{"id":"CVE-2026-97537","summary":"scsi: qla2xxx: Fix queue teardown NULL dma_free and bitmap locking","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: qla2xxx: Fix queue teardown NULL dma_free and bitmap locking\n\nqla25xx_free_req_que() and qla25xx_free_rsp_que() have two pre-existing\nbugs exposed on the error path of qla25xx_create_{req,rsp}_que():\n\n 1. When dma_alloc_coherent() fails during queue creation, the error\n    path calls the free function with req-\u003ering / rsp-\u003ering still NULL\n    (from kzalloc).  The unconditional dma_free_coherent() with a NULL\n    cpu_addr is undefined behavior and can panic.\n\n 2. The free functions clear req_qid_map / rsp_qid_map under vport_lock,\n    but the create functions protect the same bitmaps with mq_lock.\n    This provides no mutual exclusion.  Additionally, the create error\n    path clears the bit and releases mq_lock before calling the free\n    function, creating a window where another thread can allocate the\n    same que_id and have its ha-\u003ereq_q_map entry clobbered by the\n    subsequent lockless NULL assignment in the free function.\n\nFix by:\n\n - Guarding dma_free_coherent() with a NULL check on the ring pointer.\n\n - Using mq_lock (the lock held by all creators) in the free functions\n   to atomically NULL the map entry and clear the bitmap bit.\n\n - Removing the now-redundant clear_bit blocks from the create error\n   paths since the free functions handle it atomically.","modified":"2026-10-09T17:27:02.149155924Z","published":"2026-09-25T10:21:35.608Z","related":["openSUSE-SU-2026:12074-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97537.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/34a40e0dff940ac5eba494a69b553ea571e24873"},{"type":"WEB","url":"https://git.kernel.org/stable/c/56e25d716833604fd5bff388e472f290bfe793aa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/94fc0c5b45de2bf3a691619bcfd10b9a49fc647e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f35cb67f2092b49d7949065dd56895ed47238f22"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97537.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97537"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"73208dfd7ab19f379d73e8a0fbf30f92c203e5e8"},{"fixed":"56e25d716833604fd5bff388e472f290bfe793aa"},{"fixed":"f35cb67f2092b49d7949065dd56895ed47238f22"},{"fixed":"94fc0c5b45de2bf3a691619bcfd10b9a49fc647e"},{"fixed":"34a40e0dff940ac5eba494a69b553ea571e24873"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-97537.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.29"},{"fixed":"6.12.112"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.53"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-97537.json"}}],"schema_version":"1.9.0"}