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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
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        "summary": "Canonical URL",
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          "date": "2021-01-01T00:00:00Z",
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          "text": "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't 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): [<ffff8000100cbd7c>] console_unlock+0x554/0x6c8\n  hardirqs last disabled at (5518): [<ffff800010fc0638>] el1_dbg+0x28/0xa0\n  softirqs last  enabled at (5504): [<ffff8000100106e0>] __do_softirq+0x4d0/0x6c0\n  softirqs last disabled at (5483): [<ffff800010049548>] 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.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "known_affected": [
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2021-47387"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/30d57cf2c4116ca6d34ecd1cac94ad84f8bc446c",
          "url": "https://git.kernel.org/stable/c/30d57cf2c4116ca6d34ecd1cac94ad84f8bc446c"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/463c46705f321201090b69c4ad5da0cd2ce614c9",
          "url": "https://git.kernel.org/stable/c/463c46705f321201090b69c4ad5da0cd2ce614c9"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/67c98e023135ff81b8d52998a6fdb8ca0c518d82",
          "url": "https://git.kernel.org/stable/c/67c98e023135ff81b8d52998a6fdb8ca0c518d82"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/8d62aec52a8c5b1d25a2364b243fcc5098a2ede9",
          "url": "https://git.kernel.org/stable/c/8d62aec52a8c5b1d25a2364b243fcc5098a2ede9"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/a7d4fc84404d45d72f4490417e8cc3efa4af93f1",
          "url": "https://git.kernel.org/stable/c/a7d4fc84404d45d72f4490417e8cc3efa4af93f1"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/cb4a53ba37532c861a5f3f22803391018a41849a",
          "url": "https://git.kernel.org/stable/c/cb4a53ba37532c861a5f3f22803391018a41849a"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/e5c6b312ce3cc97e90ea159446e6bfa06645364d",
          "url": "https://git.kernel.org/stable/c/e5c6b312ce3cc97e90ea159446e6bfa06645364d"
        }
      ],
      "release_date": "2024-05-21T15:15:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-07-17T19:05:42.262645Z",
          "details": "This is a local-only flaw in the cpufreq “schedutil” governor’s kobject teardown that is reachable by writing to cpufreq sysfs attributes (such as scaling_governor), which by default require root/CAP_SYS_ADMIN. Impact is limited to availability (kernel WARN/OOPS) with no confidentiality or integrity risk, and it further requires the cpufreq subsystem with the schedutil governor to be enabled and actively reconfigured. Given these constraints—and that systems without cpufreq access or without runtime governor changes are not exposed—this is low risk in managed enterprise VM/server deployments and can be safely deprioritized.",
          "product_ids": [
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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}