CVE-2021-47387 (GCVE-0-2021-47387)
Vulnerability from cvelistv5
Published
2024-05-21 15:03
Modified
2025-05-04 07:09
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: cpufreq: schedutil: Use kobject release() method to free sugov_tunables The struct sugov_tunables is protected by the kobject, so we can't free it directly. Otherwise we would get a call trace like this: ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x30 WARNING: CPU: 3 PID: 720 at lib/debugobjects.c:505 debug_print_object+0xb8/0x100 Modules linked in: CPU: 3 PID: 720 Comm: a.sh Tainted: G W 5.14.0-rc1-next-20210715-yocto-standard+ #507 Hardware name: Marvell OcteonTX CN96XX board (DT) pstate: 40400009 (nZcv daif +PAN -UAO -TCO BTYPE=--) pc : debug_print_object+0xb8/0x100 lr : debug_print_object+0xb8/0x100 sp : ffff80001ecaf910 x29: ffff80001ecaf910 x28: ffff00011b10b8d0 x27: ffff800011043d80 x26: ffff00011a8f0000 x25: ffff800013cb3ff0 x24: 0000000000000000 x23: ffff80001142aa68 x22: ffff800011043d80 x21: ffff00010de46f20 x20: ffff800013c0c520 x19: ffff800011d8f5b0 x18: 0000000000000010 x17: 6e6968207473696c x16: 5f72656d6974203a x15: 6570797420746365 x14: 6a626f2029302065 x13: 303378302f307830 x12: 2b6e665f72656d69 x11: ffff8000124b1560 x10: ffff800012331520 x9 : ffff8000100ca6b0 x8 : 000000000017ffe8 x7 : c0000000fffeffff x6 : 0000000000000001 x5 : ffff800011d8c000 x4 : ffff800011d8c740 x3 : 0000000000000000 x2 : ffff0001108301c0 x1 : ab3c90eedf9c0f00 x0 : 0000000000000000 Call trace: debug_print_object+0xb8/0x100 __debug_check_no_obj_freed+0x1c0/0x230 debug_check_no_obj_freed+0x20/0x88 slab_free_freelist_hook+0x154/0x1c8 kfree+0x114/0x5d0 sugov_exit+0xbc/0xc0 cpufreq_exit_governor+0x44/0x90 cpufreq_set_policy+0x268/0x4a8 store_scaling_governor+0xe0/0x128 store+0xc0/0xf0 sysfs_kf_write+0x54/0x80 kernfs_fop_write_iter+0x128/0x1c0 new_sync_write+0xf0/0x190 vfs_write+0x2d4/0x478 ksys_write+0x74/0x100 __arm64_sys_write+0x24/0x30 invoke_syscall.constprop.0+0x54/0xe0 do_el0_svc+0x64/0x158 el0_svc+0x2c/0xb0 el0t_64_sync_handler+0xb0/0xb8 el0t_64_sync+0x198/0x19c irq event stamp: 5518 hardirqs last enabled at (5517): [<ffff8000100cbd7c>] console_unlock+0x554/0x6c8 hardirqs last disabled at (5518): [<ffff800010fc0638>] el1_dbg+0x28/0xa0 softirqs last enabled at (5504): [<ffff8000100106e0>] __do_softirq+0x4d0/0x6c0 softirqs last disabled at (5483): [<ffff800010049548>] irq_exit+0x1b0/0x1b8 So split the original sugov_tunables_free() into two functions, sugov_clear_global_tunables() is just used to clear the global_tunables and the new sugov_tunables_free() is used as kobj_type::release to release the sugov_tunables safely.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/30d57cf2c4116ca6d34ecd1cac94ad84f8bc446c Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/463c46705f321201090b69c4ad5da0cd2ce614c9 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/67c98e023135ff81b8d52998a6fdb8ca0c518d82 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/8d62aec52a8c5b1d25a2364b243fcc5098a2ede9 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/a7d4fc84404d45d72f4490417e8cc3efa4af93f1 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/cb4a53ba37532c861a5f3f22803391018a41849a Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/e5c6b312ce3cc97e90ea159446e6bfa06645364d Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/30d57cf2c4116ca6d34ecd1cac94ad84f8bc446c Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/463c46705f321201090b69c4ad5da0cd2ce614c9 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/67c98e023135ff81b8d52998a6fdb8ca0c518d82 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/8d62aec52a8c5b1d25a2364b243fcc5098a2ede9 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/a7d4fc84404d45d72f4490417e8cc3efa4af93f1 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/cb4a53ba37532c861a5f3f22803391018a41849a Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/e5c6b312ce3cc97e90ea159446e6bfa06645364d Patch
Impacted products
Vendor Product Version
Linux Linux Version: 9bdcb44e391da5c41b98573bf0305a0e0b1c9569
Version: 9bdcb44e391da5c41b98573bf0305a0e0b1c9569
Version: 9bdcb44e391da5c41b98573bf0305a0e0b1c9569
Version: 9bdcb44e391da5c41b98573bf0305a0e0b1c9569
Version: 9bdcb44e391da5c41b98573bf0305a0e0b1c9569
Version: 9bdcb44e391da5c41b98573bf0305a0e0b1c9569
Version: 9bdcb44e391da5c41b98573bf0305a0e0b1c9569
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    "datePublished": "2024-05-21T15:03:46.925Z",
    "dateReserved": "2024-05-21T14:58:30.813Z",
    "dateUpdated": "2025-05-04T07:09:51.475Z",
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47387\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:24.183\",\"lastModified\":\"2025-09-25T15:38:17.343\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncpufreq: schedutil: Use kobject release() method to free sugov_tunables\\n\\nThe struct sugov_tunables is protected by the kobject, so we can\u0027t free\\nit directly. Otherwise we would get a call trace like this:\\n  ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x30\\n  WARNING: CPU: 3 PID: 720 at lib/debugobjects.c:505 debug_print_object+0xb8/0x100\\n  Modules linked in:\\n  CPU: 3 PID: 720 Comm: a.sh Tainted: G        W         5.14.0-rc1-next-20210715-yocto-standard+ #507\\n  Hardware name: Marvell OcteonTX CN96XX board (DT)\\n  pstate: 40400009 (nZcv daif +PAN -UAO -TCO BTYPE=--)\\n  pc : debug_print_object+0xb8/0x100\\n  lr : debug_print_object+0xb8/0x100\\n  sp : ffff80001ecaf910\\n  x29: ffff80001ecaf910 x28: ffff00011b10b8d0 x27: ffff800011043d80\\n  x26: ffff00011a8f0000 x25: ffff800013cb3ff0 x24: 0000000000000000\\n  x23: ffff80001142aa68 x22: ffff800011043d80 x21: ffff00010de46f20\\n  x20: ffff800013c0c520 x19: ffff800011d8f5b0 x18: 0000000000000010\\n  x17: 6e6968207473696c x16: 5f72656d6974203a x15: 6570797420746365\\n  x14: 6a626f2029302065 x13: 303378302f307830 x12: 2b6e665f72656d69\\n  x11: ffff8000124b1560 x10: ffff800012331520 x9 : ffff8000100ca6b0\\n  x8 : 000000000017ffe8 x7 : c0000000fffeffff x6 : 0000000000000001\\n  x5 : ffff800011d8c000 x4 : ffff800011d8c740 x3 : 0000000000000000\\n  x2 : ffff0001108301c0 x1 : ab3c90eedf9c0f00 x0 : 0000000000000000\\n  Call trace:\\n   debug_print_object+0xb8/0x100\\n   __debug_check_no_obj_freed+0x1c0/0x230\\n   debug_check_no_obj_freed+0x20/0x88\\n   slab_free_freelist_hook+0x154/0x1c8\\n   kfree+0x114/0x5d0\\n   sugov_exit+0xbc/0xc0\\n   cpufreq_exit_governor+0x44/0x90\\n   cpufreq_set_policy+0x268/0x4a8\\n   store_scaling_governor+0xe0/0x128\\n   store+0xc0/0xf0\\n   sysfs_kf_write+0x54/0x80\\n   kernfs_fop_write_iter+0x128/0x1c0\\n   new_sync_write+0xf0/0x190\\n   vfs_write+0x2d4/0x478\\n   ksys_write+0x74/0x100\\n   __arm64_sys_write+0x24/0x30\\n   invoke_syscall.constprop.0+0x54/0xe0\\n   do_el0_svc+0x64/0x158\\n   el0_svc+0x2c/0xb0\\n   el0t_64_sync_handler+0xb0/0xb8\\n   el0t_64_sync+0x198/0x19c\\n  irq event stamp: 5518\\n  hardirqs last  enabled at (5517): [\u003cffff8000100cbd7c\u003e] console_unlock+0x554/0x6c8\\n  hardirqs last disabled at (5518): [\u003cffff800010fc0638\u003e] el1_dbg+0x28/0xa0\\n  softirqs last  enabled at (5504): [\u003cffff8000100106e0\u003e] __do_softirq+0x4d0/0x6c0\\n  softirqs last disabled at (5483): [\u003cffff800010049548\u003e] irq_exit+0x1b0/0x1b8\\n\\nSo split the original sugov_tunables_free() into two functions,\\nsugov_clear_global_tunables() is just used to clear the global_tunables\\nand the new sugov_tunables_free() is used as kobj_type::release to\\nrelease the sugov_tunables safely.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cpufreq: schedutil: utilice el m\u00e9todo kobject release() para liberar sugov_tunables. La estructura sugov_tunables est\u00e1 protegida por kobject, por lo que no podemos liberarla directamente. De lo contrario, obtendr\u00edamos un seguimiento de llamada como este: ODEBUG: activo libre (estado activo 0) tipo de objeto: timer_list sugerencia: delay_work_timer_fn+0x0/0x30 ADVERTENCIA: CPU: 3 PID: 720 en lib/debugobjects.c:505 debug_print_object+0xb8/ 0x100 M\u00f3dulos vinculados en: CPU: 3 PID: 720 Comm: a.sh Contaminado: GW 5.14.0-rc1-next-20210715-yocto-standard+ #507 Nombre del hardware: Placa Marvell OcteonTX CN96XX (DT) pstate: 40400009 (nZcv daif +PAN -UAO -TCO BTYPE=--) pc: debug_print_object+0xb8/0x100 lr: debug_print_object+0xb8/0x100 sp: ffff80001ecaf910 x29: ffff80001ecaf910 x28: ffff00011b10b8d0 x27: d80 x26: ffff00011a8f0000 x25: ffff800013cb3ff0 x24: 0000000000000000 x23: ffff80001142aa68 x22 : ffff800011043d80 x21: ffff00010de46f20 x20: ffff800013c0c520 x19: ffff800011d8f5b0 x18: 0000000000000010 x17: 6e6968207473696c x16: 656d6974203a x15: 6570797420746365 x14: 6a626f2029302065 x13: 303378302f307830 x12: 2b6e665f72656d69 x11: ffff8000124b1560 x10: 0012331520 x9: ffff8000100ca6b0 x8: 000000000017ffe8 x7: c0000000fffeffff x6: 0000000000000001 x5: ffff800011d8c000 x4: ffff800011d8c740 x3: 0000000000000000 x2: ffff0001108301c0 x1: ab3c90eedf9c0f00 x0: 0000000000000000 Rastreo de llamadas: xb8/0x100 __debug_check_no_obj_freed+0x1c0/0x230 debug_check_no_obj_freed+0x20/0x88 slab_free_freelist_hook+0x154/0x1c8 kfree+0x114/0x5d0 sugov_exit+0xbc/ 0xc0 cpufreq_exit_governor+0x44/0x90 cpufreq_set_policy+0x268/0x4a8 store_scaling_governor+0xe0/0x128 store+0xc0/0xf0 sysfs_kf_write+0x54/0x80 kernfs_fop_write_iter+0x128/0x1c0 nuevo _sync_write+0xf0/0x190 vfs_write+0x2d4/0x478 ksys_write+0x74/0x100 __arm64_sys_write+0x24/ 0x30 invoke_syscall.constprop.0+0x54/0xe0 do_el0_svc+0x64/0x158 el0_svc+0x2c/0xb0 el0t_64_sync_handler+0xb0/0xb8 el0t_64_sync+0x198/0x19c sello de evento irq: 5518 hardirqs habilitado por \u00faltima vez en ( 5517): [] consola_unlock+ 0x554/0x6c8 hardirqs deshabilitado por \u00faltima vez en (5518): [] el1_dbg+0x28/0xa0 softirqs habilitado por \u00faltima vez en (5504): [] __do_softirq+0x4d0/0x6c0 softirqs deshabilitado por \u00faltima vez en (5483): ff800010049548 \u0026gt;] irq_exit+0x1b0/0x1b8 Entonces divida el sugov_tunables_free() original en dos funciones, sugov_clear_global_tunables() solo se usa para borrar los global_tunables y el nuevo sugov_tunables_free() se usa como kobj_type::release para liberar los sugov_tunables de forma segura.\"}],\"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:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-763\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.7\",\"versionEndExcluding\":\"4.9.285\",\"matchCriteriaId\":\"71D61395-0228-4BB6-9B08-38F445F83B82\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.10\",\"versionEndExcluding\":\"4.14.249\",\"matchCriteriaId\":\"9DFC8239-9F26-43B2-A340-8EFC6BC6BDA8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.15\",\"versionEndExcluding\":\"4.19.209\",\"matchCriteriaId\":\"21C23429-F802-4256-B3C2-9EEA76AC11FF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.151\",\"matchCriteriaId\":\"BFFC8E38-107A-4B6F-9FFD-9B2FD8B89EF0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.71\",\"matchCriteriaId\":\"60C740E4-6C54-40CD-A914-2232D8FC781D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.14.10\",\"matchCriteriaId\":\"1A437B0D-8305-4C72-B691-D26986A126CF\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/30d57cf2c4116ca6d34ecd1cac94ad84f8bc446c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/463c46705f321201090b69c4ad5da0cd2ce614c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/67c98e023135ff81b8d52998a6fdb8ca0c518d82\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8d62aec52a8c5b1d25a2364b243fcc5098a2ede9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a7d4fc84404d45d72f4490417e8cc3efa4af93f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cb4a53ba37532c861a5f3f22803391018a41849a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e5c6b312ce3cc97e90ea159446e6bfa06645364d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/30d57cf2c4116ca6d34ecd1cac94ad84f8bc446c\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/463c46705f321201090b69c4ad5da0cd2ce614c9\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/67c98e023135ff81b8d52998a6fdb8ca0c518d82\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8d62aec52a8c5b1d25a2364b243fcc5098a2ede9\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a7d4fc84404d45d72f4490417e8cc3efa4af93f1\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cb4a53ba37532c861a5f3f22803391018a41849a\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e5c6b312ce3cc97e90ea159446e6bfa06645364d\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
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\"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:39:59.003Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47387\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-11T18:55:39.448369Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-11T18:55:46.372Z\"}}], \"cna\": {\"title\": \"cpufreq: schedutil: Use kobject release() method to free sugov_tunables\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"9bdcb44e391da5c41b98573bf0305a0e0b1c9569\", \"lessThan\": 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{\"status\": \"unaffected\", \"version\": \"5.10.71\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.14.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/sched/cpufreq_schedutil.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/cb4a53ba37532c861a5f3f22803391018a41849a\"}, {\"url\": \"https://git.kernel.org/stable/c/463c46705f321201090b69c4ad5da0cd2ce614c9\"}, {\"url\": \"https://git.kernel.org/stable/c/30d57cf2c4116ca6d34ecd1cac94ad84f8bc446c\"}, {\"url\": \"https://git.kernel.org/stable/c/67c98e023135ff81b8d52998a6fdb8ca0c518d82\"}, {\"url\": \"https://git.kernel.org/stable/c/a7d4fc84404d45d72f4490417e8cc3efa4af93f1\"}, {\"url\": \"https://git.kernel.org/stable/c/8d62aec52a8c5b1d25a2364b243fcc5098a2ede9\"}, {\"url\": \"https://git.kernel.org/stable/c/e5c6b312ce3cc97e90ea159446e6bfa06645364d\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncpufreq: schedutil: Use kobject release() method to free sugov_tunables\\n\\nThe struct sugov_tunables is protected by the kobject, so we can\u0027t free\\nit directly. Otherwise we would get a call trace like this:\\n  ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x30\\n  WARNING: CPU: 3 PID: 720 at lib/debugobjects.c:505 debug_print_object+0xb8/0x100\\n  Modules linked in:\\n  CPU: 3 PID: 720 Comm: a.sh Tainted: G        W         5.14.0-rc1-next-20210715-yocto-standard+ #507\\n  Hardware name: Marvell OcteonTX CN96XX board (DT)\\n  pstate: 40400009 (nZcv daif +PAN -UAO -TCO BTYPE=--)\\n  pc : debug_print_object+0xb8/0x100\\n  lr : debug_print_object+0xb8/0x100\\n  sp : ffff80001ecaf910\\n  x29: ffff80001ecaf910 x28: ffff00011b10b8d0 x27: ffff800011043d80\\n  x26: ffff00011a8f0000 x25: ffff800013cb3ff0 x24: 0000000000000000\\n  x23: ffff80001142aa68 x22: ffff800011043d80 x21: ffff00010de46f20\\n  x20: ffff800013c0c520 x19: ffff800011d8f5b0 x18: 0000000000000010\\n  x17: 6e6968207473696c x16: 5f72656d6974203a x15: 6570797420746365\\n  x14: 6a626f2029302065 x13: 303378302f307830 x12: 2b6e665f72656d69\\n  x11: ffff8000124b1560 x10: ffff800012331520 x9 : ffff8000100ca6b0\\n  x8 : 000000000017ffe8 x7 : c0000000fffeffff x6 : 0000000000000001\\n  x5 : ffff800011d8c000 x4 : ffff800011d8c740 x3 : 0000000000000000\\n  x2 : ffff0001108301c0 x1 : ab3c90eedf9c0f00 x0 : 0000000000000000\\n  Call trace:\\n   debug_print_object+0xb8/0x100\\n   __debug_check_no_obj_freed+0x1c0/0x230\\n   debug_check_no_obj_freed+0x20/0x88\\n   slab_free_freelist_hook+0x154/0x1c8\\n   kfree+0x114/0x5d0\\n   sugov_exit+0xbc/0xc0\\n   cpufreq_exit_governor+0x44/0x90\\n   cpufreq_set_policy+0x268/0x4a8\\n   store_scaling_governor+0xe0/0x128\\n   store+0xc0/0xf0\\n   sysfs_kf_write+0x54/0x80\\n   kernfs_fop_write_iter+0x128/0x1c0\\n   new_sync_write+0xf0/0x190\\n   vfs_write+0x2d4/0x478\\n   ksys_write+0x74/0x100\\n   __arm64_sys_write+0x24/0x30\\n   invoke_syscall.constprop.0+0x54/0xe0\\n   do_el0_svc+0x64/0x158\\n   el0_svc+0x2c/0xb0\\n   el0t_64_sync_handler+0xb0/0xb8\\n   el0t_64_sync+0x198/0x19c\\n  irq event stamp: 5518\\n  hardirqs last  enabled at (5517): [\u003cffff8000100cbd7c\u003e] console_unlock+0x554/0x6c8\\n  hardirqs last disabled at (5518): [\u003cffff800010fc0638\u003e] el1_dbg+0x28/0xa0\\n  softirqs last  enabled at (5504): [\u003cffff8000100106e0\u003e] __do_softirq+0x4d0/0x6c0\\n  softirqs last disabled at (5483): [\u003cffff800010049548\u003e] irq_exit+0x1b0/0x1b8\\n\\nSo split the original sugov_tunables_free() into two functions,\\nsugov_clear_global_tunables() is just used to clear the global_tunables\\nand the new sugov_tunables_free() is used as kobj_type::release to\\nrelease the sugov_tunables safely.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.285\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.249\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.209\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.151\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.71\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.10\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\", \"versionStartIncluding\": \"4.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:09:51.475Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47387\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:09:51.475Z\", \"dateReserved\": \"2024-05-21T14:58:30.813Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T15:03:46.925Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}