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GHSA-5M82-WC7W-682W

Vulnerability from github – Published: 2026-10-23 15:31 – Updated: 2026-10-23 15:31

Details

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

ovl: fix UAF in ovl_do_mkdir() debug print

ovl_do_mkdir() prints the input dentry with %pd after vfs_mkdir(). Since commit fe497f0759e0 ("VFS: change vfs_mkdir() to unlock on failure."), vfs_mkdir() calls end_creating() on the input dentry on failure and may replace it on success, so the post-call %pd can use-after-free the dentry when CONFIG_OVERLAY_FS_DEBUG is enabled.

Print the dentry before the call and only the result afterward.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98921"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T13:17:12Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\novl: fix UAF in ovl_do_mkdir() debug print\n\novl_do_mkdir() prints the input dentry with %pd after vfs_mkdir().\nSince commit fe497f0759e0 (\"VFS: change vfs_mkdir() to unlock on\nfailure.\"), vfs_mkdir() calls end_creating() on the input dentry on\nfailure and may replace it on success, so the post-call %pd can\nuse-after-free the dentry when CONFIG_OVERLAY_FS_DEBUG is enabled.\n\nPrint the dentry before the call and only the result afterward.",
  "id": "GHSA-5m82-wc7w-682w",
  "modified": "2026-10-23T15:31:30Z",
  "published": "2026-10-23T15:31:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98921"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/719bd33ab359c539a68a278c15a97deb77565cdb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae146bc1abdeb4607abf2975b858c053024e8ac1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98921 (GCVE-0-2026-98921)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:02 – Updated: 2026-10-23 12:05

Title

ovl: fix UAF in ovl_do_mkdir() debug print

Summary

In the Linux kernel, the following vulnerability has been resolved: ovl: fix UAF in ovl_do_mkdir() debug print ovl_do_mkdir() prints the input dentry with %pd after vfs_mkdir(). Since commit fe497f0759e0 ("VFS: change vfs_mkdir() to unlock on failure."), vfs_mkdir() calls end_creating() on the input dentry on failure and may replace it on success, so the post-call %pd can use-after-free the dentry when CONFIG_OVERLAY_FS_DEBUG is enabled. Print the dentry before the call and only the result afterward.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7061 records in the last 180 days details

References

2 references

URL	Tags
https://git.kernel.org/stable/c/719bd33ab359c539a…
https://git.kernel.org/stable/c/ae146bc1abdeb4607…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fe497f0759e0efb949f9480911d00b6045c21f50 , < 719bd33ab359c539a68a278c15a97deb77565cdb (git) Affected: fe497f0759e0efb949f9480911d00b6045c21f50 , < ae146bc1abdeb4607abf2975b858c053024e8ac1 (git)
Linux	Linux	Affected: 6.19 Unaffected: 0 , < 6.19 (semver) Unaffected: 7.2.9 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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JSON

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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "fs/overlayfs/overlayfs.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "status": "affected",
              "version": "fe497f0759e0efb949f9480911d00b6045c21f50",
              "versionType": "git"
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            {
              "lessThan": "ae146bc1abdeb4607abf2975b858c053024e8ac1",
              "status": "affected",
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          "versions": [
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              "version": "6.19"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\novl: fix UAF in ovl_do_mkdir() debug print\n\novl_do_mkdir() prints the input dentry with %pd after vfs_mkdir().\nSince commit fe497f0759e0 (\"VFS: change vfs_mkdir() to unlock on\nfailure.\"), vfs_mkdir() calls end_creating() on the input dentry on\nfailure and may replace it on success, so the post-call %pd can\nuse-after-free the dentry when CONFIG_OVERLAY_FS_DEBUG is enabled.\n\nPrint the dentry before the call and only the result afterward."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T12:05:33.583Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98921",
    "datePublished": "2026-10-23T12:02:38.969Z",
    "dateReserved": "2026-09-25T10:25:14.380Z",
    "dateUpdated": "2026-10-23T12:05:33.583Z",
    "state": "PUBLISHED"
  },
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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.

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