{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.1",
    "cveMetadata": {
        "cveId": "CVE-2021-47488",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2024-05-22T06:20:56.201Z",
        "datePublished": "2024-05-22T08:19:38.117Z",
        "dateUpdated": "2024-09-11T17:32:53.086Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2024-05-29T05:08:50.120Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncgroup: Fix memory leak caused by missing cgroup_bpf_offline\n\nWhen enabling CONFIG_CGROUP_BPF, kmemleak can be observed by running\nthe command as below:\n\n    $mount -t cgroup -o none,name=foo cgroup cgroup/\n    $umount cgroup/\n\nunreferenced object 0xc3585c40 (size 64):\n  comm \"mount\", pid 425, jiffies 4294959825 (age 31.990s)\n  hex dump (first 32 bytes):\n    01 00 00 80 84 8c 28 c0 00 00 00 00 00 00 00 00  ......(.........\n    00 00 00 00 00 00 00 00 6c 43 a0 c3 00 00 00 00  ........lC......\n  backtrace:\n    [<e95a2f9e>] cgroup_bpf_inherit+0x44/0x24c\n    [<1f03679c>] cgroup_setup_root+0x174/0x37c\n    [<ed4b0ac5>] cgroup1_get_tree+0x2c0/0x4a0\n    [<f85b12fd>] vfs_get_tree+0x24/0x108\n    [<f55aec5c>] path_mount+0x384/0x988\n    [<e2d5e9cd>] do_mount+0x64/0x9c\n    [<208c9cfe>] sys_mount+0xfc/0x1f4\n    [<06dd06e0>] ret_fast_syscall+0x0/0x48\n    [<a8308cb3>] 0xbeb4daa8\n\nThis is because that since the commit 2b0d3d3e4fcf (\"percpu_ref: reduce\nmemory footprint of percpu_ref in fast path\") root_cgrp->bpf.refcnt.data\nis allocated by the function percpu_ref_init in cgroup_bpf_inherit which\nis called by cgroup_setup_root when mounting, but not freed along with\nroot_cgrp when umounting. Adding cgroup_bpf_offline which calls\npercpu_ref_kill to cgroup_kill_sb can free root_cgrp->bpf.refcnt.data in\numount path.\n\nThis patch also fixes the commit 4bfc0bb2c60e (\"bpf: decouple the lifetime\nof cgroup_bpf from cgroup itself\"). A cgroup_bpf_offline is needed to do a\ncleanup that frees the resources which are allocated by cgroup_bpf_inherit\nin cgroup_setup_root.\n\nAnd inside cgroup_bpf_offline, cgroup_get() is at the beginning and\ncgroup_put is at the end of cgroup_bpf_release which is called by\ncgroup_bpf_offline. So cgroup_bpf_offline can keep the balance of\ncgroup's refcount."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/cgroup/cgroup.c"
                    ],
                    "versions": [
                        {
                            "version": "4bfc0bb2c60e",
                            "lessThan": "01599bf7cc2b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4bfc0bb2c60e",
                            "lessThan": "b529f88d9388",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4bfc0bb2c60e",
                            "lessThan": "04f8ef5643bc",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/cgroup/cgroup.c"
                    ],
                    "versions": [
                        {
                            "version": "5.3",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.3",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "5.10.77",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "5.14.16",
                            "lessThanOrEqual": "5.14.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "5.15",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/01599bf7cc2b49c3d2be886cb438647dc25446ed"
                },
                {
                    "url": "https://git.kernel.org/stable/c/b529f88d93884cf8ccafda793ee3d27b82fa578d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/04f8ef5643bcd8bcde25dfdebef998aea480b2ba"
                }
            ],
            "title": "cgroup: Fix memory leak caused by missing cgroup_bpf_offline",
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                "engine": "bippy-a5840b7849dd"
            }
        },
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                    "dateUpdated": "2024-08-04T05:39:59.588Z"
                },
                "title": "CVE Program Container",
                "references": [
                    {
                        "url": "https://git.kernel.org/stable/c/01599bf7cc2b49c3d2be886cb438647dc25446ed",
                        "tags": [
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                        "url": "https://git.kernel.org/stable/c/b529f88d93884cf8ccafda793ee3d27b82fa578d",
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                "metrics": [
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                        "other": {
                            "type": "ssvc",
                            "content": {
                                "id": "CVE-2021-47488",
                                "role": "CISA Coordinator",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
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                                        "Automatable": "no"
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                                        "Technical Impact": "partial"
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                                ],
                                "version": "2.0.3",
                                "timestamp": "2024-09-10T15:35:55.494242Z"
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