{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-97556",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-24T16:01:01.154Z",
        "datePublished": "2026-09-25T10:21:47.078Z",
        "dateUpdated": "2026-10-19T09:09:19.287Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T09:09:19.287Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/smb/client/file.c"
                    ],
                    "versions": [
                        {
                            "version": "5ee28bcfbaacf289eb25c662a2862542ea6ce6a7",
                            "lessThan": "55c5f095d4df14271b238f826e1392fda7b6e60e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "e8f5f849ffce24490eb9449e98312b66c0dba76f",
                            "lessThan": "e9c5bcc88b8337157e480c85a6d2f326bc265012",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "e8f5f849ffce24490eb9449e98312b66c0dba76f",
                            "lessThan": "9ec991e148368e3207e98134c509a625097f7693",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "e8f5f849ffce24490eb9449e98312b66c0dba76f",
                            "lessThan": "dd03fd658ea59821505e0e643b6b7cbdf51c4e1d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "e8f5f849ffce24490eb9449e98312b66c0dba76f",
                            "lessThan": "1d1b0f1d812a4011a57bc6c70492c34a2e46c6dd",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "e8f5f849ffce24490eb9449e98312b66c0dba76f",
                            "lessThan": "23b26f4408ac3f35a482d2e5cf6fc865d4201b71",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "b99f490ea87ebcca3a429fd8837067feb56a4c7c",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6b67a6d2e50634fe127e656147c81915955e9f5e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6.1.47",
                            "lessThan": "6.1.189",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.128",
                            "lessThan": "5.16",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.4.12",
                            "lessThan": "6.5",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/smb/client/file.c"
                    ],
                    "versions": [
                        {
                            "version": "6.5",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.5",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.189",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.158",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.111",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.53",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.7",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.1.47",
                                    "versionEndExcluding": "6.1.189"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.5",
                                    "versionEndExcluding": "6.6.158"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.5",
                                    "versionEndExcluding": "6.12.111"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.5",
                                    "versionEndExcluding": "6.18.53"
                                },
                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.5",
                                    "versionEndExcluding": "7.2.7"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.5",
                                    "versionEndExcluding": "7.3"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.15.128"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.4.12"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/55c5f095d4df14271b238f826e1392fda7b6e60e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e9c5bcc88b8337157e480c85a6d2f326bc265012"
                },
                {
                    "url": "https://git.kernel.org/stable/c/9ec991e148368e3207e98134c509a625097f7693"
                },
                {
                    "url": "https://git.kernel.org/stable/c/dd03fd658ea59821505e0e643b6b7cbdf51c4e1d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1d1b0f1d812a4011a57bc6c70492c34a2e46c6dd"
                },
                {
                    "url": "https://git.kernel.org/stable/c/23b26f4408ac3f35a482d2e5cf6fc865d4201b71"
                }
            ],
            "title": "smb: client: avoid leaking refcount when cifs_sb_tlink() fails",
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}