{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49179", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T01:49:39.281Z", "datePublished": "2025-02-26T01:55:32.100Z", "dateUpdated": "2026-08-12T23:58:15.467Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-12T23:58:15.467Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock, bfq: don't move oom_bfqq\n\nOur test report a UAF:\n\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\n which belongs to the cache kmalloc-1024 of size 1024\n[ 2073.019484] The buggy address is located 552 bytes inside of\n 1024-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---" } ], "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 BFQ cgroup path is reached through local block I/O (read/write syscalls) and blkcg association changes on a BFQ-managed queue, not via network packet processing.\nAC:L - An attacker can induce the oom_bfqq fallback via memory pressure they control, then trigger bfq_bfqq_move through cgroup-associated I/O; BFQ with group scheduling is a common real-world configuration, not a rare dependency.\nPR:L - An unprivileged local user can submit I/O on BFQ devices and cause bios/tasks to span blkcgs (app cgroups, writeback, delegated/user scopes); CAP_SYS_ADMIN is not required to reach the buggy move path.\nUI:N - The attacker performs the I/O and cgroup-related actions themselves; no separate victim interaction is required.\nS:U - This is a kernel memory-corruption bug within the host kernel's authority and does not cross a VM, IOMMU, or other security boundary.\nC:H - The bug is a use-after-free with a confirmed write to a freed bfq_group; UAF control of freed object contents enables arbitrary kernel memory disclosure.\nI:H - The KASAN report shows an 8-byte write to freed memory in __bfq_put_async_bfqq during group teardown, which is exploitable for heap corruption and control-flow hijacking.\nA:H - The use-after-free causes kernel oops/panic during elevator/device teardown and can crash the system even without a full exploit." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "block/bfq-cgroup.c" ], "versions": [ { "version": "0d52af590552473666da5b6111e7182d6cd23f92", "lessThan": "c4f5a678add58a8a0e7ee5e038496b376ea6d205", "status": "affected", "versionType": "git" }, { "version": "0d52af590552473666da5b6111e7182d6cd23f92", "lessThan": "7507ead1e9d42957c2340f2c4a0e9d00034e3366", "status": "affected", "versionType": "git" }, { "version": "0d52af590552473666da5b6111e7182d6cd23f92", "lessThan": "8f34dea99cd7761156a146a5258a67d045d862f7", "status": "affected", "versionType": "git" }, { "version": "0d52af590552473666da5b6111e7182d6cd23f92", "lessThan": "87fdfe8589d43e471dffb4c60f75eeb6f37afc4c", "status": "affected", "versionType": "git" }, { "version": "0d52af590552473666da5b6111e7182d6cd23f92", "lessThan": "c01fced8d38fbccc82787065229578006f28e020", "status": "affected", "versionType": "git" }, { "version": "0d52af590552473666da5b6111e7182d6cd23f92", "lessThan": "8410f70977734f21b8ed45c37e925d311dfda2e7", "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-cgroup.c" ], "versions": [ { "version": "4.16", "status": "affected" }, { "version": "0", "lessThan": "4.16", "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": "4.16", "versionEndExcluding": "5.4.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.10.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.15.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.16.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.17.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.18" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c4f5a678add58a8a0e7ee5e038496b376ea6d205" }, { "url": "https://git.kernel.org/stable/c/7507ead1e9d42957c2340f2c4a0e9d00034e3366" }, { "url": "https://git.kernel.org/stable/c/8f34dea99cd7761156a146a5258a67d045d862f7" }, { "url": "https://git.kernel.org/stable/c/87fdfe8589d43e471dffb4c60f75eeb6f37afc4c" }, { "url": "https://git.kernel.org/stable/c/c01fced8d38fbccc82787065229578006f28e020" }, { "url": "https://git.kernel.org/stable/c/8410f70977734f21b8ed45c37e925d311dfda2e7" } ], "title": "block, bfq: don't move oom_bfqq", "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-2022-49179", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-02-27T17:59:03.662860Z" } } } ], "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": "2025-02-27T18:02:29.552Z" } } ] } }