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vuln-cve/data/2024/49xxx/CVE-2024-49965.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2024-49965",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-10-21T12:17:06.050Z",
"datePublished": "2024-10-21T18:02:16.407Z",
"dateUpdated": "2026-08-05T11:40:44.001Z"
},
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{
"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."
}
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"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
},
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{
"lang": "en",
"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() — all kernel panics."
}
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}
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}
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