{"cve":{"cve_id":"CVE-2026-53271","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":null,"epss_percentile":null,"epss_as_of":null,"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix NULL-deref of opinfo->conn in oplock/lease break notifiers\n\nsmb2_oplock_break_noti() and smb2_lease_break_noti() read opinfo->conn\ninto a local with neither READ_ONCE() nor a NULL check.  Both run from\noplock_break() after opinfo_get_list() has dropped ci->m_lock, so a\nconcurrent SMB2 LOGOFF (session_fd_check()) can set op->conn = NULL\nunder ci->m_lock within that window.  ksmbd_conn_r_count_inc(conn) then\nwrites through NULL at offset 0xc4 -- a remotely triggerable oops.\n\nGuard both reads the way compare_guid_key() already does: read\nopinfo->conn with READ_ONCE() and return early if it is NULL, before\nallocating the work struct so nothing leaks.  A NULL conn means the\nclient is gone and the break is moot, so return 0; oplock_break() treats\nthat as success and runs the normal teardown.","published_at":"2026-06-25T08:39:56.489000Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":null,"nvd_references":["https://git.kernel.org/stable/c/945a86b21b40fb17183f5b27461baa6f03e2467f","https://git.kernel.org/stable/c/1ff58dcfcab434ebb51649da33774fbb8e1f7b67","https://git.kernel.org/stable/c/e735dbd489e3ea02be78dba991056fe1138be51e","https://git.kernel.org/stable/c/75e33deda658c1ab3a9336cbdb1436536f9b3660","https://git.kernel.org/stable/c/b003086d76968298f22e7cf62239833b5a3a06b1"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-28T17:55:28.590503Z","updated_at":"2026-06-28T23:30:51.545322Z"},"effective_severity":null,"badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"8df4bcdb0a4232192b2445256c39b787d58ef14d","version_start_inclusive":true,"version_end":"945a86b21b40fb17183f5b27461baa6f03e2467f","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:8df4bcdb0a4232192b2445256c39b787d58ef14d:945a86b21b40fb17183f5b27461baa6f03e2467f"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"c8efcc786146a951091588e5fa7e3c754850cb3c","version_start_inclusive":true,"version_end":"1ff58dcfcab434ebb51649da33774fbb8e1f7b67","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:c8efcc786146a951091588e5fa7e3c754850cb3c:1ff58dcfcab434ebb51649da33774fbb8e1f7b67"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"c8efcc786146a951091588e5fa7e3c754850cb3c","version_start_inclusive":true,"version_end":"e735dbd489e3ea02be78dba991056fe1138be51e","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:c8efcc786146a951091588e5fa7e3c754850cb3c:e735dbd489e3ea02be78dba991056fe1138be51e"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"c8efcc786146a951091588e5fa7e3c754850cb3c","version_start_inclusive":true,"version_end":"75e33deda658c1ab3a9336cbdb1436536f9b3660","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:c8efcc786146a951091588e5fa7e3c754850cb3c:75e33deda658c1ab3a9336cbdb1436536f9b3660"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"c8efcc786146a951091588e5fa7e3c754850cb3c","version_start_inclusive":true,"version_end":"b003086d76968298f22e7cf62239833b5a3a06b1","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:c8efcc786146a951091588e5fa7e3c754850cb3c:b003086d76968298f22e7cf62239833b5a3a06b1"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.6.32","version_start_inclusive":true,"version_end":"6.6.143","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:6.6.32:6.6.143"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.9","version_start_inclusive":true,"version_end":"6.9","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.9:6.9"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0","version_start_inclusive":true,"version_end":"6.9","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:0:6.9"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.6.143","version_start_inclusive":true,"version_end":"6.6.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.6.143:6.6.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.12.94","version_start_inclusive":true,"version_end":"6.12.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.12.94:6.12.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.18.36","version_start_inclusive":true,"version_end":"6.18.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.18.36:6.18.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7.0.13","version_start_inclusive":true,"version_end":"7.0.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:7.0.13:7.0.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7.1","version_start_inclusive":true,"version_end":"*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:7.1:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://git.kernel.org/stable/c/945a86b21b40fb17183f5b27461baa6f03e2467f","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/1ff58dcfcab434ebb51649da33774fbb8e1f7b67","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/e735dbd489e3ea02be78dba991056fe1138be51e","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/75e33deda658c1ab3a9336cbdb1436536f9b3660","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/b003086d76968298f22e7cf62239833b5a3a06b1","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-06-25T08:39:56.489000Z","label":"CVE published","source":null}]}