{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53271","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-06-09T07:44:35.395Z","datePublished":"2026-06-25T08:39:56.489Z","dateUpdated":"2026-06-25T08:39:56.489Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-06-25T08:39:56.489Z"},"descriptions":[{"lang":"en","value":"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/oplock.c"],"versions":[{"version":"8df4bcdb0a4232192b2445256c39b787d58ef14d","lessThan":"945a86b21b40fb17183f5b27461baa6f03e2467f","status":"affected","versionType":"git"},{"version":"c8efcc786146a951091588e5fa7e3c754850cb3c","lessThan":"1ff58dcfcab434ebb51649da33774fbb8e1f7b67","status":"affected","versionType":"git"},{"version":"c8efcc786146a951091588e5fa7e3c754850cb3c","lessThan":"e735dbd489e3ea02be78dba991056fe1138be51e","status":"affected","versionType":"git"},{"version":"c8efcc786146a951091588e5fa7e3c754850cb3c","lessThan":"75e33deda658c1ab3a9336cbdb1436536f9b3660","status":"affected","versionType":"git"},{"version":"c8efcc786146a951091588e5fa7e3c754850cb3c","lessThan":"b003086d76968298f22e7cf62239833b5a3a06b1","status":"affected","versionType":"git"},{"version":"6.6.32","lessThan":"6.6.143","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/oplock.c"],"versions":[{"version":"6.9","status":"affected"},{"version":"0","lessThan":"6.9","status":"unaffected","versionType":"semver"},{"version":"6.6.143","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.94","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.36","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.13","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.32","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.12.94"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.18.36"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.0.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/945a86b21b40fb17183f5b27461baa6f03e2467f"},{"url":"https://git.kernel.org/stable/c/1ff58dcfcab434ebb51649da33774fbb8e1f7b67"},{"url":"https://git.kernel.org/stable/c/e735dbd489e3ea02be78dba991056fe1138be51e"},{"url":"https://git.kernel.org/stable/c/75e33deda658c1ab3a9336cbdb1436536f9b3660"},{"url":"https://git.kernel.org/stable/c/b003086d76968298f22e7cf62239833b5a3a06b1"}],"title":"ksmbd: fix NULL-deref of opinfo->conn in oplock/lease break notifiers","x_generator":{"engine":"bippy-1.2.0"}}}}