Vulnerability-Lookup

GHSA-2M7J-G554-HF69

Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32

Details

In the Linux kernel, the following vulnerability has been resolved:

bpf: Copy per-CPU map value padding in copy_map_value_long()

In kernel, per-CPU map elements are stored with round_up(map->value_size, 8) bytes. On UAPI lookup paths, it copies the rounded size for each CPU into a temporary buffer.

However, copy_map_value_long() passes 'map->value_size' to bpf_obj_memcpy(). When the map has special fields, bpf_obj_memcpy() copies around those fields with memcpy(), and does not copy the tail padding between 'map->value_size' and round_up(map->value_size, 8).

The temporary UAPI lookup buffers are allocated without __GFP_ZERO. As a result, when the per-CPU map's value size is not equal to round_up(map->value_size, 8), UAPI LOOKUP_ELEM and its variants can return stale heap contents from that padding to user space. The same issue applies to bpf_iter for per-CPU maps.

Pass round_up(map->value_size, 8) to bpf_obj_memcpy() from copy_map_value_long(), so per-CPU maps both with and without special fields copy the entire per-CPU slot. Remove the now redundant round_up() from bpf_obj_memcpy()'s long_memcpy path.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-93174"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:18:13Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Copy per-CPU map value padding in copy_map_value_long()\n\nIn kernel, per-CPU map elements are stored with\nround_up(map-\u003evalue_size, 8) bytes. On UAPI lookup paths, it copies the\nrounded size for each CPU into a temporary buffer.\n\nHowever, copy_map_value_long() passes \u0027map-\u003evalue_size\u0027 to\nbpf_obj_memcpy(). When the map has special fields, bpf_obj_memcpy() copies\naround those fields with memcpy(), and does not copy the tail padding\nbetween \u0027map-\u003evalue_size\u0027 and round_up(map-\u003evalue_size, 8).\n\nThe temporary UAPI lookup buffers are allocated without __GFP_ZERO. As a\nresult, when the per-CPU map\u0027s value size is not equal to\nround_up(map-\u003evalue_size, 8), UAPI LOOKUP_ELEM and its variants can return\nstale heap contents from that padding to user space. The same issue\napplies to bpf_iter for per-CPU maps.\n\nPass round_up(map-\u003evalue_size, 8) to bpf_obj_memcpy() from\ncopy_map_value_long(), so per-CPU maps both with and without special\nfields copy the entire per-CPU slot. Remove the now redundant round_up()\nfrom bpf_obj_memcpy()\u0027s long_memcpy path.",
  "id": "GHSA-2m7j-g554-hf69",
  "modified": "2026-09-17T18:32:13Z",
  "published": "2026-09-17T18:32:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93174"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/003bf840ed3326bd01396ce7d5b431cef0d371e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5e9f69829835521aa2942d1d14bd0990fbc6991e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7cf9cd98cf6f0df3befc167ca6b54c07014d71de"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/953e85da53541a8dc3e7ad4e8532f29a34a32eae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ff3f22ed8d2f350b4c24ee26e33daea5f08d58ef"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-93174 (GCVE-0-2026-93174)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:12 – Updated: 2026-09-17 16:12

Title

bpf: Copy per-CPU map value padding in copy_map_value_long()

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: Copy per-CPU map value padding in copy_map_value_long() In kernel, per-CPU map elements are stored with round_up(map->value_size, 8) bytes. On UAPI lookup paths, it copies the rounded size for each CPU into a temporary buffer. However, copy_map_value_long() passes 'map->value_size' to bpf_obj_memcpy(). When the map has special fields, bpf_obj_memcpy() copies around those fields with memcpy(), and does not copy the tail padding between 'map->value_size' and round_up(map->value_size, 8). The temporary UAPI lookup buffers are allocated without __GFP_ZERO. As a result, when the per-CPU map's value size is not equal to round_up(map->value_size, 8), UAPI LOOKUP_ELEM and its variants can return stale heap contents from that padding to user space. The same issue applies to bpf_iter for per-CPU maps. Pass round_up(map->value_size, 8) to bpf_obj_memcpy() from copy_map_value_long(), so per-CPU maps both with and without special fields copy the entire per-CPU slot. Remove the now redundant round_up() from bpf_obj_memcpy()'s long_memcpy path.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/953e85da53541a8dc…
https://git.kernel.org/stable/c/003bf840ed3326bd0…
https://git.kernel.org/stable/c/5e9f69829835521aa…
https://git.kernel.org/stable/c/ff3f22ed8d2f350b4…
https://git.kernel.org/stable/c/7cf9cd98cf6f0df3b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 448325199f574d33824dbf9121efb03558412966 , < 953e85da53541a8dc3e7ad4e8532f29a34a32eae (git) Affected: 448325199f574d33824dbf9121efb03558412966 , < 003bf840ed3326bd01396ce7d5b431cef0d371e7 (git) Affected: 448325199f574d33824dbf9121efb03558412966 , < 5e9f69829835521aa2942d1d14bd0990fbc6991e (git) Affected: 448325199f574d33824dbf9121efb03558412966 , < ff3f22ed8d2f350b4c24ee26e33daea5f08d58ef (git) Affected: 448325199f574d33824dbf9121efb03558412966 , < 7cf9cd98cf6f0df3befc167ca6b54c07014d71de (git)
Linux	Linux	Affected: 6.1 Unaffected: 0 , < 6.1 (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
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              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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        {
          "url": "https://git.kernel.org/stable/c/7cf9cd98cf6f0df3befc167ca6b54c07014d71de"
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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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