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

Vulnerability from cvelistv5 – Published: 2024-05-21 15:03 – Updated: 2026-05-11 13:53
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.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-11 18:55 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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        {
          "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."
        }
      ],
      "id": "CVE-2021-47387",
      "lastModified": "2024-11-21T06:36:02.443",
      "published": "2024-05-21T15:15:24.183",
      "references": [
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/30d57cf2c4116ca6d34ecd1cac94ad84f8bc446c"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/463c46705f321201090b69c4ad5da0cd2ce614c9"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/67c98e023135ff81b8d52998a6fdb8ca0c518d82"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/8d62aec52a8c5b1d25a2364b243fcc5098a2ede9"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/a7d4fc84404d45d72f4490417e8cc3efa4af93f1"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/cb4a53ba37532c861a5f3f22803391018a41849a"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/e5c6b312ce3cc97e90ea159446e6bfa06645364d"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/30d57cf2c4116ca6d34ecd1cac94ad84f8bc446c"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/463c46705f321201090b69c4ad5da0cd2ce614c9"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/67c98e023135ff81b8d52998a6fdb8ca0c518d82"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/8d62aec52a8c5b1d25a2364b243fcc5098a2ede9"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/a7d4fc84404d45d72f4490417e8cc3efa4af93f1"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/cb4a53ba37532c861a5f3f22803391018a41849a"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/e5c6b312ce3cc97e90ea159446e6bfa06645364d"
        }
      ],
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Awaiting Analysis"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "kernel/sched/cpufreq_schedutil.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "cb4a53ba37532c861a5f3f22803391018a41849a",
                    "status": "affected",
                    "version": "9bdcb44e391da5c41b98573bf0305a0e0b1c9569",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "463c46705f321201090b69c4ad5da0cd2ce614c9",
                    "status": "affected",
                    "version": "9bdcb44e391da5c41b98573bf0305a0e0b1c9569",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "30d57cf2c4116ca6d34ecd1cac94ad84f8bc446c",
                    "status": "affected",
                    "version": "9bdcb44e391da5c41b98573bf0305a0e0b1c9569",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "67c98e023135ff81b8d52998a6fdb8ca0c518d82",
                    "status": "affected",
                    "version": "9bdcb44e391da5c41b98573bf0305a0e0b1c9569",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "a7d4fc84404d45d72f4490417e8cc3efa4af93f1",
                    "status": "affected",
                    "version": "9bdcb44e391da5c41b98573bf0305a0e0b1c9569",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "8d62aec52a8c5b1d25a2364b243fcc5098a2ede9",
                    "status": "affected",
                    "version": "9bdcb44e391da5c41b98573bf0305a0e0b1c9569",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "e5c6b312ce3cc97e90ea159446e6bfa06645364d",
                    "status": "affected",
                    "version": "9bdcb44e391da5c41b98573bf0305a0e0b1c9569",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "kernel/sched/cpufreq_schedutil.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "4.7"
                  },
                  {
                    "lessThan": "4.7",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "4.9.*",
                    "status": "unaffected",
                    "version": "4.9.285",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "4.14.*",
                    "status": "unaffected",
                    "version": "4.14.249",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "4.19.*",
                    "status": "unaffected",
                    "version": "4.19.209",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.4.*",
                    "status": "unaffected",
                    "version": "5.4.151",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.71",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.14.*",
                    "status": "unaffected",
                    "version": "5.14.10",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "5.15",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "71D61395-0228-4BB6-9B08-38F445F83B82",
                    "versionEndExcluding": "4.9.285",
                    "versionStartIncluding": "4.7",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "9DFC8239-9F26-43B2-A340-8EFC6BC6BDA8",
                    "versionEndExcluding": "4.14.249",
                    "versionStartIncluding": "4.10",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "21C23429-F802-4256-B3C2-9EEA76AC11FF",
                    "versionEndExcluding": "4.19.209",
                    "versionStartIncluding": "4.15",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "BFFC8E38-107A-4B6F-9FFD-9B2FD8B89EF0",
                    "versionEndExcluding": "5.4.151",
                    "versionStartIncluding": "4.20",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "60C740E4-6C54-40CD-A914-2232D8FC781D",
                    "versionEndExcluding": "5.10.71",
                    "versionStartIncluding": "5.5",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "1A437B0D-8305-4C72-B691-D26986A126CF",
                    "versionEndExcluding": "5.14.10",
                    "versionStartIncluding": "5.11",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "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."
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        "id": "CVE-2021-47387",
        "lastModified": "2026-06-17T04:17:21.187",
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                  "versionType": "original_commit_for_fix"
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              "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."
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              "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"
            }
          ],
          "title": "cpufreq: schedutil: Use kobject release() method to free sugov_tunables",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47387",
        "datePublished": "2024-05-21T15:03:46.925Z",
        "dateReserved": "2024-05-21T14:58:30.813Z",
        "dateUpdated": "2025-05-04T07:09:51.475Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.