{
  "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-2026-97556",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-97556",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-09-25T10:21:47.078Z",
    "updatedAt": "2026-10-19T09:09:19.287Z",
    "importedAt": "2026-10-24T01:58:41.756Z",
    "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": "smb: client: avoid leaking refcount when cifs_sb_tlink() fails",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: avoid leaking refcount when cifs_sb_tlink() fails\n\ncifs_oplock_break() takes over the reference that\ncifs_queue_oplock_break() acquired when it queued the work, and drops it\nwith _cifsFileInfo_put() once the break has been processed.\n\nOnly in setups with \"-o multiuser\", cifs_sb_tlink() may fail, at which\npoint cifs_oplock_break() returns without putting the file reference,\nmirroring the reference leak we already fixed in the companion patch to\ncifs_queue_oplock_break().\n\nThis would trigger a crash due to busy inodes on the next unmount:\n\n  BUG: Dentry ... still in use (1) [unmount of cifs cifs]\n  VFS: Busy inodes after unmount of cifs (cifs)\n\nDrop the reference on that path as well. Doing so before the out label\nmirrors the normal path, which also puts the reference before\ncifs_done_oplock_break().\n\nFound by Sashiko code review. The failure path was not exercised at\nruntime.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "5ee28bcfbaacf289eb25c662a2862542ea6ce6a7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "55c5f095d4df14271b238f826e1392fda7b6e60e"
            },
            {
              "version": "e8f5f849ffce24490eb9449e98312b66c0dba76f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e9c5bcc88b8337157e480c85a6d2f326bc265012"
            },
            {
              "version": "e8f5f849ffce24490eb9449e98312b66c0dba76f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9ec991e148368e3207e98134c509a625097f7693"
            },
            {
              "version": "e8f5f849ffce24490eb9449e98312b66c0dba76f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "dd03fd658ea59821505e0e643b6b7cbdf51c4e1d"
            },
            {
              "version": "e8f5f849ffce24490eb9449e98312b66c0dba76f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1d1b0f1d812a4011a57bc6c70492c34a2e46c6dd"
            },
            {
              "version": "e8f5f849ffce24490eb9449e98312b66c0dba76f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "23b26f4408ac3f35a482d2e5cf6fc865d4201b71"
            },
            {
              "version": "b99f490ea87ebcca3a429fd8837067feb56a4c7c",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "6b67a6d2e50634fe127e656147c81915955e9f5e",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "6.1.47",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.1.189"
            },
            {
              "version": "5.15.128",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.16"
            },
            {
              "version": "6.4.12",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.5"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.5",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.5"
            },
            {
              "version": "6.1.189",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.158",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.111",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.53",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.2.7",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "version": "7.3",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}