{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-53166", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-11-19T17:17:25.005Z", "datePublished": "2024-12-27T13:49:12.233Z", "dateUpdated": "2026-08-05T11:44:14.452Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:44:14.452Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock, bfq: fix bfqq uaf in bfq_limit_depth()\n\nSet new allocated bfqq to bic or remove freed bfqq from bic are both\nprotected by bfqd->lock, however bfq_limit_depth() is deferencing bfqq\nfrom bic without the lock, this can lead to UAF if the io_context is\nshared by multiple tasks.\n\nFor example, test bfq with io_uring can trigger following UAF in v6.6:\n\n==================================================================\nBUG: KASAN: slab-use-after-free in bfqq_group+0x15/0x50\n\nCall Trace:\n \n dump_stack_lvl+0x47/0x80\n print_address_description.constprop.0+0x66/0x300\n print_report+0x3e/0x70\n kasan_report+0xb4/0xf0\n bfqq_group+0x15/0x50\n bfqq_request_over_limit+0x130/0x9a0\n bfq_limit_depth+0x1b5/0x480\n __blk_mq_alloc_requests+0x2b5/0xa00\n blk_mq_get_new_requests+0x11d/0x1d0\n blk_mq_submit_bio+0x286/0xb00\n submit_bio_noacct_nocheck+0x331/0x400\n __block_write_full_folio+0x3d0/0x640\n writepage_cb+0x3b/0xc0\n write_cache_pages+0x254/0x6c0\n write_cache_pages+0x254/0x6c0\n do_writepages+0x192/0x310\n filemap_fdatawrite_wbc+0x95/0xc0\n __filemap_fdatawrite_range+0x99/0xd0\n filemap_write_and_wait_range.part.0+0x4d/0xa0\n blkdev_read_iter+0xef/0x1e0\n io_read+0x1b6/0x8a0\n io_issue_sqe+0x87/0x300\n io_wq_submit_work+0xeb/0x390\n io_worker_handle_work+0x24d/0x550\n io_wq_worker+0x27f/0x6c0\n ret_from_fork_asm+0x1b/0x30\n \n\nAllocated by task 808602:\n kasan_save_stack+0x1e/0x40\n kasan_set_track+0x21/0x30\n __kasan_slab_alloc+0x83/0x90\n kmem_cache_alloc_node+0x1b1/0x6d0\n bfq_get_queue+0x138/0xfa0\n bfq_get_bfqq_handle_split+0xe3/0x2c0\n bfq_init_rq+0x196/0xbb0\n bfq_insert_request.isra.0+0xb5/0x480\n bfq_insert_requests+0x156/0x180\n blk_mq_insert_request+0x15d/0x440\n blk_mq_submit_bio+0x8a4/0xb00\n submit_bio_noacct_nocheck+0x331/0x400\n __blkdev_direct_IO_async+0x2dd/0x330\n blkdev_write_iter+0x39a/0x450\n io_write+0x22a/0x840\n io_issue_sqe+0x87/0x300\n io_wq_submit_work+0xeb/0x390\n io_worker_handle_work+0x24d/0x550\n io_wq_worker+0x27f/0x6c0\n ret_from_fork+0x2d/0x50\n ret_from_fork_asm+0x1b/0x30\n\nFreed by task 808589:\n kasan_save_stack+0x1e/0x40\n kasan_set_track+0x21/0x30\n kasan_save_free_info+0x27/0x40\n __kasan_slab_free+0x126/0x1b0\n kmem_cache_free+0x10c/0x750\n bfq_put_queue+0x2dd/0x770\n __bfq_insert_request.isra.0+0x155/0x7a0\n bfq_insert_request.isra.0+0x122/0x480\n bfq_insert_requests+0x156/0x180\n blk_mq_dispatch_plug_list+0x528/0x7e0\n blk_mq_flush_plug_list.part.0+0xe5/0x590\n __blk_flush_plug+0x3b/0x90\n blk_finish_plug+0x40/0x60\n do_writepages+0x19d/0x310\n filemap_fdatawrite_wbc+0x95/0xc0\n __filemap_fdatawrite_range+0x99/0xd0\n filemap_write_and_wait_range.part.0+0x4d/0xa0\n blkdev_read_iter+0xef/0x1e0\n io_read+0x1b6/0x8a0\n io_issue_sqe+0x87/0x300\n io_wq_submit_work+0xeb/0x390\n io_worker_handle_work+0x24d/0x550\n io_wq_worker+0x27f/0x6c0\n ret_from_fork+0x2d/0x50\n ret_from_fork_asm+0x1b/0x30\n\nFix the problem by protecting bic_to_bfqq() with bfqd->lock." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable code is reached through block-layer request allocation from local I/O submission (read/write/writeback/io_uring) on a device using the BFQ elevator, with no network exposure.\nAC:L - The attacker controls both sides of the race by spawning threads that share an io_context (io_uring io-wq workers inherit it via CLONE_IO, or clone(CLONE_IO) directly) and issuing concurrent cooperating I/O that triggers bfqq merge/free while another thread is in bfq_limit_depth(); it is reproducible in a loop, as the reporter demonstrated with io_uring.\nPR:L - Any unprivileged local user who can submit I/O to a BFQ-scheduled block device reaches bfq_limit_depth(); there is no capability, cgroup, or ownership check on the path, and the root blkcg satisfies the group lookup.\nUI:N - The attacker triggers the race entirely from its own threads' I/O submissions; no victim action or interaction is required.\nS:U - The use-after-free corrupts kernel memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed bfq_queue is dereferenced through a multi-level pointer chain (entity.parent → bfqg → blkg → blkcg → css.cgroup->level, plus entity->sched_data and weight fields), so after slab reuse an attacker-influenced object yields reads from arbitrary kernel addresses.\nI:H - The stale bfqq->bfqd pointer is used for spin_lock_irq(&bfqd->lock), writing the spinlock word at an attacker-influenceable address after reallocation, and UAF on a heap-sprayable object supports control-flow-relevant corruption.\nA:H - The use-after-free reliably produces KASAN slab-use-after-free reports and wild pointer dereferences in bfqq_group()/spin_lock_irq(), causing kernel oops or panic, and it can be re-triggered at will." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "block/bfq-iosched.c" ], "versions": [ { "version": "76f1df88bbc2f984eb0418cc90de0a8384e63604", "lessThan": "ada4ca5fd5a9d5212f28164d49a4885951c979c9", "status": "affected", "versionType": "git" }, { "version": "76f1df88bbc2f984eb0418cc90de0a8384e63604", "lessThan": "906cdbdd3b018ff69cc830173bce277a847d4fdc", "status": "affected", "versionType": "git" }, { "version": "76f1df88bbc2f984eb0418cc90de0a8384e63604", "lessThan": "dcaa738afde55085ac6056252e319479cf23cde2", "status": "affected", "versionType": "git" }, { "version": "76f1df88bbc2f984eb0418cc90de0a8384e63604", "lessThan": "01a853faaeaf3379ccf358ade582b1d28752126e", "status": "affected", "versionType": "git" }, { "version": "76f1df88bbc2f984eb0418cc90de0a8384e63604", "lessThan": "e8b8344de3980709080d86c157d24e7de07d70ad", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "block/bfq-iosched.c" ], "versions": [ { "version": "5.17", "status": "affected" }, { "version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.130", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.64", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.11", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.2", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.1.130" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.6.64" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.11.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.12.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ada4ca5fd5a9d5212f28164d49a4885951c979c9" }, { "url": "https://git.kernel.org/stable/c/906cdbdd3b018ff69cc830173bce277a847d4fdc" }, { "url": "https://git.kernel.org/stable/c/dcaa738afde55085ac6056252e319479cf23cde2" }, { "url": "https://git.kernel.org/stable/c/01a853faaeaf3379ccf358ade582b1d28752126e" }, { "url": "https://git.kernel.org/stable/c/e8b8344de3980709080d86c157d24e7de07d70ad" } ], "title": "block, bfq: fix bfqq uaf in bfq_limit_depth()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2024-53166", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-02-10T17:13:21.417315Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-02-10T17:21:09.790Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:32:00.758Z" } }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:38:32.857Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html" } ] } ] } }