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configfs_lookup(): don't leave ->s_dentry dangling on failure

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: configfs_lookup(): don't leave ->s_dentry dangling on failure Normally ->s_dentry is cleared when dentry it's pointing to becomes negative (on eviction, realistically). However, that only happens if dentry gets to be positive in the first place; in case of inode allocation failure dentry never becomes positive, so ->d_iput() is not called at all. We do part of what normally would've been done by configfs_d_iput() (dropping the reference to configfs_dirent) manually, but we do not clear ->s_dentry there. Sloppy as it is, it does not matter in case of configfs_create_{dir,link}() - there configfs_dirent does not survive dropping the sole reference to it. However, for configfs_lookup() it *does* survive, with a dangling pointer to soon to be freed dentry sitting it its ->s_dentry. Subsequent getdents(2) in that directory will end up dereferencing that pointer in order to pick the inode number. Use after free... This is the minimal fix; the right approach is to set the linkage between dentry and configfs_dirent only after we know that we have an inode, but that takes more surgery and the bug had been there since 2006, so...

Announced Source revision 1
Original source ↗

CVE-2026-74359

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-74359

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
        "lessThan": "3e83b2203aa59bd279e4f677ec793d49dc9d019e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
        "lessThan": "b6e9c82522ddaa3ac0706b295ff4a71975d4f883",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
        "lessThan": "eee07d769da5ac4e4f7bd0bc17828646a318d499",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
        "lessThan": "9c747dcee164ead300de90550ad9e4122f0d1bbb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
        "lessThan": "c3b073a209a9baa691b744318ac929fecdd8847c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
        "lessThan": "57088b06109f3222963c639d8d743f42c2899b13",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
        "lessThan": "10da12d352b7b2bb330a8609fdda9a58bf0e9856",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/configfs/dir.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.16"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.16",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/configfs/dir.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74359

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#33109 · Revision 1
Added to Heist Feed
Publisher date
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