CVE-2026-53032 (GCVE-0-2026-53032)
Vulnerability from cvelistv5
Published
2026-06-24 16:29
Modified
2026-06-24 16:29
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: ab6c637ad0276e42f8acabcbc64932a6d346dab3
Version: ab6c637ad0276e42f8acabcbc64932a6d346dab3
Version: ab6c637ad0276e42f8acabcbc64932a6d346dab3
Version: ab6c637ad0276e42f8acabcbc64932a6d346dab3
Version: ab6c637ad0276e42f8acabcbc64932a6d346dab3
Version: af3d2e0f3a54e67806959d161e613457772babc5
Version: 4782968e0d631b0d8944dcfd4bf8fb49be087101
Version: 6.4.16   ≤
Version: 6.5.3   ≤
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:29:39.916Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/520454e839710c327808c2fcc98e28cee77355fc"
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          "url": "https://git.kernel.org/stable/c/0a36c1f72888bca0237295a4da19cd91821a90be"
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        },
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          "url": "https://git.kernel.org/stable/c/da1d615ce49a47986a8864e2371a26e97861085c"
        },
        {
          "url": "https://git.kernel.org/stable/c/4d0a375887ab4d49e4da1ff10f9606cab8f7c3ad"
        }
      ],
      "title": "bpf: Fix NULL deref in map_kptr_match_type for scalar regs",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53032",
    "datePublished": "2026-06-24T16:29:39.916Z",
    "dateReserved": "2026-06-09T07:44:35.380Z",
    "dateUpdated": "2026-06-24T16:29:39.916Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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