{"id":66641,"date":"2026-06-28T03:37:09","date_gmt":"2026-06-28T03:37:09","guid":{"rendered":"https:\/\/zero.redgem.net\/?p=66641"},"modified":"2026-06-28T03:37:09","modified_gmt":"2026-06-28T03:37:09","slug":"ksmbd-scope-conn-binding-slowpath-to-bound-sessions-only","status":"publish","type":"post","link":"https:\/\/zero.redgem.net\/?p=66641","title":{"rendered":"ksmbd: scope conn->binding slowpath to bound sessions only_CVE-2026-52911"},"content":{"rendered":"<p>{&#8220;lastseen&#8221;:&#8221;&#8221;,&#8221;description&#8221;:&#8221;In the Linux kernel, the following vulnerability has been resolved:\\n\\nksmbd: scope conn-\\u003ebinding slowpath to bound sessions only\\n\\nWhen the binding SESSION_SETUP sets conn-\\u003ebinding = true, the flag stays\\nset after the call so that the global session lookup in\\nksmbd_session_lookup_all() can find the session, which was not added to\\nconn-\\u003esessions. Because the flag is connection-wide, the global lookup\\npath will also resolve any other session by id if asked.\\n\\nTighten the global lookup so that the returned session must have this\\nconnection registered in its channel xarray (sess-\\u003eksmbd_chann_list).\\nThe channel entry is installed by the existing binding_session path in\\nntlm_authenticate()\/krb5_authenticate() when a SESSION_SETUP completes\\nsuccessfully, so this condition is a strict equivalent of \\&#8221;this\\nconnection has been accepted as a channel of this session\\&#8221;. Connections\\nthat have not bound to a given session cannot reach it via the global\\ntable.\\n\\nThe existing conn-\\u003ebinding gate for entering the slowpath is preserved\\nso that non-binding connections keep the fast-path-only behavior, and\\nthe session-\\u003estate check is unchanged.&#8221;,&#8221;published&#8221;:&#8221;2026-06-21T06:18:49.342Z&#8221;,&#8221;modified&#8221;:&#8221;2026-06-28T06:36:29.042Z&#8221;,&#8221;type&#8221;:&#8221;cve&#8221;,&#8221;title&#8221;:&#8221;ksmbd: scope conn-\\u003ebinding slowpath to bound sessions only&#8221;,&#8221;source&#8221;:&#8221;Linux&#8221;,&#8221;references&#8221;:&#8221;https:\/\/git.kernel.org\/stable\/c\/e74c00c6af428a39e564cdc5bd3a3648c6d8de87\\nhttps:\/\/git.kernel.org\/stable\/c\/e3a93ce6e25757b8f375e38b8f91e1d9da4edc1a\\nhttps:\/\/git.kernel.org\/stable\/c\/1ff46c9915c1cbf454db58a8cb87f7cac818e6a6\\nhttps:\/\/git.kernel.org\/stable\/c\/974c1c224e85549dc3459f3bb2255bbbdd2b9372\\nhttps:\/\/git.kernel.org\/stable\/c\/2cc8a4db633b10715450b291c1343859a4b2c509\\nhttps:\/\/git.kernel.org\/stable\/c\/1e2bec062c5c9ec282636715166056d0998d746d\\nhttps:\/\/git.kernel.org\/stable\/c\/b0da97c034b6107d14e537e212d4ce8b22109a58&#8243;,&#8221;id&#8221;:&#8221;CVE-2026-52911&#8243;,&#8221;bulletinFamily&#8221;:&#8221;&#8221;,&#8221;cwe&#8221;:null,&#8221;cvelist&#8221;:null,&#8221;sourceData&#8221;:&#8221;Linux Linux f5a544e3bab78142207e0242d22442db85ba1eff\\nLinux Linux f5a544e3bab78142207e0242d22442db85ba1eff\\nLinux Linux f5a544e3bab78142207e0242d22442db85ba1eff\\nLinux Linux f5a544e3bab78142207e0242d22442db85ba1eff\\nLinux Linux f5a544e3bab78142207e0242d22442db85ba1eff\\nLinux Linux f5a544e3bab78142207e0242d22442db85ba1eff\\nLinux Linux f5a544e3bab78142207e0242d22442db85ba1eff\\nLinux Linux 5.15&#8243;,&#8221;sourceHref&#8221;:&#8221;&#8221;,&#8221;cvss&#8221;:{&#8220;score&#8221;:8.8,&#8221;severity&#8221;:&#8221;HIGH&#8221;,&#8221;vector&#8221;:&#8221;CVSS:3.1\/AV:N\/AC:L\/PR:L\/UI:N\/S:U\/C:H\/I:H\/A:H&#8221;,&#8221;version&#8221;:&#8221;3.1&#8243;},&#8221;cvss2&#8243;:{},&#8221;cvss3&#8243;:{&#8220;version&#8221;:&#8221;&#8221;,&#8221;vectorString&#8221;:&#8221;&#8221;,&#8221;baseScore&#8221;:0,&#8221;baseSeverity&#8221;:&#8221;&#8221;,&#8221;attackVector&#8221;:&#8221;&#8221;,&#8221;attackComplexity&#8221;:&#8221;&#8221;,&#8221;privilegesRequired&#8221;:&#8221;&#8221;,&#8221;userInteraction&#8221;:&#8221;&#8221;,&#8221;scope&#8221;:&#8221;&#8221;,&#8221;confidentialityImpact&#8221;:&#8221;&#8221;,&#8221;integrityImpact&#8221;:&#8221;&#8221;,&#8221;availabilityImpact&#8221;:&#8221;&#8221;,&#8221;cvssV3&#8243;:{&#8220;version&#8221;:&#8221;&#8221;,&#8221;vectorString&#8221;:&#8221;&#8221;,&#8221;baseScore&#8221;:0,&#8221;baseSeverity&#8221;:&#8221;&#8221;,&#8221;attackVector&#8221;:&#8221;&#8221;,&#8221;attackComplexity&#8221;:&#8221;&#8221;,&#8221;privilegesRequired&#8221;:&#8221;&#8221;,&#8221;userInteraction&#8221;:&#8221;&#8221;,&#8221;scope&#8221;:&#8221;&#8221;,&#8221;confidentialityImpact&#8221;:&#8221;&#8221;,&#8221;integrityImpact&#8221;:&#8221;&#8221;,&#8221;availabilityImpact&#8221;:&#8221;&#8221;}},&#8221;href&#8221;:&#8221;&#8221;,&#8221;category_name&#8221;:&#8221;CVE&#8221;,&#8221;post_link&#8221;:&#8221;&#8221;,&#8221;product&#8221;:&#8221;Linux&#8221;,&#8221;version&#8221;:&#8221;f5a544e3bab78142207e0242d22442db85ba1eff&#8221;,&#8221;vendor&#8221;:&#8221;Linux&#8221;,&#8221;ai_description&#8221;:&#8221;&#8221;,&#8221;ai_severity&#8221;:&#8221;&#8221;,&#8221;ai_vendor&#8221;:&#8221;&#8221;,&#8221;ai_product&#8221;:&#8221;&#8221;,&#8221;ai_version&#8221;:&#8221;&#8221;,&#8221;ai_score&#8221;:0}<\/p>\n","protected":false},"excerpt":{"rendered":"<p>{&#8220;lastseen&#8221;:&#8221;&#8221;,&#8221;description&#8221;:&#8221;In the Linux kernel, the following vulnerability has been resolved:\\n\\nksmbd: scope conn-\\u003ebinding slowpath to bound sessions only\\n\\nWhen the binding SESSION_SETUP sets conn-\\u003ebinding = true, the&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[6,8,41,12,15,13,7,11,5],"class_list":["post-66641","post","type-post","status-publish","format-standard","hentry","category-category_cve","tag-cve","tag-cvss","tag-cvss-88","tag-exploit","tag-high","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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