{"id":"CVE-2024-53170","revision":"acb0024993574722a73566eb0f7226dc","records":[{"revision":"acb0024993574722a73566eb0f7226dc","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2024-53170","aliases":[],"title":"block: fix uaf for flush rq while iterating tags","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nblock: fix uaf for flush rq while iterating tags\n\nblk_mq_clear_flush_rq_mapping() is not called during scsi probe, by\nchecking blk_queue_init_done(). However, QUEUE_FLAG_INIT_DONE is cleared\nin del_gendisk by commit aec89dc5d421 (\"block: keep q_usage_counter in\natomic mode after del_gendisk\"), hence for disk like scsi, following\nblk_mq_destroy_queue() will not clear flush rq from tags->rqs[] as well,\ncause following uaf that is found by our syzkaller for v6.6:\n\n==================================================================\nBUG: KASAN: slab-use-after-free in blk_mq_find_and_get_req+0x16e/0x1a0 block/blk-mq-tag.c:261\nRead of size 4 at addr ffff88811c969c20 by task kworker/1:2H/224909\n\nCPU: 1 PID: 224909 Comm: kworker/1:2H Not tainted 6.6.0-ga836a5060850 #32\nWorkqueue: kblockd blk_mq_timeout_work\nCall Trace:\n\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0x91/0xf0 lib/dump_stack.c:106\nprint_address_description.constprop.0+0x66/0x300 mm/kasan/report.c:364\nprint_report+0x3e/0x70 mm/kasan/report.c:475\nkasan_report+0xb8/0xf0 mm/kasan/report.c:588\nblk_mq_find_and_get_req+0x16e/0x1a0 block/blk-mq-tag.c:261\nbt_iter block/blk-mq-tag.c:288 [inline]\n__sbitmap_for_each_set include/linux/sbitmap.h:295 [inline]\nsbitmap_for_each_set include/linux/sbitmap.h:316 [inline]\nbt_for_each+0x455/0x790 block/blk-mq-tag.c:325\nblk_mq_queue_tag_busy_iter+0x320/0x740 block/blk-mq-tag.c:534\nblk_mq_timeout_work+0x1a3/0x7b0 block/blk-mq.c:1673\nprocess_one_work+0x7c4/0x1450 kernel/workqueue.c:2631\nprocess_scheduled_works kernel/workqueue.c:2704 [inline]\nworker_thread+0x804/0xe40 kernel/workqueue.c:2785\nkthread+0x346/0x450 kernel/kthread.c:388\nret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147\nret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:293\n\nAllocated by task 942:\nkasan_save_stack+0x22/0x50 mm/kasan/common.c:45\nkasan_set_track+0x25/0x30 mm/kasan/common.c:52\n____kasan_kmalloc mm/kasan/common.c:374 [inline]\n__kasan_kmalloc mm/kasan/common.c:383 [inline]\n__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:380\nkasan_kmalloc include/linux/kasan.h:198 [inline]\n__do_kmalloc_node mm/slab_common.c:1007 [inline]\n__kmalloc_node+0x69/0x170 mm/slab_common.c:1014\nkmalloc_node include/linux/slab.h:620 [inline]\nkzalloc_node include/linux/slab.h:732 [inline]\nblk_alloc_flush_queue+0x144/0x2f0 block/blk-flush.c:499\nblk_mq_alloc_hctx+0x601/0x940 block/blk-mq.c:3788\nblk_mq_alloc_and_init_hctx+0x27f/0x330 block/blk-mq.c:4261\nblk_mq_realloc_hw_ctxs+0x488/0x5e0 block/blk-mq.c:4294\nblk_mq_init_allocated_queue+0x188/0x860 block/blk-mq.c:4350\nblk_mq_init_queue_data block/blk-mq.c:4166 [inline]\nblk_mq_init_queue+0x8d/0x100 block/blk-mq.c:4176\nscsi_alloc_sdev+0x843/0xd50 drivers/scsi/scsi_scan.c:335\nscsi_probe_and_add_lun+0x77c/0xde0 drivers/scsi/scsi_scan.c:1189\n__scsi_scan_target+0x1fc/0x5a0 drivers/scsi/scsi_scan.c:1727\nscsi_scan_channel drivers/scsi/scsi_scan.c:1815 [inline]\nscsi_scan_channel+0x14b/0x1e0 drivers/scsi/scsi_scan.c:1791\nscsi_scan_host_selected+0x2fe/0x400 drivers/scsi/scsi_scan.c:1844\nscsi_scan+0x3a0/0x3f0 drivers/scsi/scsi_sysfs.c:151\nstore_scan+0x2a/0x60 drivers/scsi/scsi_sysfs.c:191\ndev_attr_store+0x5c/0x90 drivers/base/core.c:2388\nsysfs_kf_write+0x11c/0x170 fs/sysfs/file.c:136\nkernfs_fop_write_iter+0x3fc/0x610 fs/kernfs/file.c:338\ncall_write_iter include/linux/fs.h:2083 [inline]\nnew_sync_write+0x1b4/0x2d0 fs/read_write.c:493\nvfs_write+0x76c/0xb00 fs/read_write.c:586\nksys_write+0x127/0x250 fs/read_write.c:639\ndo_syscall_x64 arch/x86/entry/common.c:51 [inline]\ndo_syscall_64+0x70/0x120 arch/x86/entry/common.c:81\nentry_SYSCALL_64_after_hwframe+0x78/0xe2\n\nFreed by task 244687:\nkasan_save_stack+0x22/0x50 mm/kasan/common.c:45\nkasan_set_track+0x25/0x30 mm/kasan/common.c:52\nkasan_save_free_info+0x2b/0x50 mm/kasan/generic.c:522\n____kasan_slab_free mm/kasan/common.c:236 [inline]\n__kasan_slab_free+0x12a/0x1b0 mm/kasan/common.c:244\nkasan_slab_free include/linux/kasan.h:164 [in\n---truncated---","state":0,"publishedAt":"2024-12-27T13:49:15.712+00:00","modifiedAt":"2026-10-15T00:59:02.347+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"block/blk-sysfs.c\",\n                        \"block/genhd.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6cfeadbff3f8905f2854735ebb88e581402c16c4\",\n                            \"lessThan\": \"1921fe7d2836f8be1d321cf430d17e0d4e05301b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6cfeadbff3f8905f2854735ebb88e581402c16c4\",\n                            \"lessThan\": \"1364a29b71c7837770f1902c49e7a6e234d72c92\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6cfeadbff3f8905f2854735ebb88e581402c16c4\",\n                            \"lessThan\": \"a0e93b9fefafe97d596f9c98701ae6c3b04b3ff6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6cfeadbff3f8905f2854735ebb88e581402c16c4\",\n                            \"lessThan\": \"61092568f2a9acb0e6e186f03f2e0649a4e86d09\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6cfeadbff3f8905f2854735ebb88e581402c16c4\",\n                            \"lessThan\": \"3802f73bd80766d70f319658f334754164075bc3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"block/blk-sysfs.c\",\n                        \"block/genhd.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.19\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.127\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.74\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.11.11\",\n                            \"lessThanOrEqual\": \"6.11.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.2\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.13\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/1921fe7d2836f8be1d321cf430d17e0d4e05301b","https://git.kernel.org/stable/c/1364a29b71c7837770f1902c49e7a6e234d72c92","https://git.kernel.org/stable/c/a0e93b9fefafe97d596f9c98701ae6c3b04b3ff6","https://git.kernel.org/stable/c/61092568f2a9acb0e6e186f03f2e0649a4e86d09","https://git.kernel.org/stable/c/3802f73bd80766d70f319658f334754164075bc3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-53170","license":"CVE Program Terms of Use","key":"cve-program:CVE-2024-53170","identifiers":["CVE-2024-53170"]},"retained":false,"historicalAffected":[]}],"coverage":[]}