Vulnerability-Lookup

GHSA-645X-23WH-RHVM

Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-06-28 09:31

Details

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

bpf: Fix OOB in pcpu_init_value

An out-of-bounds read occurs when copying element from a BPF_MAP_TYPE_CGROUP_STORAGE map to another pcpu map with the same value_size that is not rounded up to 8 bytes.

The issue happens when: 1. A CGROUP_STORAGE map is created with value_size not aligned to 8 bytes (e.g., 4 bytes) 2. A pcpu map is created with the same value_size (e.g., 4 bytes) 3. Update element in 2 with data in 1

pcpu_init_value assumes that all sources are rounded up to 8 bytes, and invokes copy_map_value_long to make a data copy, However, the assumption doesn't stand since there are some cases where the source may not be rounded up to 8 bytes, e.g., CGROUP_STORAGE, skb->data. the verifier verifies exactly the size that the source claims, not the size rounded up to 8 bytes by kernel, an OOB happens when the source has only 4 bytes while the copy size(4) is rounded up to 8.

Severity

7.1 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53076"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T17:17:21Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix OOB in pcpu_init_value\n\nAn out-of-bounds read occurs when copying element from a\nBPF_MAP_TYPE_CGROUP_STORAGE map to another pcpu map with the\nsame value_size that is not rounded up to 8 bytes.\n\nThe issue happens when:\n1. A CGROUP_STORAGE map is created with value_size not aligned to\n   8 bytes (e.g., 4 bytes)\n2. A pcpu map is created with the same value_size (e.g., 4 bytes)\n3. Update element in 2 with data in 1\n\npcpu_init_value assumes that all sources are rounded up to 8 bytes,\nand invokes copy_map_value_long to make a data copy, However, the\nassumption doesn\u0027t stand since there are some cases where the source\nmay not be rounded up to 8 bytes, e.g., CGROUP_STORAGE, skb-\u003edata.\nthe verifier verifies exactly the size that the source claims, not\nthe size rounded up to 8 bytes by kernel, an OOB happens when the\nsource has only 4 bytes while the copy size(4) is rounded up to 8.",
  "id": "GHSA-645x-23wh-rhvm",
  "modified": "2026-06-28T09:31:40Z",
  "published": "2026-06-24T18:32:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53076"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/576afddfee8d1108ee299bf10f581593540d1a36"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6086079e6d1c32ba4c4b422612b8aebb1129a96c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/634a793d0e1c822412095d25a1338f8831ad894c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e0378419b0e20178b5d100b27c9cc7e51064202e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e19c5ed9f1922a6854073f8651a63fa7be26e9e9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-53076 (GCVE-0-2026-53076)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-06-28 06:39

Title

bpf: Fix OOB in pcpu_init_value

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix OOB in pcpu_init_value An out-of-bounds read occurs when copying element from a BPF_MAP_TYPE_CGROUP_STORAGE map to another pcpu map with the same value_size that is not rounded up to 8 bytes. The issue happens when: 1. A CGROUP_STORAGE map is created with value_size not aligned to 8 bytes (e.g., 4 bytes) 2. A pcpu map is created with the same value_size (e.g., 4 bytes) 3. Update element in 2 with data in 1 pcpu_init_value assumes that all sources are rounded up to 8 bytes, and invokes copy_map_value_long to make a data copy, However, the assumption doesn't stand since there are some cases where the source may not be rounded up to 8 bytes, e.g., CGROUP_STORAGE, skb->data. the verifier verifies exactly the size that the source claims, not the size rounded up to 8 bytes by kernel, an OOB happens when the source has only 4 bytes while the copy size(4) is rounded up to 8.

Severity

7.1 (High)


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

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/e19c5ed9f1922a685…
https://git.kernel.org/stable/c/e0378419b0e20178b…
https://git.kernel.org/stable/c/6086079e6d1c32ba4…
https://git.kernel.org/stable/c/634a793d0e1c82241…
https://git.kernel.org/stable/c/576afddfee8d1108e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d3bec0138bfbe58606fc1d6f57a4cdc1a20218db , < e19c5ed9f1922a6854073f8651a63fa7be26e9e9 (git) Affected: d3bec0138bfbe58606fc1d6f57a4cdc1a20218db , < e0378419b0e20178b5d100b27c9cc7e51064202e (git) Affected: d3bec0138bfbe58606fc1d6f57a4cdc1a20218db , < 6086079e6d1c32ba4c4b422612b8aebb1129a96c (git) Affected: d3bec0138bfbe58606fc1d6f57a4cdc1a20218db , < 634a793d0e1c822412095d25a1338f8831ad894c (git) Affected: d3bec0138bfbe58606fc1d6f57a4cdc1a20218db , < 576afddfee8d1108ee299bf10f581593540d1a36 (git) Affected: c602ad2b52dcbca5af08e5137bd5575c039b52e3 (git) Affected: ab68b940dd6f7b5f8e2557937162dcb8a0583a05 (git) Affected: 5.4.78 , < 5.5 (semver) Affected: 5.9.9 , < 5.10 (semver)
Linux	Linux	Affected: 5.10 Unaffected: 0 , < 5.10 (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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              "versionType": "semver"
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              "versionType": "original_commit_for_fix"
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        }
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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.

Action not permitted

GHSA-645X-23WH-RHVM

CVE-2026-53076 (GCVE-0-2026-53076)

Tags

Sightings

Nomenclature