{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2023-54313",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-54313",
    "idYear": 2023,
    "status": "PUBLISHED",
    "publishedAt": "2025-12-30T12:23:44.484Z",
    "updatedAt": "2026-05-11T19:59:33.173Z",
    "importedAt": "2026-10-24T01:57:03.413Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "ovl: fix null pointer dereference in ovl_get_acl_rcu()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\novl: fix null pointer dereference in ovl_get_acl_rcu()\n\nFollowing process:\n         P1                     P2\n path_openat\n  link_path_walk\n   may_lookup\n    inode_permission(rcu)\n     ovl_permission\n      acl_permission_check\n       check_acl\n        get_cached_acl_rcu\n\t ovl_get_inode_acl\n\t  realinode = ovl_inode_real(ovl_inode)\n\t                      drop_cache\n\t\t               __dentry_kill(ovl_dentry)\n\t\t\t\tiput(ovl_inode)\n\t\t                 ovl_destroy_inode(ovl_inode)\n\t\t                  dput(oi->__upperdentry)\n\t\t                   dentry_kill(upperdentry)\n\t\t                    dentry_unlink_inode\n\t\t\t\t     upperdentry->d_inode = NULL\n\t    ovl_inode_upper\n\t     upperdentry = ovl_i_dentry_upper(ovl_inode)\n\t     d_inode(upperdentry) // returns NULL\n\t  IS_POSIXACL(realinode) // NULL pointer dereference\n, will trigger an null pointer dereference at realinode:\n  [  205.472797] BUG: kernel NULL pointer dereference, address:\n                 0000000000000028\n  [  205.476701] CPU: 2 PID: 2713 Comm: ls Not tainted\n                 6.3.0-12064-g2edfa098e750-dirty #1216\n  [  205.478754] RIP: 0010:do_ovl_get_acl+0x5d/0x300\n  [  205.489584] Call Trace:\n  [  205.489812]  <TASK>\n  [  205.490014]  ovl_get_inode_acl+0x26/0x30\n  [  205.490466]  get_cached_acl_rcu+0x61/0xa0\n  [  205.490908]  generic_permission+0x1bf/0x4e0\n  [  205.491447]  ovl_permission+0x79/0x1b0\n  [  205.491917]  inode_permission+0x15e/0x2c0\n  [  205.492425]  link_path_walk+0x115/0x550\n  [  205.493311]  path_lookupat.isra.0+0xb2/0x200\n  [  205.493803]  filename_lookup+0xda/0x240\n  [  205.495747]  vfs_fstatat+0x7b/0xb0\n\nFetch a reproducer in [Link].\n\nUse the helper ovl_i_path_realinode() to get realinode and then do\nnon-nullptr checking.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "332f606b32b6291a944c8cf23b91f53a6e676525",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d97481c7b2739a704848bb3c01f224dc71bdf78e"
            },
            {
              "version": "332f606b32b6291a944c8cf23b91f53a6e676525",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c4a5fb1ae5d3f02d3227afde2b9339994389463d"
            },
            {
              "version": "332f606b32b6291a944c8cf23b91f53a6e676525",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d536af163c53ce9f9bcfe87d2e9946f06f1a7ea4"
            },
            {
              "version": "332f606b32b6291a944c8cf23b91f53a6e676525",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f4e19e595cc2e76a8a58413eb19d3d9c51328b53"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.15",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.15"
            },
            {
              "version": "5.15.121",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.40",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.4.4",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.4.*"
            },
            {
              "version": "6.5",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}