{
  "threat_severity" : "Moderate",
  "public_date" : "2025-02-26T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: block, bfq: don't move oom_bfqq",
    "id" : "2348174",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2348174"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
    "status" : "verified"
  },
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nblock, bfq: don't move oom_bfqq\nOur test report a UAF:\n[ 2073.019181] ==================================================================\n[ 2073.019188] BUG: KASAN: use-after-free in __bfq_put_async_bfqq+0xa0/0x168\n[ 2073.019191] Write of size 8 at addr ffff8000ccf64128 by task rmmod/72584\n[ 2073.019192]\n[ 2073.019196] CPU: 0 PID: 72584 Comm: rmmod Kdump: loaded Not tainted 4.19.90-yk #5\n[ 2073.019198] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015\n[ 2073.019200] Call trace:\n[ 2073.019203]  dump_backtrace+0x0/0x310\n[ 2073.019206]  show_stack+0x28/0x38\n[ 2073.019210]  dump_stack+0xec/0x15c\n[ 2073.019216]  print_address_description+0x68/0x2d0\n[ 2073.019220]  kasan_report+0x238/0x2f0\n[ 2073.019224]  __asan_store8+0x88/0xb0\n[ 2073.019229]  __bfq_put_async_bfqq+0xa0/0x168\n[ 2073.019233]  bfq_put_async_queues+0xbc/0x208\n[ 2073.019236]  bfq_pd_offline+0x178/0x238\n[ 2073.019240]  blkcg_deactivate_policy+0x1f0/0x420\n[ 2073.019244]  bfq_exit_queue+0x128/0x178\n[ 2073.019249]  blk_mq_exit_sched+0x12c/0x160\n[ 2073.019252]  elevator_exit+0xc8/0xd0\n[ 2073.019256]  blk_exit_queue+0x50/0x88\n[ 2073.019259]  blk_cleanup_queue+0x228/0x3d8\n[ 2073.019267]  null_del_dev+0xfc/0x1e0 [null_blk]\n[ 2073.019274]  null_exit+0x90/0x114 [null_blk]\n[ 2073.019278]  __arm64_sys_delete_module+0x358/0x5a0\n[ 2073.019282]  el0_svc_common+0xc8/0x320\n[ 2073.019287]  el0_svc_handler+0xf8/0x160\n[ 2073.019290]  el0_svc+0x10/0x218\n[ 2073.019291]\n[ 2073.019294] Allocated by task 14163:\n[ 2073.019301]  kasan_kmalloc+0xe0/0x190\n[ 2073.019305]  kmem_cache_alloc_node_trace+0x1cc/0x418\n[ 2073.019308]  bfq_pd_alloc+0x54/0x118\n[ 2073.019313]  blkcg_activate_policy+0x250/0x460\n[ 2073.019317]  bfq_create_group_hierarchy+0x38/0x110\n[ 2073.019321]  bfq_init_queue+0x6d0/0x948\n[ 2073.019325]  blk_mq_init_sched+0x1d8/0x390\n[ 2073.019330]  elevator_switch_mq+0x88/0x170\n[ 2073.019334]  elevator_switch+0x140/0x270\n[ 2073.019338]  elv_iosched_store+0x1a4/0x2a0\n[ 2073.019342]  queue_attr_store+0x90/0xe0\n[ 2073.019348]  sysfs_kf_write+0xa8/0xe8\n[ 2073.019351]  kernfs_fop_write+0x1f8/0x378\n[ 2073.019359]  __vfs_write+0xe0/0x360\n[ 2073.019363]  vfs_write+0xf0/0x270\n[ 2073.019367]  ksys_write+0xdc/0x1b8\n[ 2073.019371]  __arm64_sys_write+0x50/0x60\n[ 2073.019375]  el0_svc_common+0xc8/0x320\n[ 2073.019380]  el0_svc_handler+0xf8/0x160\n[ 2073.019383]  el0_svc+0x10/0x218\n[ 2073.019385]\n[ 2073.019387] Freed by task 72584:\n[ 2073.019391]  __kasan_slab_free+0x120/0x228\n[ 2073.019394]  kasan_slab_free+0x10/0x18\n[ 2073.019397]  kfree+0x94/0x368\n[ 2073.019400]  bfqg_put+0x64/0xb0\n[ 2073.019404]  bfqg_and_blkg_put+0x90/0xb0\n[ 2073.019408]  bfq_put_queue+0x220/0x228\n[ 2073.019413]  __bfq_put_async_bfqq+0x98/0x168\n[ 2073.019416]  bfq_put_async_queues+0xbc/0x208\n[ 2073.019420]  bfq_pd_offline+0x178/0x238\n[ 2073.019424]  blkcg_deactivate_policy+0x1f0/0x420\n[ 2073.019429]  bfq_exit_queue+0x128/0x178\n[ 2073.019433]  blk_mq_exit_sched+0x12c/0x160\n[ 2073.019437]  elevator_exit+0xc8/0xd0\n[ 2073.019440]  blk_exit_queue+0x50/0x88\n[ 2073.019443]  blk_cleanup_queue+0x228/0x3d8\n[ 2073.019451]  null_del_dev+0xfc/0x1e0 [null_blk]\n[ 2073.019459]  null_exit+0x90/0x114 [null_blk]\n[ 2073.019462]  __arm64_sys_delete_module+0x358/0x5a0\n[ 2073.019467]  el0_svc_common+0xc8/0x320\n[ 2073.019471]  el0_svc_handler+0xf8/0x160\n[ 2073.019474]  el0_svc+0x10/0x218\n[ 2073.019475]\n[ 2073.019479] The buggy address belongs to the object at ffff8000ccf63f00\nwhich belongs to the cache kmalloc-1024 of size 1024\n[ 2073.019484] The buggy address is located 552 bytes inside of\n1024-byte region [ffff8000ccf63f00, ffff8000ccf64300)\n[ 2073.019486] The buggy address belongs to the page:\n[ 2073.019492] page:ffff7e000333d800 count:1 mapcount:0 mapping:ffff8000c0003a00 index:0x0 compound_mapcount: 0\n[ 2073.020123] flags: 0x7ffff0000008100(slab|head)\n[ 2073.020403] raw: 07ffff0000008100 ffff7e0003334c08 ffff7e00001f5a08 ffff8000c0003a00\n[ 2073.020409] ra\n---truncated---" ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2022-11-15T00:00:00Z",
    "advisory" : "RHSA-2022:8267",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-162.6.1.el9_1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2022-11-15T00:00:00Z",
    "advisory" : "RHSA-2022:8267",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-162.6.1.el9_1"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Not 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" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Out of support scope",
    "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-2022-49179\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49179\nhttps://lore.kernel.org/linux-cve-announce/2025022614-CVE-2022-49179-9857@gregkh/T" ],
  "name" : "CVE-2022-49179",
  "csaw" : false
}