{"api_version":"1","generated_at":"2026-11-07T15:53:41+00:00","cve":"CVE-2026-99278","urls":{"html":"https://cve.report/CVE-2026-99278","api":"https://cve.report/api/cve/CVE-2026-99278.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-99278","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-99278"},"summary":{"title":"ksmbd: limit sessions on each connection","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: limit sessions on each connection\n\nThe pending setup limit only counts InProgress sessions. A client can\ncomplete authentication repeatedly and retain an unbounded number of Valid\nsessions on one connection.\n\nReserve a connection slot before allocating a session and retain a\nconnection reference while authentication is in progress. The first SMB3\nchannel takes over that reservation; binding to another connection reserves\none slot there. Reauthentication and authentication continuation reuse the\nexisting reservation. Return slots on allocation or insertion failure,\nchannel removal, and final session destruction.\n\nAccept max_sessions_per_connection in reserved startup-request space and\ndefault to 64 when older tools leave it zero. Keep the request size and\nexisting field offsets unchanged. Expose the configured limit in procfs.\nThe existing connection limits bound the aggregate number of sessions\nwithout a separate global session allocation limit.","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/94f8462fc9d5332bc54e91605003c17381e9171a","name":"https://git.kernel.org/stable/c/94f8462fc9d5332bc54e91605003c17381e9171a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dc6aa1ba8b7fff8800ad9bf143f17d308e02ec68","name":"https://git.kernel.org/stable/c/dc6aa1ba8b7fff8800ad9bf143f17d308e02ec68","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-99278","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99278","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d7fd1f98607f2cd358e583f9548bdf0173090a86 94f8462fc9d5332bc54e91605003c17381e9171a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d7fd1f98607f2cd358e583f9548bdf0173090a86 dc6aa1ba8b7fff8800ad9bf143f17d308e02ec68 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/connection.c","fs/smb/server/connection.h","fs/smb/server/ksmbd_netlink.h","fs/smb/server/mgmt/user_session.c","fs/smb/server/mgmt/user_session.h","fs/smb/server/proc.c","fs/smb/server/server.c","fs/smb/server/server.h","fs/smb/server/smb2pdu.c","fs/smb/server/transport_ipc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"94f8462fc9d5332bc54e91605003c17381e9171a","status":"affected","version":"d7fd1f98607f2cd358e583f9548bdf0173090a86","versionType":"git"},{"lessThan":"dc6aa1ba8b7fff8800ad9bf143f17d308e02ec68","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/connection.c","fs/smb/server/connection.h","fs/smb/server/ksmbd_netlink.h","fs/smb/server/mgmt/user_session.c","fs/smb/server/mgmt/user_session.h","fs/smb/server/proc.c","fs/smb/server/server.c","fs/smb/server/server.h","fs/smb/server/smb2pdu.c","fs/smb/server/transport_ipc.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: limit sessions on each connection\n\nThe pending setup limit only counts InProgress sessions. A client can\ncomplete authentication repeatedly and retain an unbounded number of Valid\nsessions on one connection.\n\nReserve a connection slot before allocating a session and retain a\nconnection reference while authentication is in progress. The first SMB3\nchannel takes over that reservation; binding to another connection reserves\none slot there. Reauthentication and authentication continuation reuse the\nexisting reservation. Return slots on allocation or insertion failure,\nchannel removal, and final session destruction.\n\nAccept max_sessions_per_connection in reserved startup-request space and\ndefault to 64 when older tools leave it zero. Keep the request size and\nexisting field offsets unchanged. Expose the configured limit in procfs.\nThe existing connection limits bound the aggregate number of sessions\nwithout a separate global session allocation limit."}],"providerMetadata":{"dateUpdated":"2026-11-07T14:08:46.983Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/94f8462fc9d5332bc54e91605003c17381e9171a"},{"url":"https://git.kernel.org/stable/c/dc6aa1ba8b7fff8800ad9bf143f17d308e02ec68"}],"title":"ksmbd: limit sessions on each connection","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-99278","datePublished":"2026-11-07T14:08:46.983Z","dateReserved":"2026-09-25T10:25:14.405Z","dateUpdated":"2026-11-07T14:08:46.983Z","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":"99278","Ordinal":"1","Title":"ksmbd: limit sessions on each connection","CVE":"CVE-2026-99278","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"99278","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: limit sessions on each connection\n\nThe pending setup limit only counts InProgress sessions. A client can\ncomplete authentication repeatedly and retain an unbounded number of Valid\nsessions on one connection.\n\nReserve a connection slot before allocating a session and retain a\nconnection reference while authentication is in progress. The first SMB3\nchannel takes over that reservation; binding to another connection reserves\none slot there. Reauthentication and authentication continuation reuse the\nexisting reservation. Return slots on allocation or insertion failure,\nchannel removal, and final session destruction.\n\nAccept max_sessions_per_connection in reserved startup-request space and\ndefault to 64 when older tools leave it zero. Keep the request size and\nexisting field offsets unchanged. Expose the configured limit in procfs.\nThe existing connection limits bound the aggregate number of sessions\nwithout a separate global session allocation limit.","Type":"Description","Title":"ksmbd: limit sessions on each connection"}]}}}