{"schemaVersion":3,"id":"CVE-2021-47379","aliases":["UBUNTU-CVE-2021-47379","DEBIAN-CVE-2021-47379"],"status":"published","duplicateOf":null,"title":null,"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd\n\nKASAN reports a use-after-free report when doing fuzz test:\n\n[693354.104835] ==================================================================\n[693354.105094] BUG: KASAN: use-after-free in bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105336] Read of size 4 at addr ffff888be0a35664 by task sh/1453338\n\n[693354.105607] CPU: 41 PID: 1453338 Comm: sh Kdump: loaded Not tainted 4.18.0-147\n[693354.105610] Hardware name: Huawei 2288H V5/BC11SPSCB0, BIOS 0.81 07/02/2018\n[693354.105612] Call Trace:\n[693354.105621]  dump_stack+0xf1/0x19b\n[693354.105626]  ? show_regs_print_info+0x5/0x5\n[693354.105634]  ? printk+0x9c/0xc3\n[693354.105638]  ? cpumask_weight+0x1f/0x1f\n[693354.105648]  print_address_description+0x70/0x360\n[693354.105654]  kasan_report+0x1b2/0x330\n[693354.105659]  ? bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105665]  ? bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105670]  bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105675]  ? bfq_cpd_init+0x20/0x20\n[693354.105683]  cgroup_file_write+0x3aa/0x510\n[693354.105693]  ? ___slab_alloc+0x507/0x540\n[693354.105698]  ? cgroup_file_poll+0x60/0x60\n[693354.105702]  ? 0xffffffff89600000\n[693354.105708]  ? usercopy_abort+0x90/0x90\n[693354.105716]  ? mutex_lock+0xef/0x180\n[693354.105726]  kernfs_fop_write+0x1ab/0x280\n[693354.105732]  ? cgroup_file_poll+0x60/0x60\n[693354.105738]  vfs_write+0xe7/0x230\n[693354.105744]  ksys_write+0xb0/0x140\n[693354.105749]  ? __ia32_sys_read+0x50/0x50\n[693354.105760]  do_syscall_64+0x112/0x370\n[693354.105766]  ? syscall_return_slowpath+0x260/0x260\n[693354.105772]  ? do_page_fault+0x9b/0x270\n[693354.105779]  ? prepare_exit_to_usermode+0xf9/0x1a0\n[693354.105784]  ? enter_from_user_mode+0x30/0x30\n[693354.105793]  entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.105875] Allocated by task 1453337:\n[693354.106001]  kasan_kmalloc+0xa0/0xd0\n[693354.106006]  kmem_cache_alloc_node_trace+0x108/0x220\n[693354.106010]  bfq_pd_alloc+0x96/0x120\n[693354.106015]  blkcg_activate_policy+0x1b7/0x2b0\n[693354.106020]  bfq_create_group_hierarchy+0x1e/0x80\n[693354.106026]  bfq_init_queue+0x678/0x8c0\n[693354.106031]  blk_mq_init_sched+0x1f8/0x460\n[693354.106037]  elevator_switch_mq+0xe1/0x240\n[693354.106041]  elevator_switch+0x25/0x40\n[693354.106045]  elv_iosched_store+0x1a1/0x230\n[693354.106049]  queue_attr_store+0x78/0xb0\n[693354.106053]  kernfs_fop_write+0x1ab/0x280\n[693354.106056]  vfs_write+0xe7/0x230\n[693354.106060]  ksys_write+0xb0/0x140\n[693354.106064]  do_syscall_64+0x112/0x370\n[693354.106069]  entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.106114] Freed by task 1453336:\n[693354.106225]  __kasan_slab_free+0x130/0x180\n[693354.106229]  kfree+0x90/0x1b0\n[693354.106233]  blkcg_deactivate_policy+0x12c/0x220\n[693354.106238]  bfq_exit_queue+0xf5/0x110\n[693354.106241]  blk_mq_exit_sched+0x104/0x130\n[693354.106245]  __elevator_exit+0x45/0x60\n[693354.106249]  elevator_switch_mq+0xd6/0x240\n[693354.106253]  elevator_switch+0x25/0x40\n[693354.106257]  elv_iosched_store+0x1a1/0x230\n[693354.106261]  queue_attr_store+0x78/0xb0\n[693354.106264]  kernfs_fop_write+0x1ab/0x280\n[693354.106268]  vfs_write+0xe7/0x230\n[693354.106271]  ksys_write+0xb0/0x140\n[693354.106275]  do_syscall_64+0x112/0x370\n[693354.106280]  entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.106329] The buggy address belongs to the object at ffff888be0a35580\n                 which belongs to the cache kmalloc-1k of size 1024\n[693354.106736] The buggy address is located 228 bytes inside of\n                 1024-byte region [ffff888be0a35580, ffff888be0a35980)\n[693354.107114] The buggy address belongs to the page:\n[693354.107273] page:ffffea002f828c00 count:1 mapcount:0 mapping:ffff888107c17080 index:0x0 compound_mapcount: 0\n[693354.107606] flags: 0x17ffffc0008100(slab|head)\n[693354.107760] raw: 0017ffffc0008100 ffffea002fcbc808 ffffea0030bd3a08 ffff888107c17080\n[693354.108020] r\n---truncated---","dates":{"published":"2024-05-21T15:03:41.677Z","modified":"2026-05-23T15:19:51.664Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.8,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.8,"severity":"high","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":4.6,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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After Free","description":"The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory \"belongs\" to the code that operates on the new pointer.","type":"weakness","status":"Stable","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/416.html"}],"affected":[{"vendor":"debian","product":"linux","name":"linux","label":"linux","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/linux","purlType":"deb","versions":[{"text":"< 5.14.9-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.14.9-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"linux","name":"linux","label":"linux","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/linux","purlType":"deb","versions":[{"text":"< 4.15.0-239.251","noFixRecorded":false,"fixedIn":null},{"text":"< 5.4.0-91.102","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.15.0-239.251 | < 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