{"id":"AZL-102911","summary":"CVE-2026-90167 affecting package kernel 6.6.150.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: serialize oplock close with pending break ownership\n\nclose may abort an in-flight oplock break while another breaker already\nholds an opinfo reference. Releasing pending_break wakes that waiter, but\nwithout serializing the close transition with bit acquisition it can become\na new break owner through the test_and_set_bit() fast path. It can then\noverwrite OPLOCK_CLOSING with OPLOCK_ACK_WAIT and continue a break for\na dying opinfo.\n\nMake OPLOCK_CLOSING terminal once the opinfo is removed from the inode\nlist. Serialize that transition, pending_break acquisition, and\nOPLOCK_ACK_WAIT setup with an opinfo state lock. A breaker which loses\nthe race releases its ownership and returns -ENOENT. Explicitly wake\npending_break waiters during close so they can observe the terminal state.\n\nAlso prevent ACK and timeout paths from replacing OPLOCK_CLOSING with\nOPLOCK_STATE_NONE.","modified":"2026-09-20T05:33:47Z","published":"2026-09-17T17:17:10Z","upstream":["CVE-2026-90167"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90167"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"6.6.150.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-102911.json"}}],"schema_version":"1.9.0"}