bpf: Fix NULL deref in map_kptr_match_type for scalar regs
Summary
| CVE | CVE-2026-53032 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-24 17:17:14 UTC |
| Updated | 2026-07-14 19:38:53 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 5.5 MEDIUM from [email protected]
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.001680000 probability, percentile 0.063470000 (date 2026-07-13)
Problem Types: CWE-476
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Linux | Linux Kernel | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected ab6c637ad0276e42f8acabcbc64932a6d346dab3 520454e839710c327808c2fcc98e28cee77355fc git | Not specified |
| CNA | Linux | Linux | affected ab6c637ad0276e42f8acabcbc64932a6d346dab3 0a36c1f72888bca0237295a4da19cd91821a90be git | Not specified |
| CNA | Linux | Linux | affected ab6c637ad0276e42f8acabcbc64932a6d346dab3 6982653ce5f119982aa58f1af58e7bfbebf39252 git | Not specified |
| CNA | Linux | Linux | affected ab6c637ad0276e42f8acabcbc64932a6d346dab3 da1d615ce49a47986a8864e2371a26e97861085c git | Not specified |
| CNA | Linux | Linux | affected ab6c637ad0276e42f8acabcbc64932a6d346dab3 4d0a375887ab4d49e4da1ff10f9606cab8f7c3ad git | Not specified |
| CNA | Linux | Linux | affected af3d2e0f3a54e67806959d161e613457772babc5 git | Not specified |
| CNA | Linux | Linux | affected 4782968e0d631b0d8944dcfd4bf8fb49be087101 git | Not specified |
| CNA | Linux | Linux | affected 6.4.16 6.5 semver | Not specified |
| CNA | Linux | Linux | affected 6.5.3 6.6 semver | Not specified |
| CNA | Linux | Linux | affected 6.6 | Not specified |
| CNA | Linux | Linux | unaffected 6.6 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.141 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.91 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.33 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0.10 7.0.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/0a36c1f72888bca0237295a4da19cd91821a90be | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/da1d615ce49a47986a8864e2371a26e97861085c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/6982653ce5f119982aa58f1af58e7bfbebf39252 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/4d0a375887ab4d49e4da1ff10f9606cab8f7c3ad | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/520454e839710c327808c2fcc98e28cee77355fc | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.