{"id":"CVE-2026-97537","title":"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 pa…","summary":"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 pa…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-476"],"vendor":"Linux","product":"Linux","affected":["Linux >= 73208dfd7ab19f379d73e8a0fbf30f92c203e5e8 < 56e25d716833604fd5bff388e472f290bfe793aa","Linux >= 73208dfd7ab19f379d73e8a0fbf30f92c203e5e8 < f35cb67f2092b49d7949065dd56895ed47238f22","Linux >= 73208dfd7ab19f379d73e8a0fbf30f92c203e5e8 < 94fc0c5b45de2bf3a691619bcfd10b9a49fc647e","Linux >= 73208dfd7ab19f379d73e8a0fbf30f92c203e5e8 < 34a40e0dff940ac5eba494a69b553ea571e24873","Linux 2.6.29"],"published":"2026-09-25","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:18:02.517","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97537","references":[{"url":"https://git.kernel.org/stable/c/34a40e0dff940ac5eba494a69b553ea571e24873","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/56e25d716833604fd5bff388e472f290bfe793aa","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/94fc0c5b45de2bf3a691619bcfd10b9a49fc647e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f35cb67f2092b49d7949065dd56895ed47238f22","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97537.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-97537"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541238"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97537"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97537"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97537.mbox"},{"url":"https://git.kernel.org/stable/c/2e6f60adf609c77e828f64e0cd371920bef91c12"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00206,"epssPercentile":0.10587,"cvssSource":"vendor","ingestedAt":"2026-09-25T11:06:38.922Z","slug":"CVE-2026-97537","body":"## Overview\n\nIn 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->ring / rsp->ring 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->req_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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97537.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":212482,"id":"CVE-2026-97537","ts":1790668188494,"field":"cvss","old":null,"new":"5.5"},{"seq":212481,"id":"CVE-2026-97537","ts":1790668188494,"field":"severity","old":"none","new":"medium"}]}