Bug 2492400 (CVE-2026-53032) - CVE-2026-53032 kernel: bpf: Fix NULL deref in map_kptr_match_type for scalar regs
Summary: CVE-2026-53032 kernel: bpf: Fix NULL deref in map_kptr_match_type for scalar ...
Keywords:
Status: NEW
Alias: CVE-2026-53032
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-24 18:10 UTC by OSIDB Bzimport
Modified: 2026-06-26 14:37 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-06-24 18:10:01 UTC 
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.
Comment 1 Mauro Matteo Cascella 2026-06-26 14:32:32 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062454-CVE-2026-53032-464e@gregkh/T
Note You need to log in before you can comment on or make changes to this bug.