174 lines
9.1 KiB
JSON
174 lines
9.1 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-49956",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-10-21T12:17:06.048Z",
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"datePublished": "2024-10-21T18:02:10.385Z",
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"dateUpdated": "2026-08-05T11:40:40.767Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:40:40.767Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/gfs2/glock.c",
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"fs/gfs2/ops_fstype.c"
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],
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"versions": [
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{
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"version": "30e388d573673474cbd089dec83688331c117add",
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"lessThan": "a5336035728d77efd76306940d742a6f23debe68",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "30e388d573673474cbd089dec83688331c117add",
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"lessThan": "6cb9df81a2c462b89d2f9611009ab43ae8717841",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/gfs2/glock.c",
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"fs/gfs2/ops_fstype.c"
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],
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"versions": [
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{
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"version": "6.11",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.11",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.11.3",
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"lessThanOrEqual": "6.11.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.11",
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"versionEndExcluding": "6.11.3"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.11",
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"versionEndExcluding": "6.12"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/a5336035728d77efd76306940d742a6f23debe68"
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},
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{
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"url": "https://git.kernel.org/stable/c/6cb9df81a2c462b89d2f9611009ab43ae8717841"
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}
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],
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"title": "gfs2: fix double destroy_workqueue error",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2024-49956",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2024-10-22T13:35:44.463461Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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