Vulnerability-Lookup

GHSA-5C7J-4454-42WH

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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

module: decompress: check return value of module_extend_max_pages()

module_extend_max_pages() calls kvrealloc() internally and returns -ENOMEM on allocation failure. The return value is never checked.

If the initial allocation fails, info->pages remains NULL and info->max_pages remains 0. Subsequent calls to module_get_next_page() will attempt to dynamically grow the array by calling module_extend_max_pages(info, 0) since info->used_pages is 0. This results in kvrealloc(NULL, 0) returning ZERO_SIZE_PTR, which is treated as a success, leading to a dereference of ZERO_SIZE_PTR and a kernel oops.

Fix: add the missing error check after module_extend_max_pages() and return immediately on failure. This matches the pattern used by every other kvrealloc() caller in the module loading path.

[Sami: Corrected the analysis in the commit message.]

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64297"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:10Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmodule: decompress: check return value of module_extend_max_pages()\n\nmodule_extend_max_pages() calls kvrealloc() internally and returns\n-ENOMEM on allocation failure. The return value is never checked.\n\nIf the initial allocation fails, info-\u003epages remains NULL and\ninfo-\u003emax_pages remains 0. Subsequent calls to module_get_next_page()\nwill attempt to dynamically grow the array by calling\nmodule_extend_max_pages(info, 0) since info-\u003eused_pages is 0. This\nresults in kvrealloc(NULL, 0) returning ZERO_SIZE_PTR, which is treated\nas a success, leading to a dereference of ZERO_SIZE_PTR and a kernel\noops.\n\nFix: add the missing error check after module_extend_max_pages() and\nreturn immediately on failure. This matches the pattern used by every\nother kvrealloc() caller in the module loading path.\n\n[Sami: Corrected the analysis in the commit message.]",
  "id": "GHSA-5c7j-4454-42wh",
  "modified": "2026-07-25T12:31:30Z",
  "published": "2026-07-25T12:31:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64297"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/168072baf9ad516d5a06046514c7fea4c0671990"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/786d2d84416a9a1c1a47b71a68d679d886284be2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a82e170637e050a803b4f37542371ef216bf66d2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/afcc0515bbdd28d509a2b5870faaa89b137f5d53"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e7da02659c229f73492fb1ed87ceda4090153aaa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e7f174715f9f0cbcb9e87b52e4fc4ef149baac98"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-64297 (GCVE-0-2026-64297)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-07-25 08:49

Title

module: decompress: check return value of module_extend_max_pages()

Summary

In the Linux kernel, the following vulnerability has been resolved: module: decompress: check return value of module_extend_max_pages() module_extend_max_pages() calls kvrealloc() internally and returns -ENOMEM on allocation failure. The return value is never checked. If the initial allocation fails, info->pages remains NULL and info->max_pages remains 0. Subsequent calls to module_get_next_page() will attempt to dynamically grow the array by calling module_extend_max_pages(info, 0) since info->used_pages is 0. This results in kvrealloc(NULL, 0) returning ZERO_SIZE_PTR, which is treated as a success, leading to a dereference of ZERO_SIZE_PTR and a kernel oops. Fix: add the missing error check after module_extend_max_pages() and return immediately on failure. This matches the pattern used by every other kvrealloc() caller in the module loading path. [Sami: Corrected the analysis in the commit message.]

Severity

No CVSS data available.

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/e7f174715f9f0cbcb…
https://git.kernel.org/stable/c/afcc0515bbdd28d50…
https://git.kernel.org/stable/c/168072baf9ad516d5…
https://git.kernel.org/stable/c/a82e170637e050a80…
https://git.kernel.org/stable/c/e7da02659c229f734…
https://git.kernel.org/stable/c/786d2d84416a9a1c1…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 , < e7f174715f9f0cbcb9e87b52e4fc4ef149baac98 (git) Affected: b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 , < afcc0515bbdd28d509a2b5870faaa89b137f5d53 (git) Affected: b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 , < 168072baf9ad516d5a06046514c7fea4c0671990 (git) Affected: b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 , < a82e170637e050a803b4f37542371ef216bf66d2 (git) Affected: b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 , < e7da02659c229f73492fb1ed87ceda4090153aaa (git) Affected: b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 , < 786d2d84416a9a1c1a47b71a68d679d886284be2 (git)
Linux	Linux	Affected: 5.17 Unaffected: 0 , < 5.17 (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

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JSON

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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.

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GHSA-5C7J-4454-42WH

CVE-2026-64297 (GCVE-0-2026-64297)

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Nomenclature