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Advisory severityMedium5.5Red Hat Linux

Medium [CVE-2026-53032] Fix NULL deref in map_kptr_match_type for scalar regs

This medium-severity Red Hat Linux advisory covers CVE-2026-53032 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-53032 Source published Source updated

VulniPulse record published Record updated

CVE-2026-53032
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

Summary

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 flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) subsystem. This vulnerability occurs in the map_kptr_match_type function when a scalar register is stored into a kernel pointer (kptr) slot.

Due to an incorrect order of checks, the system attempts to access a null pointer, specifically a BPF Type Format (BTF) definition that does not exist for scalar registers. This null pointer dereference can lead to a system crash, resulting in a Denial of Service (DoS).

Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-476.

Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9. Red Hat does not currently list a fixing RHSA for this CVE.

Affected products named by the advisory: Red Hat package: kernel-rt.

Is CVE-2026-53032 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-53032 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-53032?

The advisory VulniPulse tracks names no fixed release. Follow Red Hat's guidance for workarounds and updates.

Confirm against the vendor advisory before you patch.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · medium-confidence parse· fetched 14 days ago·verify at source

Fixed versions

No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.

Official advisory · medium-confidence parse· fetched 14 days ago·verify at source

Mitigation

The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.

Official advisory · medium-confidence parse· fetched 14 days ago·verify at source

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