{"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"}]}]}],"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"}}]}}