{"schema":"threatline.record/2","record":{"id":"CVE-2026-97556","aliases":[],"summary":"smb: client: avoid leaking refcount when cifs_sb_tlink() fails","details":"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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97556","source_modified_at":"2026-10-19T09:09:19.287Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","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"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97556","source_modified_at":"2026-10-19T09:09:19.287Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","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"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97556","source_modified_at":"2026-10-19T09:09:19.287Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"55c5f095d4df14271b238f826e1392fda7b6e60e","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97556","source_modified_at":"2026-10-19T09:09:19.287Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"9ec991e148368e3207e98134c509a625097f7693","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97556","source_modified_at":"2026-10-19T09:09:19.287Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"1d1b0f1d812a4011a57bc6c70492c34a2e46c6dd","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97556","source_modified_at":"2026-10-19T09:09:19.287Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"23b26f4408ac3f35a482d2e5cf6fc865d4201b71","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97556","source_modified_at":"2026-10-19T09:09:19.287Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.1.189","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97556","source_modified_at":"2026-10-19T09:09:19.287Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5.16","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97556","source_modified_at":"2026-10-19T09:09:19.287Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.5","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00205,"percentile":0.10027,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:21:47.078Z","modified_at":"2026-10-19T09:09:19.287Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-97556","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:09:19.287Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-97556","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/55c5f095d4df14271b238f826e1392fda7b6e60e"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/e9c5bcc88b8337157e480c85a6d2f326bc265012"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/9ec991e148368e3207e98134c509a625097f7693"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/dd03fd658ea59821505e0e643b6b7cbdf51c4e1d"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/1d1b0f1d812a4011a57bc6c70492c34a2e46c6dd"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/23b26f4408ac3f35a482d2e5cf6fc865d4201b71"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:09:19.287Z","content_hash":"a227cc2ec324ea51264fa05c21f044f733c40338bfbc02394e38ed3ce955256b"}}