{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49176", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T01:49:39.280Z", "datePublished": "2025-02-26T01:55:30.586Z", "dateUpdated": "2026-08-12T23:58:13.436Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-12T23:58:13.436Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbfq: fix use-after-free in bfq_dispatch_request\n\nKASAN reports a use-after-free report when doing normal scsi-mq test\n\n[69832.239032] ==================================================================\n[69832.241810] BUG: KASAN: use-after-free in bfq_dispatch_request+0x1045/0x44b0\n[69832.243267] Read of size 8 at addr ffff88802622ba88 by task kworker/3:1H/155\n[69832.244656]\n[69832.245007] CPU: 3 PID: 155 Comm: kworker/3:1H Not tainted 5.10.0-10295-g576c6382529e #8\n[69832.246626] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\n[69832.249069] Workqueue: kblockd blk_mq_run_work_fn\n[69832.250022] Call Trace:\n[69832.250541] dump_stack+0x9b/0xce\n[69832.251232] ? bfq_dispatch_request+0x1045/0x44b0\n[69832.252243] print_address_description.constprop.6+0x3e/0x60\n[69832.253381] ? __cpuidle_text_end+0x5/0x5\n[69832.254211] ? vprintk_func+0x6b/0x120\n[69832.254994] ? bfq_dispatch_request+0x1045/0x44b0\n[69832.255952] ? bfq_dispatch_request+0x1045/0x44b0\n[69832.256914] kasan_report.cold.9+0x22/0x3a\n[69832.257753] ? bfq_dispatch_request+0x1045/0x44b0\n[69832.258755] check_memory_region+0x1c1/0x1e0\n[69832.260248] bfq_dispatch_request+0x1045/0x44b0\n[69832.261181] ? bfq_bfqq_expire+0x2440/0x2440\n[69832.262032] ? blk_mq_delay_run_hw_queues+0xf9/0x170\n[69832.263022] __blk_mq_do_dispatch_sched+0x52f/0x830\n[69832.264011] ? blk_mq_sched_request_inserted+0x100/0x100\n[69832.265101] __blk_mq_sched_dispatch_requests+0x398/0x4f0\n[69832.266206] ? blk_mq_do_dispatch_ctx+0x570/0x570\n[69832.267147] ? __switch_to+0x5f4/0xee0\n[69832.267898] blk_mq_sched_dispatch_requests+0xdf/0x140\n[69832.268946] __blk_mq_run_hw_queue+0xc0/0x270\n[69832.269840] blk_mq_run_work_fn+0x51/0x60\n[69832.278170] process_one_work+0x6d4/0xfe0\n[69832.278984] worker_thread+0x91/0xc80\n[69832.279726] ? __kthread_parkme+0xb0/0x110\n[69832.280554] ? process_one_work+0xfe0/0xfe0\n[69832.281414] kthread+0x32d/0x3f0\n[69832.282082] ? kthread_park+0x170/0x170\n[69832.282849] ret_from_fork+0x1f/0x30\n[69832.283573]\n[69832.283886] Allocated by task 7725:\n[69832.284599] kasan_save_stack+0x19/0x40\n[69832.285385] __kasan_kmalloc.constprop.2+0xc1/0xd0\n[69832.286350] kmem_cache_alloc_node+0x13f/0x460\n[69832.287237] bfq_get_queue+0x3d4/0x1140\n[69832.287993] bfq_get_bfqq_handle_split+0x103/0x510\n[69832.289015] bfq_init_rq+0x337/0x2d50\n[69832.289749] bfq_insert_requests+0x304/0x4e10\n[69832.290634] blk_mq_sched_insert_requests+0x13e/0x390\n[69832.291629] blk_mq_flush_plug_list+0x4b4/0x760\n[69832.292538] blk_flush_plug_list+0x2c5/0x480\n[69832.293392] io_schedule_prepare+0xb2/0xd0\n[69832.294209] io_schedule_timeout+0x13/0x80\n[69832.295014] wait_for_common_io.constprop.1+0x13c/0x270\n[69832.296137] submit_bio_wait+0x103/0x1a0\n[69832.296932] blkdev_issue_discard+0xe6/0x160\n[69832.297794] blk_ioctl_discard+0x219/0x290\n[69832.298614] blkdev_common_ioctl+0x50a/0x1750\n[69832.304715] blkdev_ioctl+0x470/0x600\n[69832.305474] block_ioctl+0xde/0x120\n[69832.306232] vfs_ioctl+0x6c/0xc0\n[69832.306877] __se_sys_ioctl+0x90/0xa0\n[69832.307629] do_syscall_64+0x2d/0x40\n[69832.308362] entry_SYSCALL_64_after_hwframe+0x44/0xa9\n[69832.309382]\n[69832.309701] Freed by task 155:\n[69832.310328] kasan_save_stack+0x19/0x40\n[69832.311121] kasan_set_track+0x1c/0x30\n[69832.311868] kasan_set_free_info+0x1b/0x30\n[69832.312699] __kasan_slab_free+0x111/0x160\n[69832.313524] kmem_cache_free+0x94/0x460\n[69832.314367] bfq_put_queue+0x582/0x940\n[69832.315112] __bfq_bfqd_reset_in_service+0x166/0x1d0\n[69832.317275] bfq_bfqq_expire+0xb27/0x2440\n[69832.318084] bfq_dispatch_request+0x697/0x44b0\n[69832.318991] __blk_mq_do_dispatch_sched+0x52f/0x830\n[69832.319984] __blk_mq_sched_dispatch_requests+0x398/0x4f0\n[69832.321087] blk_mq_sched_dispatch_requests+0xdf/0x140\n[69832.322225] __blk_mq_run_hw_queue+0xc0/0x270\n[69832.323114] blk_mq_run_work_fn+0x51/0x6\n---truncated---" } ], "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 bug is in the BFQ block I/O scheduler dispatch path (bfq_dispatch_request), reached when the local block layer dispatches requests from ordinary local I/O (read/write/ioctl) on a BFQ-scheduled device, not via a network protocol handler.\nAC:L - This is a synchronous dangling-pointer UAF within one locked dispatch call (expire/free of in_serv_queue, then bfq_bfqq_wait_request on the freed object), not a race the attacker cannot control; an unprivileged user can drive the needed queue create/expire/free pattern via I/O from short-lived processes.\nPR:L - Any unprivileged local user who can perform I/O on a filesystem backed by a BFQ device creates bfq_queue objects and exercises the same dispatch path; CAP_SYS_ADMIN is not required along the vulnerable path.\nUI:N - The attacker triggers the bug solely through their own I/O activity; no separate victim action is required.\nS:U - This is standard in-host kernel memory corruption / privilege escalation within the same security authority; it does not cross a VM, IOMMU, or other security boundary.\nC:H - Use-after-free of a bfq_queue slab object (and post-unlock use via bfq_update_dispatch_stats/bfqq_group when debug stats are enabled) enables heap reuse/spray and arbitrary kernel read primitives.\nI:H - The same bfq_queue UAF is exploitable for heap spraying and control-flow hijacking / arbitrary write primitives typical of kernel slab UAFs.\nA:H - The UAF produces kernel oops/panic (as shown by the KASAN report in bfq_dispatch_request) and can be triggered repeatedly to deny service." } ] } ], "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": "24bfd19bb7890255693ee5cb6dc100d8d215d00b", "lessThan": "74e610b5ee0d95e751280567100509eb11517efa", "status": "affected", "versionType": "git" }, { "version": "24bfd19bb7890255693ee5cb6dc100d8d215d00b", "lessThan": "5117c9ff4c2ebae0f5c2c262d42a25a8fbc086e6", "status": "affected", "versionType": "git" }, { "version": "24bfd19bb7890255693ee5cb6dc100d8d215d00b", "lessThan": "df6e00b1a53c57dca82c63b5ecbcad5452231bc7", "status": "affected", "versionType": "git" }, { "version": "24bfd19bb7890255693ee5cb6dc100d8d215d00b", "lessThan": "080665e2c3cbfc68359b9a348a3546ed9b908e7a", "status": "affected", "versionType": "git" }, { "version": "24bfd19bb7890255693ee5cb6dc100d8d215d00b", "lessThan": "5687958bf18f84384d809f521210d0f5deed03b0", "status": "affected", "versionType": "git" }, { "version": "24bfd19bb7890255693ee5cb6dc100d8d215d00b", "lessThan": "40b4ba0030e0b02cbacd424ebb9f4c8b0976c786", "status": "affected", "versionType": "git" }, { "version": "24bfd19bb7890255693ee5cb6dc100d8d215d00b", "lessThan": "ab552fcb17cc9e4afe0e4ac4df95fc7b30e8490a", "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": "4.15", "status": "affected" }, { "version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.238", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.189", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.110", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.33", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16.19", "lessThanOrEqual": "5.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17.2", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18", "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": "4.15", "versionEndExcluding": "4.19.238" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.4.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.10.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.15.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.16.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.17.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.18" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/74e610b5ee0d95e751280567100509eb11517efa" }, { "url": "https://git.kernel.org/stable/c/5117c9ff4c2ebae0f5c2c262d42a25a8fbc086e6" }, { "url": "https://git.kernel.org/stable/c/df6e00b1a53c57dca82c63b5ecbcad5452231bc7" }, { "url": "https://git.kernel.org/stable/c/080665e2c3cbfc68359b9a348a3546ed9b908e7a" }, { "url": "https://git.kernel.org/stable/c/5687958bf18f84384d809f521210d0f5deed03b0" }, { "url": "https://git.kernel.org/stable/c/40b4ba0030e0b02cbacd424ebb9f4c8b0976c786" }, { "url": "https://git.kernel.org/stable/c/ab552fcb17cc9e4afe0e4ac4df95fc7b30e8490a" } ], "title": "bfq: fix use-after-free in bfq_dispatch_request", "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-2022-49176", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-02-27T18:17:06.859094Z" } } } ], "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": "2025-02-27T18:22:34.604Z" } } ] } }