CVE-2026-53032 Details
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.
A vulnerability in the Linux kernel's BPF subsystem allows for a NULL pointer dereference in the function 'map_kptr_match_type'. This issue arises when scalar registers are stored in kernel pointer slots, as these registers lack BTF (Berkeley Type Format) information. The vulnerability was introduced in a previous commit that altered the function's logic, leading to the NULL dereference. The issue has been addressed by reordering the checks in the function to prevent the dereference.
Users can upgrade to the patched version of the Linux kernel available in the Linux kernel stable tree.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/0a36c1f72888bca0237295a4da19cd91821a90be | kernel.org | Patch |
| https://git.kernel.org/stable/c/4d0a375887ab4d49e4da1ff10f9606cab8f7c3ad | kernel.org | Patch |
| https://git.kernel.org/stable/c/520454e839710c327808c2fcc98e28cee77355fc | kernel.org | Patch |
| https://git.kernel.org/stable/c/6982653ce5f119982aa58f1af58e7bfbebf39252 | kernel.org | Patch |
| https://git.kernel.org/stable/c/da1d615ce49a47986a8864e2371a26e97861085c | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.4.16, < 6.5 >= 6.5.3, < 6.6.141 >= 6.7, < 6.12.91 >= 6.13, < 6.18.33 >= 6.19, < 7.0.10 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 14, 2026 | Initial Analysis | [email protected] |
| Jun 24, 2026 | New CVE Received | kernel.org |