CVE-2024-49965 (GCVE-0-2024-49965)
Vulnerability from cvelistv5 – Published: 2024-10-21 18:02 – Updated: 2026-08-05 11:40
VLAI
EPSS
VEX
Title
ocfs2: remove unreasonable unlock in ocfs2_read_blocks
Summary
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: remove unreasonable unlock in ocfs2_read_blocks
Patch series "Misc fixes for ocfs2_read_blocks", v5.
This series contains 2 fixes for ocfs2_read_blocks(). The first patch fix
the issue reported by syzbot, which detects bad unlock balance in
ocfs2_read_blocks(). The second patch fixes an issue reported by Heming
Zhao when reviewing above fix.
This patch (of 2):
There was a lock release before exiting, so remove the unreasonable unlock.
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:
6c150df9c2e80b5cf86f5a0d98beb7390ad63bfc , < 5245f109b4afb6595360d4c180d483a6d2009a59
(git)
Affected: cf76c78595ca87548ca5e45c862ac9e0949c4687 , < 9753bcb17b36c9add9b32c61766ddf8d2d161911 (git) Affected: cf76c78595ca87548ca5e45c862ac9e0949c4687 , < 3f1ca6ba5452d53c598a45d21267a2c0c221eef3 (git) Affected: cf76c78595ca87548ca5e45c862ac9e0949c4687 , < f55a33fe0fb5274ef185fd61947cf142138958af (git) Affected: cf76c78595ca87548ca5e45c862ac9e0949c4687 , < 81aba693b129e82e11bb54f569504d943d018de9 (git) Affected: cf76c78595ca87548ca5e45c862ac9e0949c4687 , < 84543da867c967edffd5065fa910ebf56aaae49d (git) Affected: cf76c78595ca87548ca5e45c862ac9e0949c4687 , < df4f20fc3673cee11abf2c571987a95733cb638d (git) Affected: cf76c78595ca87548ca5e45c862ac9e0949c4687 , < 39a88623af3f1c686bf6db1e677ed865ffe6fccc (git) Affected: cf76c78595ca87548ca5e45c862ac9e0949c4687 , < c03a82b4a0c935774afa01fd6d128b444fd930a1 (git) Affected: 01f93d5e36753fc4d06ec67f05ce78c9c6f2dd56 (git) Affected: 65cbd1279f4b999d56a838344a30642db24cd215 (git) Affected: 97e1db17bc1ef4c2e1789bc9323c7be44fba53f8 (git) Affected: 4.19.87 , < 4.19.323 (semver) Affected: 4.4.204 , < 4.5 (semver) Affected: 4.9.204 , < 4.10 (semver) Affected: 4.14.157 , < 4.15 (semver) |
guessed | |
| Linux | Linux |
Affected:
4.20
Unaffected: 0 , < 4.20 (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": "AV:L - The vulnerable path is reached only through local syscalls against a mounted ocfs2 volume (stat/open/readdir/getxattr/read reaching ocfs2_read_inode_block, dx-leaf, xattr-bucket and extent-map reads) or by mounting a crafted ocfs2 image; no network protocol handler processes attacker data here.\nAC:L - sb_getblk() failure is deterministic for an out-of-range block number supplied by on-disk metadata (grow_buffers() rejects it outright), and is also inducible via memory pressure; the follow-on mutual-exclusion failure has a wait_on_buffer()-wide window with the attacker driving both racing threads.\nPR:L - Any unprivileged local user with access to a mounted ocfs2 filesystem can issue the metadata reads that reach ocfs2_read_blocks() and drive the allocation failure; no capability, and ocfs2 metadata reads are not gated behind CAP_SYS_ADMIN.\nUI:N - On an already-mounted ocfs2 volume (the normal cluster deployment) the attacker triggers the double unlock purely with its own syscalls; no victim action is needed.\nS:U - The corrupted mutex, the ocfs2 metadata cache and the buffer heads all live in the same kernel security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - Losing mutual exclusion lets a second thread run ocfs2_expand_cache() against the already-converted union, copying live rb_node kernel heap pointers into c_block values that surface through mlog/tracepoints, and the resulting metadata-cache corruption is leverageable for further kernel memory disclosure.\nI:H - The spurious unlock releases a mutex held by another task, allowing unserialized rb-tree insertion, ci_num_cached/ci_flags corruption and orphaned kmem_cache objects in a region whose invariants are explicitly unchecked, i.e. attacker-influenced corruption of kernel heap state and of the clustered-uptodate metadata the filesystem trusts.\nA:H - The imbalance produces an immediate lockdep/DEBUG_MUTEXES \"bad unlock balance\" splat (panic under panic_on_warn) and, in production builds, reaches BUG() via mlog_bug_on_msg() in ocfs2_expand_cache(), the duplicate-insert BUG() in __ocfs2_insert_cache_tree(), or the ip_io_mutex assertion in ocfs2_clear_inode() \u2014 all kernel panics."
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"datePublished": "2024-10-21T18:02:16.407Z",
"dateReserved": "2024-10-21T12:17:06.050Z",
"dateUpdated": "2026-08-05T11:40:44.001Z",
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"date": "2026-09-14",
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"title": "ocfs2: remove unreasonable unlock in ocfs2_read_blocks",
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"nvd": "{\"cve\":{\"id\":\"CVE-2024-49965\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T18:15:17.593\",\"lastModified\":\"2026-08-04T11:21:02.847\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nocfs2: remove unreasonable unlock in ocfs2_read_blocks\\n\\nPatch series \\\"Misc fixes for ocfs2_read_blocks\\\", v5.\\n\\nThis series contains 2 fixes for ocfs2_read_blocks(). The first patch fix\\nthe issue reported by syzbot, which detects bad unlock balance in\\nocfs2_read_blocks(). The second patch fixes an issue reported by Heming\\nZhao when reviewing above fix.\\n\\n\\nThis patch (of 2):\\n\\nThere was a lock release before exiting, so remove the unreasonable unlock.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ocfs2: eliminar el desbloqueo irrazonable en ocfs2_read_blocks Serie de parches \\\"Correcciones varias para ocfs2_read_blocks\\\", v5. Esta serie contiene 2 correcciones para ocfs2_read_blocks(). El primer parche corrige el problema informado por syzbot, que detecta un balance de desbloqueo incorrecto en ocfs2_read_blocks(). El segundo parche corrige un problema informado por Heming Zhao al revisar la correcci\u00f3n anterior. Este parche (de 2): Hubo una liberaci\u00f3n de bloqueo antes de salir, as\u00ed que elimine el desbloqueo 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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-09-13T15:08:20+00:00",
"cve": "CVE-2024-49965",
"id": "CVE-2024-49965",
"initial_release_date": "2024-10-21T00:00:00+00:00",
"product_status:known_not_affected": "198",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ocfs2: remove unreasonable unlock in ocfs2_read_blocks",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-49965.json",
"version": "3"
},
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The first patch fix\\nthe issue reported by syzbot, which detects bad unlock balance in\\nocfs2_read_blocks(). The second patch fixes an issue reported by Heming\\nZhao when reviewing above fix.\\n\\n\\nThis patch (of 2):\\n\\nThere was a lock release before exiting, so remove the unreasonable unlock.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.323\", \"versionStartIncluding\": \"4.19.87\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.285\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.227\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.168\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.113\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.55\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.14\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.3\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.4.204\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.9.204\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.14.157\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:54:10.835Z\"}}}",
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"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.
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.
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