{"id":"DEBIAN-CVE-2022-50530","details":"In the Linux kernel, the following vulnerability has been resolved:  blk-mq: fix null pointer dereference in blk_mq_clear_rq_mapping()  Our syzkaller report a null pointer dereference, root cause is following:  __blk_mq_alloc_map_and_rqs  set-\u003etags[hctx_idx] = blk_mq_alloc_map_and_rqs   blk_mq_alloc_map_and_rqs    blk_mq_alloc_rqs     // failed due to oom     alloc_pages_node     // set-\u003etags[hctx_idx] is still NULL     blk_mq_free_rqs      drv_tags = set-\u003etags[hctx_idx];      // null pointer dereference is triggered      blk_mq_clear_rq_mapping(drv_tags, ...)  This is because commit 63064be150e4 (\"blk-mq: Add blk_mq_alloc_map_and_rqs()\") merged the two steps:  1) set-\u003etags[hctx_idx] = blk_mq_alloc_rq_map() 2) blk_mq_alloc_rqs(..., set-\u003etags[hctx_idx])  into one step:  set-\u003etags[hctx_idx] = blk_mq_alloc_map_and_rqs()  Since tags is not initialized yet in this case, fix the problem by checking if tags is NULL pointer in blk_mq_clear_rq_mapping().","modified":"2026-08-27T23:04:24.689721458Z","published":"2025-10-07T16:15:37.020Z","upstream":["CVE-2022-50530"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-50530"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50530.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50530.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50530.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}