Vulnerability-Lookup

GHSA-FFF5-56XF-G7V8

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33

Details

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

fs: afs: revert mmap_prepare() change

Partially reverts commit 9d5403b1036c ("fs: convert most other generic_file_*mmap() users to .mmap_prepare()").

This is because the .mmap invocation establishes a refcount, but .mmap_prepare is called at a point where a merge or an allocation failure might happen after the call, which would leak the refcount increment.

Functionality is being added to permit the use of .mmap_prepare in this case, but in the interim, we need to fix this.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46100"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:31Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: afs: revert mmap_prepare() change\n\nPartially reverts commit 9d5403b1036c (\"fs: convert most other\ngeneric_file_*mmap() users to .mmap_prepare()\").\n\nThis is because the .mmap invocation establishes a refcount, but\n.mmap_prepare is called at a point where a merge or an allocation failure\nmight happen after the call, which would leak the refcount increment.\n\nFunctionality is being added to permit the use of .mmap_prepare in this\ncase, but in the interim, we need to fix this.",
  "id": "GHSA-fff5-56xf-g7v8",
  "modified": "2026-05-27T15:33:24Z",
  "published": "2026-05-27T15:33:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46100"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/48c7a0eaeea41da17d1d84d2d7a4c40be122b246"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f51f85c044809fbd39ac8ae07ac99bc43ce32bd5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fbfc6578eaca12daa0c09df1e9ba7f2c657b49da"
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  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-46100 (GCVE-0-2026-46100)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:59 – Updated: 2026-05-27 12:59

Title

fs: afs: revert mmap_prepare() change

Summary

In the Linux kernel, the following vulnerability has been resolved: fs: afs: revert mmap_prepare() change Partially reverts commit 9d5403b1036c ("fs: convert most other generic_file_*mmap() users to .mmap_prepare()"). This is because the .mmap invocation establishes a refcount, but .mmap_prepare is called at a point where a merge or an allocation failure might happen after the call, which would leak the refcount increment. Functionality is being added to permit the use of .mmap_prepare in this case, but in the interim, we need to fix this.

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/f51f85c044809fbd3…
https://git.kernel.org/stable/c/48c7a0eaeea41da17…
https://git.kernel.org/stable/c/fbfc6578eaca12daa…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 9d5403b1036cdcd4be0f9f5568612c0e60e73d79 , < f51f85c044809fbd39ac8ae07ac99bc43ce32bd5 (git) Affected: 9d5403b1036cdcd4be0f9f5568612c0e60e73d79 , < 48c7a0eaeea41da17d1d84d2d7a4c40be122b246 (git) Affected: 9d5403b1036cdcd4be0f9f5568612c0e60e73d79 , < fbfc6578eaca12daa0c09df1e9ba7f2c657b49da (git)
Linux	Linux	Affected: 6.17 Unaffected: 0 , < 6.17 (semver) Unaffected: 6.18.27 , ≤ 6.18.* (semver) Unaffected: 7.0.4 , ≤ 7.0.* (semver) Unaffected: 7.1-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/afs/file.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "versionType": "git"
            },
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              "version": "9d5403b1036cdcd4be0f9f5568612c0e60e73d79",
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          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
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            },
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              "versionType": "semver"
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              "version": "7.1-rc1",
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            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.17",
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                  "vulnerable": true
                }
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      "descriptions": [
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    "datePublished": "2026-05-27T12:59:06.853Z",
    "dateReserved": "2026-05-13T15:03:33.097Z",
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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-FFF5-56XF-G7V8

CVE-2026-46100 (GCVE-0-2026-46100)

Tags

Sightings

Nomenclature