CVE-2024-49956

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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 \u2014 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 \u2014 a use-after-free read primitive leading to kernel memory disclosure.\nI:H - The use-after-free yields write primitives into the reclaimed object \u2014 `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 \u2014 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"}]}]}], "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"}}, "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"}}}], "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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{"bugzilla": {"description": "kernel: gfs2: fix double destroy_workqueue error", "id": "2320463", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320463"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ngfs2: fix double destroy_workqueue error\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.\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."], "name": "CVE-2024-49956", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-49956\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-49956\nhttps://lore.kernel.org/linux-cve-announce/2024102130-CVE-2024-49956-5278@gregkh/T"], "threat_severity": "Moderate"}

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