{"api_version":"1","generated_at":"2026-11-07T15:53:38+00:00","cve":"CVE-2026-99280","urls":{"html":"https://cve.report/CVE-2026-99280","api":"https://cve.report/api/cve/CVE-2026-99280.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-99280","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-99280"},"summary":{"title":"ksmbd: drain session procfs readers before dropping table references","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: drain session procfs readers before dropping table references\n\nSession registration failure and connection cleanup can drop the table\nreference while the per-session procfs entry is still accessible. If a\nreader holds the last remaining reference, its final put calls\nproc_remove() from its own callback and waits for that callback to\nfinish.\n\nRemove the procfs entry before dropping the table reference in the\nregistration failure path. Queue sessions removed during connection\ncleanup and drain their procfs readers after releasing both session\nlocks, then return their table references. Keep the global hash node\nunhashed while a session is queued so a concurrent unregister cannot\ndrop the reference again.\n\nPrevious-session replacement also destroys the file table before the\nsession is finally freed. Detach the idr under the lock used by procfs\nfile counters, and report zero files after it has been detached. This\nprevents a reader from accessing the idr during or after its\ndestruction.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-11-07 14:17:03","updated_at":"2026-11-07 14:17:03"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/1c087cf7d5386c708d8984b263280b42b3daada0","name":"https://git.kernel.org/stable/c/1c087cf7d5386c708d8984b263280b42b3daada0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6789f0983f8e85ce3a5ed8c50fc05d613ead9c2c","name":"https://git.kernel.org/stable/c/6789f0983f8e85ce3a5ed8c50fc05d613ead9c2c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-99280","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99280","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d7fd1f98607f2cd358e583f9548bdf0173090a86 6789f0983f8e85ce3a5ed8c50fc05d613ead9c2c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d7fd1f98607f2cd358e583f9548bdf0173090a86 1c087cf7d5386c708d8984b263280b42b3daada0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c99ea7855124ca1428a1e59c2b4590aaef34eacf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.2.8 7.3 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.3","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3.2 7.3.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.4-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/smb/server/mgmt/user_session.c","fs/smb/server/vfs_cache.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"6789f0983f8e85ce3a5ed8c50fc05d613ead9c2c","status":"affected","version":"d7fd1f98607f2cd358e583f9548bdf0173090a86","versionType":"git"},{"lessThan":"1c087cf7d5386c708d8984b263280b42b3daada0","status":"affected","version":"d7fd1f98607f2cd358e583f9548bdf0173090a86","versionType":"git"},{"status":"affected","version":"c99ea7855124ca1428a1e59c2b4590aaef34eacf","versionType":"git"},{"lessThan":"7.3","status":"affected","version":"7.2.8","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/smb/server/mgmt/user_session.c","fs/smb/server/vfs_cache.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"7.3"},{"lessThan":"7.3","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"7.3.*","status":"unaffected","version":"7.3.2","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.4-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3.2","versionStartIncluding":"7.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.4-rc1","versionStartIncluding":"7.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.2.8","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: drain session procfs readers before dropping table references\n\nSession registration failure and connection cleanup can drop the table\nreference while the per-session procfs entry is still accessible. If a\nreader holds the last remaining reference, its final put calls\nproc_remove() from its own callback and waits for that callback to\nfinish.\n\nRemove the procfs entry before dropping the table reference in the\nregistration failure path. Queue sessions removed during connection\ncleanup and drain their procfs readers after releasing both session\nlocks, then return their table references. Keep the global hash node\nunhashed while a session is queued so a concurrent unregister cannot\ndrop the reference again.\n\nPrevious-session replacement also destroys the file table before the\nsession is finally freed. Detach the idr under the lock used by procfs\nfile counters, and report zero files after it has been detached. This\nprevents a reader from accessing the idr during or after its\ndestruction."}],"providerMetadata":{"dateUpdated":"2026-11-07T14:08:47.488Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/6789f0983f8e85ce3a5ed8c50fc05d613ead9c2c"},{"url":"https://git.kernel.org/stable/c/1c087cf7d5386c708d8984b263280b42b3daada0"}],"title":"ksmbd: drain session procfs readers before dropping table references","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-99280","datePublished":"2026-11-07T14:08:47.488Z","dateReserved":"2026-09-25T10:25:14.405Z","dateUpdated":"2026-11-07T14:08:47.488Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-11-07 14:17:03","lastModifiedDate":"2026-11-07 14:17:03","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"99280","Ordinal":"1","Title":"ksmbd: drain session procfs readers before dropping table refere","CVE":"CVE-2026-99280","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"99280","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: drain session procfs readers before dropping table references\n\nSession registration failure and connection cleanup can drop the table\nreference while the per-session procfs entry is still accessible. If a\nreader holds the last remaining reference, its final put calls\nproc_remove() from its own callback and waits for that callback to\nfinish.\n\nRemove the procfs entry before dropping the table reference in the\nregistration failure path. Queue sessions removed during connection\ncleanup and drain their procfs readers after releasing both session\nlocks, then return their table references. Keep the global hash node\nunhashed while a session is queued so a concurrent unregister cannot\ndrop the reference again.\n\nPrevious-session replacement also destroys the file table before the\nsession is finally freed. Detach the idr under the lock used by procfs\nfile counters, and report zero files after it has been detached. This\nprevents a reader from accessing the idr during or after its\ndestruction.","Type":"Description","Title":"ksmbd: drain session procfs readers before dropping table refere"}]}}}