{
  "threat_severity" : "Moderate",
  "public_date" : "2024-12-27T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: block: fix uaf for flush rq while iterating tags",
    "id" : "2334396",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2334396"
  },
  "cvss3" : {
    "cvss3_base_score" : "6.7",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-416",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nblock: fix uaf for flush rq while iterating tags\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==================================================================\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\nCPU: 1 PID: 224909 Comm: kworker/1:2H Not tainted 6.6.0-ga836a5060850 #32\nWorkqueue: kblockd blk_mq_timeout_work\nCall Trace:\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\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\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---" ],
  "statement" : "This issue is considered to be a moderate impact flaw, as the exploitation for this will need an ADMIN (or ROOT) privilege (PR:H).",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2025-11-11T00:00:00Z",
    "advisory" : "RHSA-2025:20518",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-611.5.1.el9_7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2025-11-11T00:00:00Z",
    "advisory" : "RHSA-2025:20518",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-611.5.1.el9_7"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2024-53170\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-53170\nhttps://lore.kernel.org/linux-cve-announce/2024122716-CVE-2024-53170-0908@gregkh/T" ],
  "name" : "CVE-2024-53170",
  "csaw" : false
}