CVE-2026-43075 (GCVE-0-2026-43075)
Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-08 12:40
VLAI?
Title
ocfs2: fix out-of-bounds write in ocfs2_write_end_inline
Summary
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: fix out-of-bounds write in ocfs2_write_end_inline
KASAN reports a use-after-free write of 4086 bytes in
ocfs2_write_end_inline, called from ocfs2_write_end_nolock during a
copy_file_range splice fallback on a corrupted ocfs2 filesystem mounted on
a loop device. The actual bug is an out-of-bounds write past the inode
block buffer, not a true use-after-free. The write overflows into an
adjacent freed page, which KASAN reports as UAF.
The root cause is that ocfs2_try_to_write_inline_data trusts the on-disk
id_count field to determine whether a write fits in inline data. On a
corrupted filesystem, id_count can exceed the physical maximum inline data
capacity, causing writes to overflow the inode block buffer.
Call trace (crash path):
vfs_copy_file_range (fs/read_write.c:1634)
do_splice_direct
splice_direct_to_actor
iter_file_splice_write
ocfs2_file_write_iter
generic_perform_write
ocfs2_write_end
ocfs2_write_end_nolock (fs/ocfs2/aops.c:1949)
ocfs2_write_end_inline (fs/ocfs2/aops.c:1915)
memcpy_from_folio <-- KASAN: write OOB
So add id_count upper bound check in ocfs2_validate_inode_block() to
alongside the existing i_size check to fix it.
Severity ?
7.8 (High)
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Affected:
1afc32b952335f665327a1a9001ba1b44bb76fd9 , < e2c9dc6b6e96f3585f2a1062ca3374a52db0938f
(git)
Affected: 1afc32b952335f665327a1a9001ba1b44bb76fd9 , < 947f953978b0d9463498d548d0f054f5a75be2e9 (git) Affected: 1afc32b952335f665327a1a9001ba1b44bb76fd9 , < 0c1af902223b6fcedb60904ca0b551254686c7b9 (git) Affected: 1afc32b952335f665327a1a9001ba1b44bb76fd9 , < 69d3c69ade1e4285ab4ca48fe7acee0767e65604 (git) Affected: 1afc32b952335f665327a1a9001ba1b44bb76fd9 , < 7bc5da4842bed3252d26e742213741a4d0ac1b14 (git) |
||
{
"containers": {
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"version": "2.6.24"
},
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"status": "unaffected",
"version": "0",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.6.136",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.12.83",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.18.24",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.19.14",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix out-of-bounds write in ocfs2_write_end_inline\n\nKASAN reports a use-after-free write of 4086 bytes in\nocfs2_write_end_inline, called from ocfs2_write_end_nolock during a\ncopy_file_range splice fallback on a corrupted ocfs2 filesystem mounted on\na loop device. The actual bug is an out-of-bounds write past the inode\nblock buffer, not a true use-after-free. The write overflows into an\nadjacent freed page, which KASAN reports as UAF.\n\nThe root cause is that ocfs2_try_to_write_inline_data trusts the on-disk\nid_count field to determine whether a write fits in inline data. On a\ncorrupted filesystem, id_count can exceed the physical maximum inline data\ncapacity, causing writes to overflow the inode block buffer.\n\nCall trace (crash path):\n\n vfs_copy_file_range (fs/read_write.c:1634)\n do_splice_direct\n splice_direct_to_actor\n iter_file_splice_write\n ocfs2_file_write_iter\n generic_perform_write\n ocfs2_write_end\n ocfs2_write_end_nolock (fs/ocfs2/aops.c:1949)\n ocfs2_write_end_inline (fs/ocfs2/aops.c:1915)\n memcpy_from_folio \u003c-- KASAN: write OOB\n\nSo add id_count upper bound check in ocfs2_validate_inode_block() to\nalongside the existing i_size check to fix it."
}
],
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"url": "https://git.kernel.org/stable/c/e2c9dc6b6e96f3585f2a1062ca3374a52db0938f"
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"url": "https://git.kernel.org/stable/c/947f953978b0d9463498d548d0f054f5a75be2e9"
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"url": "https://git.kernel.org/stable/c/0c1af902223b6fcedb60904ca0b551254686c7b9"
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"url": "https://git.kernel.org/stable/c/69d3c69ade1e4285ab4ca48fe7acee0767e65604"
},
{
"url": "https://git.kernel.org/stable/c/7bc5da4842bed3252d26e742213741a4d0ac1b14"
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],
"title": "ocfs2: fix out-of-bounds write in ocfs2_write_end_inline",
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"cveId": "CVE-2026-43075",
"datePublished": "2026-05-06T07:40:03.337Z",
"dateReserved": "2026-05-01T14:12:55.982Z",
"dateUpdated": "2026-05-08T12:40:23.336Z",
"state": "PUBLISHED"
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"date": "2026-05-08",
"epss": "0.00018",
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"nvd": "{\"cve\":{\"id\":\"CVE-2026-43075\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-06T10:16:20.463\",\"lastModified\":\"2026-05-08T13:16:38.160\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nocfs2: fix out-of-bounds write in ocfs2_write_end_inline\\n\\nKASAN reports a use-after-free write of 4086 bytes in\\nocfs2_write_end_inline, called from ocfs2_write_end_nolock during a\\ncopy_file_range splice fallback on a corrupted ocfs2 filesystem mounted on\\na loop device. The actual bug is an out-of-bounds write past the inode\\nblock buffer, not a true use-after-free. The write overflows into an\\nadjacent freed page, which KASAN reports as UAF.\\n\\nThe root cause is that ocfs2_try_to_write_inline_data trusts the on-disk\\nid_count field to determine whether a write fits in inline data. On a\\ncorrupted filesystem, id_count can exceed the physical maximum inline data\\ncapacity, causing writes to overflow the inode block buffer.\\n\\nCall trace (crash path):\\n\\n vfs_copy_file_range (fs/read_write.c:1634)\\n do_splice_direct\\n splice_direct_to_actor\\n iter_file_splice_write\\n ocfs2_file_write_iter\\n generic_perform_write\\n ocfs2_write_end\\n ocfs2_write_end_nolock (fs/ocfs2/aops.c:1949)\\n ocfs2_write_end_inline (fs/ocfs2/aops.c:1915)\\n memcpy_from_folio \u003c-- KASAN: write OOB\\n\\nSo add id_count upper bound check in ocfs2_validate_inode_block() to\\nalongside the existing i_size check to fix it.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0c1af902223b6fcedb60904ca0b551254686c7b9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/69d3c69ade1e4285ab4ca48fe7acee0767e65604\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7bc5da4842bed3252d26e742213741a4d0ac1b14\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/947f953978b0d9463498d548d0f054f5a75be2e9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e2c9dc6b6e96f3585f2a1062ca3374a52db0938f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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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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