932a6d346dab3 before 6982653ce5f119982aa58f1af58e7bfbebf39252; from ab6c637ad0276e42f8acabcbc64932a6d346dab3 before da1d615ce49a47986a8864e2371a26e97861085c; from ab6c637ad0276e42f8acabcbc64932a6d346dab3 before 4d0a375887ab4d49e4da1ff10f9606cab8f7c3ad; af3d2e0f3a54e67806959d161e613457772babc5; 4782968e0d631b0d8944dcfd4bf8fb49be087101; from 6.4.16 before 6.5; and 1 more ranges	CNA record
linux linux_kernel linux:linux_kernel	from 6.4.16 before 6.5; from 6.5.3 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10	NVD

References

References

https://git.kernel.org/stable/c/520454e839710c327808c2fcc98e28cee77355fc	patch
https://git.kernel.org/stable/c/0a36c1f72888bca0237295a4da19cd91821a90be	patch
https://git.kernel.org/stable/c/6982653ce5f119982aa58f1af58e7bfbebf39252	patch
https://git.kernel.org/stable/c/da1d615ce49a47986a8864e2371a26e97861085c	patch
https://git.kernel.org/stable/c/4d0a375887ab4d49e4da1ff10f9606cab8f7c3ad	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.