CVE-2024-49966 (GCVE-0-2024-49966)
Vulnerability from cvelistv5 – Published: 2024-10-21 18:02 – Updated: 2026-08-05 11:40
VLAI
EPSS
VEX
Title
ocfs2: cancel dqi_sync_work before freeing oinfo
Summary
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: cancel dqi_sync_work before freeing oinfo
ocfs2_global_read_info() will initialize and schedule dqi_sync_work at the
end, if error occurs after successfully reading global quota, it will
trigger the following warning with CONFIG_DEBUG_OBJECTS_* enabled:
ODEBUG: free active (active state 0) object: 00000000d8b0ce28 object type: timer_list hint: qsync_work_fn+0x0/0x16c
This reports that there is an active delayed work when freeing oinfo in
error handling, so cancel dqi_sync_work first. BTW, return status instead
of -1 when .read_file_info fails.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-22 13:34 UTC
Assigner
References
11 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < fc5cc716dfbdc5fd5f373ff3b51358174cf88bfc
(git)
Affected: 171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < 89043e7ed63c7fc141e68ea5a79758ed24b6c699 (git) Affected: 171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < 14114d8148db07e7946fb06b56a50cfa425e26c7 (git) Affected: 171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < 4173d1277c00baeedaaca76783e98b8fd0e3c08d (git) Affected: 171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < bbf41277df8b33fbedf4750a9300c147e8f104eb (git) Affected: 171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < ef768020366f47d23f39c4f57bcb03af6d1e24b3 (git) Affected: 171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < a4346c04d055bf7e184c18a73dbd23b6a9811118 (git) Affected: 171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < 0d707a33c84b371cb66120e198eed3374726ddd8 (git) Affected: 171bf93ce11f4c9929fdce6ce63df8da2f3c4475 , < 35fccce29feb3706f649726d410122dd81b92c18 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.29
Unaffected: 0 , < 2.6.29 (semver) Unaffected: 4.19.323 , ≤ 4.19.* (semver) Unaffected: 5.4.285 , ≤ 5.4.* (semver) Unaffected: 5.10.227 , ≤ 5.10.* (semver) Unaffected: 5.15.168 , ≤ 5.15.* (semver) Unaffected: 6.1.113 , ≤ 6.1.* (semver) Unaffected: 6.6.55 , ≤ 6.6.* (semver) Unaffected: 6.10.14 , ≤ 6.10.* (semver) Unaffected: 6.11.3 , ≤ 6.11.* (semver) Unaffected: 6.12 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: cancel dqi_sync_work before freeing oinfo\n\nocfs2_global_read_info() will initialize and schedule dqi_sync_work at the\nend, if error occurs after successfully reading global quota, it will\ntrigger the following warning with CONFIG_DEBUG_OBJECTS_* enabled:\n\nODEBUG: free active (active state 0) object: 00000000d8b0ce28 object type: timer_list hint: qsync_work_fn+0x0/0x16c\n\nThis reports that there is an active delayed work when freeing oinfo in\nerror handling, so cancel dqi_sync_work first. BTW, return status instead\nof -1 when .read_file_info fails."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerable path is entered only through `ocfs2_enable_quotas()`/`ocfs2_remount()` when an ocfs2 image is mounted locally, so the attacker needs local access to present the crafted block device or image file. There is no remote or adjacent-network data path into `ocfs2_local_read_info()`.\nAC:L - The attacker authors the on-disk image and therefore controls both the failure trigger (unvalidated `dqi_chunks`/quota-block ECC guaranteeing an error after `ocfs2_global_read_info()` succeeds) and `dqi_syncms`, which sets the exact delay before the freed timer fires \u2014 giving a deterministic, repeatable free-then-spray-then-fire window. No condition outside the attacker\u0027s influence is required.\nPR:L - In the realistic worst case a low-privileged local user supplies the crafted image on removable media or via a delegated/`user` fstab mount and a privileged automounter (udisks2/systemd) performs the mount, so the attacker themself holds only unprivileged credentials. Per the uncertainty rule the lower privilege tier is taken over requiring real CAP_SYS_ADMIN.\nUI:N - On desktop, kiosk and shared-workstation deployments the mount is performed automatically by the automount daemon on media insertion \u2014 an action the attacker performs \u2014 so no separate victim interaction is needed.\nS:U - The freed object, the timer wheel and the work handler all live within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a slab use-after-free: the attacker can reallocate the freed `ocfs2_mem_dqinfo` and have `qsync_work_fn()` dereference an attacker-chosen `dqi_gqinode`/`i_sb`, and `dquot_scan_active()` then walks structures at attacker-influenced addresses, yielding an arbitrary-read primitive.\nI:H - `expire_timers()` reads `timer-\u003efunction` from the freed object and calls it while `detach_timer()` writes back into it, so a successful heap spray gives a controlled indirect call and write primitive \u2014 full control-flow hijack, not merely state corruption.\nA:H - Even unexploited the dangling timer causes a wild function-pointer call or NULL/garbage dereference in softirq context, producing a kernel oops or panic; with debug objects enabled it trips the ODEBUG \"free active object\" report."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:40:45.084Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/fc5cc716dfbdc5fd5f373ff3b51358174cf88bfc"
},
{
"url": "https://git.kernel.org/stable/c/89043e7ed63c7fc141e68ea5a79758ed24b6c699"
},
{
"url": "https://git.kernel.org/stable/c/14114d8148db07e7946fb06b56a50cfa425e26c7"
},
{
"url": "https://git.kernel.org/stable/c/4173d1277c00baeedaaca76783e98b8fd0e3c08d"
},
{
"url": "https://git.kernel.org/stable/c/bbf41277df8b33fbedf4750a9300c147e8f104eb"
},
{
"url": "https://git.kernel.org/stable/c/ef768020366f47d23f39c4f57bcb03af6d1e24b3"
},
{
"url": "https://git.kernel.org/stable/c/a4346c04d055bf7e184c18a73dbd23b6a9811118"
},
{
"url": "https://git.kernel.org/stable/c/0d707a33c84b371cb66120e198eed3374726ddd8"
},
{
"url": "https://git.kernel.org/stable/c/35fccce29feb3706f649726d410122dd81b92c18"
}
],
"title": "ocfs2: cancel dqi_sync_work before freeing oinfo",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-49966",
"datePublished": "2024-10-21T18:02:17.076Z",
"dateReserved": "2024-10-21T12:17:06.050Z",
"dateUpdated": "2026-08-05T11:40:45.084Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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