CVE-2021-47387 (GCVE-0-2021-47387)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:03 – Updated: 2025-05-04 07:09
VLAI?
Title
cpufreq: schedutil: Use kobject release() method to free sugov_tunables
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9bdcb44e391da5c41b98573bf0305a0e0b1c9569 , < cb4a53ba37532c861a5f3f22803391018a41849a (git)
Affected: 9bdcb44e391da5c41b98573bf0305a0e0b1c9569 , < 463c46705f321201090b69c4ad5da0cd2ce614c9 (git)
Affected: 9bdcb44e391da5c41b98573bf0305a0e0b1c9569 , < 30d57cf2c4116ca6d34ecd1cac94ad84f8bc446c (git)
Affected: 9bdcb44e391da5c41b98573bf0305a0e0b1c9569 , < 67c98e023135ff81b8d52998a6fdb8ca0c518d82 (git)
Affected: 9bdcb44e391da5c41b98573bf0305a0e0b1c9569 , < a7d4fc84404d45d72f4490417e8cc3efa4af93f1 (git)
Affected: 9bdcb44e391da5c41b98573bf0305a0e0b1c9569 , < 8d62aec52a8c5b1d25a2364b243fcc5098a2ede9 (git)
Affected: 9bdcb44e391da5c41b98573bf0305a0e0b1c9569 , < e5c6b312ce3cc97e90ea159446e6bfa06645364d (git)
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    Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (semver)
Unaffected: 4.9.285 , ≤ 4.9.* (semver)
Unaffected: 4.14.249 , ≤ 4.14.* (semver)
Unaffected: 4.19.209 , ≤ 4.19.* (semver)
Unaffected: 5.4.151 , ≤ 5.4.* (semver)
Unaffected: 5.10.71 , ≤ 5.10.* (semver)
Unaffected: 5.14.10 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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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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\"9bdcb44e391da5c41b98573bf0305a0e0b1c9569\", \"lessThan\": \"e5c6b312ce3cc97e90ea159446e6bfa06645364d\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/sched/cpufreq_schedutil.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.9.285\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.249\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.209\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.151\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"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"
    }
  }
}


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Sightings

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  • 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.



Detection rules are retrieved from Rulezet.