{"id":"DEBIAN-CVE-2024-53166","details":"In the Linux kernel, the following vulnerability has been resolved:  block, bfq: fix bfqq uaf in bfq_limit_depth()  Set new allocated bfqq to bic or remove freed bfqq from bic are both protected by bfqd-\u003elock, however bfq_limit_depth() is deferencing bfqq from bic without the lock, this can lead to UAF if the io_context is shared by multiple tasks.  For example, test bfq with io_uring can trigger following UAF in v6.6:  ================================================================== BUG: KASAN: slab-use-after-free in bfqq_group+0x15/0x50  Call Trace:  \u003cTASK\u003e  dump_stack_lvl+0x47/0x80  print_address_description.constprop.0+0x66/0x300  print_report+0x3e/0x70  kasan_report+0xb4/0xf0  bfqq_group+0x15/0x50  bfqq_request_over_limit+0x130/0x9a0  bfq_limit_depth+0x1b5/0x480  __blk_mq_alloc_requests+0x2b5/0xa00  blk_mq_get_new_requests+0x11d/0x1d0  blk_mq_submit_bio+0x286/0xb00  submit_bio_noacct_nocheck+0x331/0x400  __block_write_full_folio+0x3d0/0x640  writepage_cb+0x3b/0xc0  write_cache_pages+0x254/0x6c0  write_cache_pages+0x254/0x6c0  do_writepages+0x192/0x310  filemap_fdatawrite_wbc+0x95/0xc0  __filemap_fdatawrite_range+0x99/0xd0  filemap_write_and_wait_range.part.0+0x4d/0xa0  blkdev_read_iter+0xef/0x1e0  io_read+0x1b6/0x8a0  io_issue_sqe+0x87/0x300  io_wq_submit_work+0xeb/0x390  io_worker_handle_work+0x24d/0x550  io_wq_worker+0x27f/0x6c0  ret_from_fork_asm+0x1b/0x30  \u003c/TASK\u003e  Allocated by task 808602:  kasan_save_stack+0x1e/0x40  kasan_set_track+0x21/0x30  __kasan_slab_alloc+0x83/0x90  kmem_cache_alloc_node+0x1b1/0x6d0  bfq_get_queue+0x138/0xfa0  bfq_get_bfqq_handle_split+0xe3/0x2c0  bfq_init_rq+0x196/0xbb0  bfq_insert_request.isra.0+0xb5/0x480  bfq_insert_requests+0x156/0x180  blk_mq_insert_request+0x15d/0x440  blk_mq_submit_bio+0x8a4/0xb00  submit_bio_noacct_nocheck+0x331/0x400  __blkdev_direct_IO_async+0x2dd/0x330  blkdev_write_iter+0x39a/0x450  io_write+0x22a/0x840  io_issue_sqe+0x87/0x300  io_wq_submit_work+0xeb/0x390  io_worker_handle_work+0x24d/0x550  io_wq_worker+0x27f/0x6c0  ret_from_fork+0x2d/0x50  ret_from_fork_asm+0x1b/0x30  Freed by task 808589:  kasan_save_stack+0x1e/0x40  kasan_set_track+0x21/0x30  kasan_save_free_info+0x27/0x40  __kasan_slab_free+0x126/0x1b0  kmem_cache_free+0x10c/0x750  bfq_put_queue+0x2dd/0x770  __bfq_insert_request.isra.0+0x155/0x7a0  bfq_insert_request.isra.0+0x122/0x480  bfq_insert_requests+0x156/0x180  blk_mq_dispatch_plug_list+0x528/0x7e0  blk_mq_flush_plug_list.part.0+0xe5/0x590  __blk_flush_plug+0x3b/0x90  blk_finish_plug+0x40/0x60  do_writepages+0x19d/0x310  filemap_fdatawrite_wbc+0x95/0xc0  __filemap_fdatawrite_range+0x99/0xd0  filemap_write_and_wait_range.part.0+0x4d/0xa0  blkdev_read_iter+0xef/0x1e0  io_read+0x1b6/0x8a0  io_issue_sqe+0x87/0x300  io_wq_submit_work+0xeb/0x390  io_worker_handle_work+0x24d/0x550  io_wq_worker+0x27f/0x6c0  ret_from_fork+0x2d/0x50  ret_from_fork_asm+0x1b/0x30  Fix the problem by protecting bic_to_bfqq() with bfqd-\u003elock.","modified":"2026-09-15T09:03:16.296164333Z","published":"2024-12-27T14:15:23.703Z","upstream":["CVE-2024-53166"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-53166"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.133-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-53166.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-53166.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-53166.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:H/I:H/A:H"}]}