CVE-2021-47379 (GCVE-0-2021-47379)
Vulnerability from cvelistv5 – Published: 2024-05-21 15:03 – Updated: 2026-05-23 15:19
VLAI
EPSS
VEX
Title
blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd
Summary
In the Linux kernel, the following vulnerability has been resolved:
blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd
KASAN reports a use-after-free report when doing fuzz test:
[693354.104835] ==================================================================
[693354.105094] BUG: KASAN: use-after-free in bfq_io_set_weight_legacy+0xd3/0x160
[693354.105336] Read of size 4 at addr ffff888be0a35664 by task sh/1453338
[693354.105607] CPU: 41 PID: 1453338 Comm: sh Kdump: loaded Not tainted 4.18.0-147
[693354.105610] Hardware name: Huawei 2288H V5/BC11SPSCB0, BIOS 0.81 07/02/2018
[693354.105612] Call Trace:
[693354.105621] dump_stack+0xf1/0x19b
[693354.105626] ? show_regs_print_info+0x5/0x5
[693354.105634] ? printk+0x9c/0xc3
[693354.105638] ? cpumask_weight+0x1f/0x1f
[693354.105648] print_address_description+0x70/0x360
[693354.105654] kasan_report+0x1b2/0x330
[693354.105659] ? bfq_io_set_weight_legacy+0xd3/0x160
[693354.105665] ? bfq_io_set_weight_legacy+0xd3/0x160
[693354.105670] bfq_io_set_weight_legacy+0xd3/0x160
[693354.105675] ? bfq_cpd_init+0x20/0x20
[693354.105683] cgroup_file_write+0x3aa/0x510
[693354.105693] ? ___slab_alloc+0x507/0x540
[693354.105698] ? cgroup_file_poll+0x60/0x60
[693354.105702] ? 0xffffffff89600000
[693354.105708] ? usercopy_abort+0x90/0x90
[693354.105716] ? mutex_lock+0xef/0x180
[693354.105726] kernfs_fop_write+0x1ab/0x280
[693354.105732] ? cgroup_file_poll+0x60/0x60
[693354.105738] vfs_write+0xe7/0x230
[693354.105744] ksys_write+0xb0/0x140
[693354.105749] ? __ia32_sys_read+0x50/0x50
[693354.105760] do_syscall_64+0x112/0x370
[693354.105766] ? syscall_return_slowpath+0x260/0x260
[693354.105772] ? do_page_fault+0x9b/0x270
[693354.105779] ? prepare_exit_to_usermode+0xf9/0x1a0
[693354.105784] ? enter_from_user_mode+0x30/0x30
[693354.105793] entry_SYSCALL_64_after_hwframe+0x65/0xca
[693354.105875] Allocated by task 1453337:
[693354.106001] kasan_kmalloc+0xa0/0xd0
[693354.106006] kmem_cache_alloc_node_trace+0x108/0x220
[693354.106010] bfq_pd_alloc+0x96/0x120
[693354.106015] blkcg_activate_policy+0x1b7/0x2b0
[693354.106020] bfq_create_group_hierarchy+0x1e/0x80
[693354.106026] bfq_init_queue+0x678/0x8c0
[693354.106031] blk_mq_init_sched+0x1f8/0x460
[693354.106037] elevator_switch_mq+0xe1/0x240
[693354.106041] elevator_switch+0x25/0x40
[693354.106045] elv_iosched_store+0x1a1/0x230
[693354.106049] queue_attr_store+0x78/0xb0
[693354.106053] kernfs_fop_write+0x1ab/0x280
[693354.106056] vfs_write+0xe7/0x230
[693354.106060] ksys_write+0xb0/0x140
[693354.106064] do_syscall_64+0x112/0x370
[693354.106069] entry_SYSCALL_64_after_hwframe+0x65/0xca
[693354.106114] Freed by task 1453336:
[693354.106225] __kasan_slab_free+0x130/0x180
[693354.106229] kfree+0x90/0x1b0
[693354.106233] blkcg_deactivate_policy+0x12c/0x220
[693354.106238] bfq_exit_queue+0xf5/0x110
[693354.106241] blk_mq_exit_sched+0x104/0x130
[693354.106245] __elevator_exit+0x45/0x60
[693354.106249] elevator_switch_mq+0xd6/0x240
[693354.106253] elevator_switch+0x25/0x40
[693354.106257] elv_iosched_store+0x1a1/0x230
[693354.106261] queue_attr_store+0x78/0xb0
[693354.106264] kernfs_fop_write+0x1ab/0x280
[693354.106268] vfs_write+0xe7/0x230
[693354.106271] ksys_write+0xb0/0x140
[693354.106275] do_syscall_64+0x112/0x370
[693354.106280] entry_SYSCALL_64_after_hwframe+0x65/0xca
[693354.106329] The buggy address belongs to the object at ffff888be0a35580
which belongs to the cache kmalloc-1k of size 1024
[693354.106736] The buggy address is located 228 bytes inside of
1024-byte region [ffff888be0a35580, ffff888be0a35980)
[693354.107114] The buggy address belongs to the page:
[693354.107273] page:ffffea002f828c00 count:1 mapcount:0 mapping:ffff888107c17080 index:0x0 compound_mapcount: 0
[693354.107606] flags: 0x17ffffc0008100(slab|head)
[693354.107760] raw: 0017ffffc0008100 ffffea002fcbc808 ffffea0030bd3a08 ffff888107c17080
[693354.108020] r
---truncated---
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-11 18:56 UTC
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
946b81da114b8ba5c74bb01e57c0c6eca2bdc801 , < d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08
(git)
Affected: 946b81da114b8ba5c74bb01e57c0c6eca2bdc801 , < f58d305887ad7b24986d58e881f6806bb81b2bdf (git) Affected: 946b81da114b8ba5c74bb01e57c0c6eca2bdc801 , < 7c2c69e010431b0157c9454adcdd2305809bf9fb (git) Affected: 946b81da114b8ba5c74bb01e57c0c6eca2bdc801 , < 858560b27645e7e97aca37ee8f232cccd658fbd2 (git) Affected: 9d5e2d69705fed4ab527f5a283b90ae602f4e0fd (git) Affected: 3ca6e949b751fa3dfbf475ce635364cef543738b (git) Affected: 4.14.51 , < 4.15 (semver) Affected: 4.16.17 , < 4.17 (semver) |
guessed | |
| Linux | Linux |
Affected:
4.17
Unaffected: 0 , < 4.17 (semver) Unaffected: 5.4.150 , ≤ 5.4.* (semver) Unaffected: 5.10.70 , ≤ 5.10.* (semver) Unaffected: 5.14.9 , ≤ 5.14.* (semver) Unaffected: 5.15 , ≤ * (original_commit_for_fix) |
guessed |
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"descriptions": [
{
"lang": "en",
"value": "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---"
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"providerMetadata": {
"dateUpdated": "2026-05-23T15:19:51.664Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
{
"url": "https://git.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08"
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"url": "https://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf"
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"url": "https://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2"
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"title": "blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd",
"x_generator": {
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"cveMetadata": {
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"datePublished": "2024-05-21T15:03:41.677Z",
"dateReserved": "2024-05-21T14:58:30.811Z",
"dateUpdated": "2026-05-23T15:19:51.664Z",
"state": "PUBLISHED"
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"dataType": "CVE_RECORD",
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"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2021-47379",
"date": "2026-09-15",
"epss": "0.00253",
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"fkie_nvd": {
"configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionEndExcluding\": \"5.4.150\", \"matchCriteriaId\": \"F6EBA6BC-0594-4920-B410-5DDA60229E8E\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.5\", \"versionEndExcluding\": \"5.10.70\", \"matchCriteriaId\": \"A2A50090-4483-4F44-9147-BF0B012FBF7E\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.11\", \"versionEndExcluding\": \"5.14.9\", \"matchCriteriaId\": \"1B31D6C1-A751-438D-906B-0C56B789D498\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*\", \"matchCriteriaId\": \"E46C74C6-B76B-4C94-A6A4-FD2FFF62D644\"}]}]}]",
"descriptions": "[{\"lang\": \"en\", \"value\": \"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---\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se resolvi\\u00f3 la siguiente vulnerabilidad: blk-cgroup: corrige UAF capturando el bloqueo de blkcg antes de destruir blkg pd KASAN informa un informe de use after free al realizar una prueba fuzz: [693354.104835] ======= ==================================================== ========= [693354.105094] ERROR: KASAN: use after free en bfq_io_set_weight_legacy+0xd3/0x160 [693354.105336] Lectura de tama\\u00f1o 4 en la direcci\\u00f3n ffff888be0a35664 por tarea sh/1453338 [693354.10560 7] CPU: 41 PID: 1453338 Comm: sh Kdump: cargado No contaminado 4.18.0-147 [693354.105610] Nombre de hardware: Huawei 2288H V5/BC11SPSCB0, BIOS 0.81 02/07/2018 [693354.105612] Seguimiento de llamadas: [693354.105621] +0xf1/0x19b [693354.105626] ? show_regs_print_info+0x5/0x5 [693354.105634] ? imprimirk+0x9c/0xc3 [693354.105638] ? cpumask_weight+0x1f/0x1f [693354.105648] print_address_description+0x70/0x360 [693354.105654] kasan_report+0x1b2/0x330 [693354.105659] ? bfq_io_set_weight_legacy+0xd3/0x160 [693354.105665] ? bfq_io_set_weight_legacy+0xd3/0x160 [693354.105670] bfq_io_set_weight_legacy+0xd3/0x160 [693354.105675] ? bfq_cpd_init+0x20/0x20 [693354.105683] cgroup_file_write+0x3aa/0x510 [693354.105693] ? ___slab_alloc+0x507/0x540 [693354.105698] ? cgroup_file_poll+0x60/0x60 [693354.105702] ? 0xffffffff89600000 [693354.105708] ? usercopy_abort+0x90/0x90 [693354.105716] ? mutex_lock+0xef/0x180 [693354.105726] kernfs_fop_write+0x1ab/0x280 [693354.105732] ? cgroup_file_poll+0x60/0x60 [693354.105738] vfs_write+0xe7/0x230 [693354.105744] ksys_write+0xb0/0x140 [693354.105749] ? __ia32_sys_read+0x50/0x50 [693354.105760] do_syscall_64+0x112/0x370 [693354.105766] ? syscall_return_slowpath+0x260/0x260 [693354.105772]? do_page_fault+0x9b/0x270 [693354.105779] ? prepare_exit_to_usermode+0xf9/0x1a0 [693354.105784] ? enter_from_user_mode+0x30/0x30 [693354.105793] Entry_SYSCALL_64_after_hwframe+0x65/0xca [693354.105875] Asignado por la tarea 1453337: [693354.106001] kasan_kmalloc+0xa0/0xd0 [693354. 106006] kmem_cache_alloc_node_trace+0x108/0x220 [693354.106010] bfq_pd_alloc+0x96/0x120 [693354.106015] blkcg_activate_policy+ 0x1b7/0x2b0 [693354.106020] bfq_create_group_hierarchy+0x1e/0x80 [693354.106026] bfq_init_queue+0x678/0x8c0 [693354.106031] blk_mq_init_sched+0x1f8/0x460 [693354.106037] elevator_switch_mq+0xe1/0x240 [693354.106041] elevator_switch+0x25/0x40 [693354.106045] elv_iosched_store+0x1a1/ 0x230 [693354.106049] queue_attr_store+0x78/0xb0 [693354.106053] kernfs_fop_write+0x1ab/0x280 [693354.106056] vfs_write+0xe7/0x230 [693354.106060] s_write+0xb0/0x140 [693354.106064] do_syscall_64+0x112/0x370 [693354.106069] Entry_SYSCALL_64_after_hwframe+0x65/0xca [ 693354.106114] Liberado por la tarea 1453336: [693354.106225] __kasan_slab_free+0x130/0x180 [693354.106229] kfree+0x90/0x1b0 [693354.106233] blkcg_deactivate_policy+0x12 c/0x220 [693354.106238] bfq_exit_queue+0xf5/0x110 [693354.106241] blk_mq_exit_sched+0x104/0x130 [693354.106245] __elevator_exit+0x45/0x60 [693354.106249] elevator_switch_mq+0xd6/0x240 [693354.106253] interruptor_elevador+0x25/0x40 [693354.106257] elv_iosched_store+0x1a1/0x230 .106261] queue_attr_store+0x78/0xb0 [693354.106264] kernfs_fop_write+0x1ab/0x280 [693354.106268] vfs_write+ 0xe7/0x230 [693354.106271] ksys_write+0xb0/0x140 [693354.106275] do_syscall_64+0x112/0x370 [693354.106280] Entry_SYSCALL_64_after_hwframe+0x65/0xca [69335 4.106329] La direcci\\u00f3n con errores pertenece al objeto en ffff888be0a35580 que pertenece al cach\\u00e9 kmalloc-1k de tama\\u00f1o 1024 [693354.106736] La direcci\\u00f3n con errores se encuentra a 228 bytes dentro de la regi\\u00f3n de 1024 bytes [ffff888be0a35580, ffff888be0a35980) [693354.107114] La direcci\\u00f3n con errores pertenece a la p\\u00e1gina: [693354.107273] p\\u00e1gina:ffffea002f828c00 1 recuento de mapas: 0 mapeo: ffff888107c17080 \\u00edndice: 0x0 Compound_mapcount: 0 [693354.107606] banderas: 0x17ffffc0008100(slab|head) [693354.107760] raw: 0017ffffc0008100 ffffea002fcbc808 ffffea0030bd3a08 ffff888107c17080 3354.108020] r ---truncado---\"}]",
"id": "CVE-2021-47379",
"lastModified": "2024-12-23T20:47:30.867",
"metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"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\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.8, \"impactScore\": 5.9}]}",
"published": "2024-05-21T15:15:23.590",
"references": "[{\"url\": \"https://git.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fb\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fb\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}]",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}]"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2021-47379\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:23.590\",\"lastModified\":\"2026-06-17T04:17:20.083\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: blk-cgroup: corrige UAF capturando el bloqueo de blkcg antes de destruir blkg pd KASAN informa un informe de use after free al realizar una prueba fuzz: [693354.104835] ======= ==================================================== ========= [693354.105094] ERROR: KASAN: use after free en bfq_io_set_weight_legacy+0xd3/0x160 [693354.105336] Lectura de tama\u00f1o 4 en la direcci\u00f3n ffff888be0a35664 por tarea sh/1453338 [693354.10560 7] CPU: 41 PID: 1453338 Comm: sh Kdump: cargado No contaminado 4.18.0-147 [693354.105610] Nombre de hardware: Huawei 2288H V5/BC11SPSCB0, BIOS 0.81 02/07/2018 [693354.105612] Seguimiento de llamadas: [693354.105621] +0xf1/0x19b [693354.105626] ? show_regs_print_info+0x5/0x5 [693354.105634] ? imprimirk+0x9c/0xc3 [693354.105638] ? cpumask_weight+0x1f/0x1f [693354.105648] print_address_description+0x70/0x360 [693354.105654] kasan_report+0x1b2/0x330 [693354.105659] ? bfq_io_set_weight_legacy+0xd3/0x160 [693354.105665] ? bfq_io_set_weight_legacy+0xd3/0x160 [693354.105670] bfq_io_set_weight_legacy+0xd3/0x160 [693354.105675] ? bfq_cpd_init+0x20/0x20 [693354.105683] cgroup_file_write+0x3aa/0x510 [693354.105693] ? ___slab_alloc+0x507/0x540 [693354.105698] ? cgroup_file_poll+0x60/0x60 [693354.105702] ? 0xffffffff89600000 [693354.105708] ? usercopy_abort+0x90/0x90 [693354.105716] ? mutex_lock+0xef/0x180 [693354.105726] kernfs_fop_write+0x1ab/0x280 [693354.105732] ? cgroup_file_poll+0x60/0x60 [693354.105738] vfs_write+0xe7/0x230 [693354.105744] ksys_write+0xb0/0x140 [693354.105749] ? __ia32_sys_read+0x50/0x50 [693354.105760] do_syscall_64+0x112/0x370 [693354.105766] ? syscall_return_slowpath+0x260/0x260 [693354.105772]? do_page_fault+0x9b/0x270 [693354.105779] ? prepare_exit_to_usermode+0xf9/0x1a0 [693354.105784] ? enter_from_user_mode+0x30/0x30 [693354.105793] Entry_SYSCALL_64_after_hwframe+0x65/0xca [693354.105875] Asignado por la tarea 1453337: [693354.106001] kasan_kmalloc+0xa0/0xd0 [693354. 106006] kmem_cache_alloc_node_trace+0x108/0x220 [693354.106010] bfq_pd_alloc+0x96/0x120 [693354.106015] blkcg_activate_policy+ 0x1b7/0x2b0 [693354.106020] bfq_create_group_hierarchy+0x1e/0x80 [693354.106026] bfq_init_queue+0x678/0x8c0 [693354.106031] blk_mq_init_sched+0x1f8/0x460 [693354.106037] elevator_switch_mq+0xe1/0x240 [693354.106041] elevator_switch+0x25/0x40 [693354.106045] elv_iosched_store+0x1a1/ 0x230 [693354.106049] queue_attr_store+0x78/0xb0 [693354.106053] kernfs_fop_write+0x1ab/0x280 [693354.106056] vfs_write+0xe7/0x230 [693354.106060] s_write+0xb0/0x140 [693354.106064] do_syscall_64+0x112/0x370 [693354.106069] Entry_SYSCALL_64_after_hwframe+0x65/0xca [ 693354.106114] Liberado por la tarea 1453336: [693354.106225] __kasan_slab_free+0x130/0x180 [693354.106229] kfree+0x90/0x1b0 [693354.106233] blkcg_deactivate_policy+0x12 c/0x220 [693354.106238] bfq_exit_queue+0xf5/0x110 [693354.106241] blk_mq_exit_sched+0x104/0x130 [693354.106245] __elevator_exit+0x45/0x60 [693354.106249] elevator_switch_mq+0xd6/0x240 [693354.106253] interruptor_elevador+0x25/0x40 [693354.106257] elv_iosched_store+0x1a1/0x230 .106261] queue_attr_store+0x78/0xb0 [693354.106264] kernfs_fop_write+0x1ab/0x280 [693354.106268] vfs_write+ 0xe7/0x230 [693354.106271] ksys_write+0xb0/0x140 [693354.106275] do_syscall_64+0x112/0x370 [693354.106280] Entry_SYSCALL_64_after_hwframe+0x65/0xca [69335 4.106329] La direcci\u00f3n con errores pertenece al objeto en ffff888be0a35580 que pertenece al cach\u00e9 kmalloc-1k de tama\u00f1o 1024 [693354.106736] La direcci\u00f3n con errores se encuentra a 228 bytes dentro de la regi\u00f3n de 1024 bytes [ffff888be0a35580, ffff888be0a35980) [693354.107114] La direcci\u00f3n con errores pertenece a la p\u00e1gina: [693354.107273] p\u00e1gina:ffffea002f828c00 1 recuento de mapas: 0 mapeo: ffff888107c17080 \u00edndice: 0x0 Compound_mapcount: 0 [693354.107606] banderas: 0x17ffffc0008100(slab|head) [693354.107760] raw: 0017ffffc0008100 ffffea002fcbc808 ffffea0030bd3a08 ffff888107c17080 3354.108020] r ---truncado---\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"block/blk-cgroup.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"946b81da114b8ba5c74bb01e57c0c6eca2bdc801\",\"lessThan\":\"d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"946b81da114b8ba5c74bb01e57c0c6eca2bdc801\",\"lessThan\":\"f58d305887ad7b24986d58e881f6806bb81b2bdf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"946b81da114b8ba5c74bb01e57c0c6eca2bdc801\",\"lessThan\":\"7c2c69e010431b0157c9454adcdd2305809bf9fb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"946b81da114b8ba5c74bb01e57c0c6eca2bdc801\",\"lessThan\":\"858560b27645e7e97aca37ee8f232cccd658fbd2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9d5e2d69705fed4ab527f5a283b90ae602f4e0fd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3ca6e949b751fa3dfbf475ce635364cef543738b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4.14.51\",\"lessThan\":\"4.15\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.16.17\",\"lessThan\":\"4.17\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"block/blk-cgroup.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.150\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.70\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.14.9\",\"lessThanOrEqual\":\"5.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-06-11T18:56:11.466478Z\",\"id\":\"CVE-2021-47379\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"5.4.150\",\"matchCriteriaId\":\"F6EBA6BC-0594-4920-B410-5DDA60229E8E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.70\",\"matchCriteriaId\":\"A2A50090-4483-4F44-9147-BF0B012FBF7E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.14.9\",\"matchCriteriaId\":\"1B31D6C1-A751-438D-906B-0C56B789D498\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"E46C74C6-B76B-4C94-A6A4-FD2FFF62D644\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fb\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-02-02T10:51:33+00:00",
"cve": "CVE-2021-47379",
"id": "CVE-2021-47379",
"initial_release_date": "2021-01-01T00:00:00+00:00",
"product_status:known_affected": "42",
"product_status:known_not_affected": "156",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47379.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-05T17:10:26Z",
"cve": "CVE-2021-47379",
"id": "CVE-2021-47379",
"initial_release_date": "2024-05-24T15:21:28Z",
"product_status:known_affected": "390",
"product_status:known_not_affected": "67",
"product_status:recommended": "657",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2021-47379",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47379.json",
"version": "62"
},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fb\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:32:08.606Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47379\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-11T18:56:11.466478Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-11T18:56:18.935Z\"}}], \"cna\": {\"title\": \"blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"946b81da114b8ba5c74bb01e57c0c6eca2bdc801\", \"lessThan\": \"d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"946b81da114b8ba5c74bb01e57c0c6eca2bdc801\", \"lessThan\": \"f58d305887ad7b24986d58e881f6806bb81b2bdf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"946b81da114b8ba5c74bb01e57c0c6eca2bdc801\", \"lessThan\": \"7c2c69e010431b0157c9454adcdd2305809bf9fb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"946b81da114b8ba5c74bb01e57c0c6eca2bdc801\", \"lessThan\": \"858560b27645e7e97aca37ee8f232cccd658fbd2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9d5e2d69705fed4ab527f5a283b90ae602f4e0fd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3ca6e949b751fa3dfbf475ce635364cef543738b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4.14.51\", \"lessThan\": \"4.15\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.16.17\", \"lessThan\": \"4.17\", \"versionType\": \"semver\"}], \"programFiles\": [\"block/blk-cgroup.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.17\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.17\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.150\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.70\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.14.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"block/blk-cgroup.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08\"}, {\"url\": \"https://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf\"}, {\"url\": \"https://git.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fb\"}, {\"url\": \"https://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.150\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.70\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.9\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\", \"versionStartIncluding\": \"4.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.14.51\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.16.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:19:51.664Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2021-47379\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:19:51.664Z\", \"dateReserved\": \"2024-05-21T14:58:30.811Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T15:03:41.677Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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