{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2024-49956",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2024-10-21T12:17:06.048Z",
        "datePublished": "2024-10-21T18:02:10.385Z",
        "dateUpdated": "2026-08-05T11:40:40.767Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T11:40:40.767Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: fix double destroy_workqueue error\n\nWhen gfs2_fill_super() fails, destroy_workqueue() is called within\ngfs2_gl_hash_clear(), and the subsequent code path calls\ndestroy_workqueue() on the same work queue again.\n\nThis issue can be fixed by setting the work queue pointer to NULL after\nthe first destroy_workqueue() call and checking for a NULL pointer\nbefore attempting to destroy the work queue again."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The vulnerability is reached only through the local mount path (`get_tree_bdev` → `gfs2_fill_super`) acting on a block device or image file present on the system. There is no network-facing consumer of this code.\nAC:L - Any `gfs2_fill_super()` failure at or after `init_locking()` deterministically reaches the double `destroy_workqueue()`; a crafted image that passes `gfs2_check_sb()` but fails in `init_sb()` triggers it on every attempt with no race or memory-layout precondition. syzbot produced a reliable reproducer.\nPR:N - The attacker needs no privileges on the target — they only supply the malformed GFS2 image (removable media, downloaded image file, or attacker-controlled shared/SAN storage). The privilege for the mount itself belongs to the victim, not the attacker.\nUI:R - A privileged user or an automount/storage-management daemon must mount the attacker-supplied GFS2 volume for `gfs2_fill_super()` to run and fail.\nS:U - The corruption is confined to kernel memory and kernel workqueue state within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The second `destroy_workqueue()` runs on a freed `workqueue_struct`, reading `flags`, `rescuer`, `pwqs`, and `cpu_pwq` from memory an attacker can reclaim via heap spraying, and using those values to drive kfree/kthread/list operations — a use-after-free read primitive leading to kernel memory disclosure.\nI:H - The use-after-free yields write primitives into the reclaimed object — `wq->flags |= __WQ_DESTROYING`, `list_del_rcu(&wq->list)` writing through attacker-influenced `prev`/`next` pointers, plus `kfree(wq->wq_dev)` and `kfree(rescuer)` on controlled pointers — sufficient for heap manipulation and control-flow hijack.\nA:H - Even absent reallocation, the second `list_del_rcu()` corrupts the global `workqueues` list and dereferences `LIST_POISON2`, producing a guaranteed kernel oops/panic; workqueue-core corruption also destabilizes the whole system."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/gfs2/glock.c",
                        "fs/gfs2/ops_fstype.c"
                    ],
                    "versions": [
                        {
                            "version": "30e388d573673474cbd089dec83688331c117add",
                            "lessThan": "a5336035728d77efd76306940d742a6f23debe68",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "30e388d573673474cbd089dec83688331c117add",
                            "lessThan": "6cb9df81a2c462b89d2f9611009ab43ae8717841",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/gfs2/glock.c",
                        "fs/gfs2/ops_fstype.c"
                    ],
                    "versions": [
                        {
                            "version": "6.11",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.11",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.11.3",
                            "lessThanOrEqual": "6.11.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.11",
                                    "versionEndExcluding": "6.11.3"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.11",
                                    "versionEndExcluding": "6.12"
                                }
                            ]
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                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/a5336035728d77efd76306940d742a6f23debe68"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6cb9df81a2c462b89d2f9611009ab43ae8717841"
                }
            ],
            "title": "gfs2: fix double destroy_workqueue error",
            "x_generator": {
                "engine": "bippy-1.2.0"
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        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "id": "CVE-2024-49956",
                                "role": "CISA Coordinator",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "version": "2.0.3",
                                "timestamp": "2024-10-22T13:35:44.463461Z"
                            }
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                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2024-10-22T13:38:48.390Z"
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}