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GHSA-VWFW-86R9-43WP

Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-07-14 21:31

Details

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.

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53032"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T17:17:14Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix NULL deref in map_kptr_match_type for scalar regs\n\nCommit ab6c637ad027 (\"bpf: Fix a bpf_kptr_xchg() issue with local\nkptr\") refactored map_kptr_match_type() to branch on btf_is_kernel()\nbefore checking base_type(). A scalar register stored into a kptr\nslot has no btf, so the btf_is_kernel(reg-\u003ebtf) call dereferences\nNULL.\n\nMove the base_type() != PTR_TO_BTF_ID guard before any reg-\u003ebtf\naccess.",
  "id": "GHSA-vwfw-86r9-43wp",
  "modified": "2026-07-14T21:31:29Z",
  "published": "2026-06-24T18:32:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53032"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a36c1f72888bca0237295a4da19cd91821a90be"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4d0a375887ab4d49e4da1ff10f9606cab8f7c3ad"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/520454e839710c327808c2fcc98e28cee77355fc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6982653ce5f119982aa58f1af58e7bfbebf39252"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da1d615ce49a47986a8864e2371a26e97861085c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-53032 (GCVE-0-2026-53032)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-24 16:29

Title

bpf: Fix NULL deref in map_kptr_match_type for scalar regs

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.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/520454e839710c327…
https://git.kernel.org/stable/c/0a36c1f72888bca02…
https://git.kernel.org/stable/c/6982653ce5f119982…
https://git.kernel.org/stable/c/da1d615ce49a47986…
https://git.kernel.org/stable/c/4d0a375887ab4d49e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ab6c637ad0276e42f8acabcbc64932a6d346dab3 , < 520454e839710c327808c2fcc98e28cee77355fc (git) Affected: ab6c637ad0276e42f8acabcbc64932a6d346dab3 , < 0a36c1f72888bca0237295a4da19cd91821a90be (git) Affected: ab6c637ad0276e42f8acabcbc64932a6d346dab3 , < 6982653ce5f119982aa58f1af58e7bfbebf39252 (git) Affected: ab6c637ad0276e42f8acabcbc64932a6d346dab3 , < da1d615ce49a47986a8864e2371a26e97861085c (git) Affected: ab6c637ad0276e42f8acabcbc64932a6d346dab3 , < 4d0a375887ab4d49e4da1ff10f9606cab8f7c3ad (git) Affected: af3d2e0f3a54e67806959d161e613457772babc5 (git) Affected: 4782968e0d631b0d8944dcfd4bf8fb49be087101 (git) Affected: 6.4.16 , < 6.5 (semver) Affected: 6.5.3 , < 6.6 (semver)
Linux	Linux	Affected: 6.6 Unaffected: 0 , < 6.6 (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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