CVE-2026-72159 (GCVE-0-2026-72159)
Vulnerability from cvelistv5
Published
2026-08-15 05:53
Modified
2026-08-17 05:09
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: reject non-inline dinodes with i_size and zero i_clusters
On a volume mounted without OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC, a
non-inline regular file with non-zero i_size and zero i_clusters is
structurally malformed: the extent map declares no allocated clusters yet
the size header claims content exists. Keep rejecting that shape, but
express it through a shared predicate so the same invariant is available
to normal inode reads and online filecheck.
The same zero-cluster shape is also malformed for non-inline directories.
ocfs2 directory growth allocates backing storage before advancing i_size,
and ocfs2_dir_foreach_blk_el() later walks until ctx->pos reaches
i_size_read(inode). A forged directory dinode with a huge i_size and no
clusters would repeatedly fail on holes while advancing through the
claimed size.
Sparse regular files remain exempt: on sparse-alloc volumes, truncate can
legitimately grow i_size without allocating clusters. System inodes and
inline-data dinodes also retain their separate storage rules.
Mirror the check in ocfs2_filecheck_validate_inode_block() as well.
filecheck reports through its own error namespace, so malformed
size/cluster state is logged as a filecheck invalid-inode result rather
than via ocfs2_error(), but it must not proceed into
ocfs2_populate_inode().
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: b657c95c11088d77fc1bfc9c84d940f778bf9d12 Version: b657c95c11088d77fc1bfc9c84d940f778bf9d12 Version: b657c95c11088d77fc1bfc9c84d940f778bf9d12 Version: b657c95c11088d77fc1bfc9c84d940f778bf9d12 Version: b657c95c11088d77fc1bfc9c84d940f778bf9d12 Version: b657c95c11088d77fc1bfc9c84d940f778bf9d12 Version: b657c95c11088d77fc1bfc9c84d940f778bf9d12 Version: b657c95c11088d77fc1bfc9c84d940f778bf9d12 |
||
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: reject non-inline dinodes with i_size and zero i_clusters\n\nOn a volume mounted without OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC, a\nnon-inline regular file with non-zero i_size and zero i_clusters is\nstructurally malformed: the extent map declares no allocated clusters yet\nthe size header claims content exists. Keep rejecting that shape, but\nexpress it through a shared predicate so the same invariant is available\nto normal inode reads and online filecheck.\n\nThe same zero-cluster shape is also malformed for non-inline directories. \nocfs2 directory growth allocates backing storage before advancing i_size,\nand ocfs2_dir_foreach_blk_el() later walks until ctx-\u003epos reaches\ni_size_read(inode). A forged directory dinode with a huge i_size and no\nclusters would repeatedly fail on holes while advancing through the\nclaimed size.\n\nSparse regular files remain exempt: on sparse-alloc volumes, truncate can\nlegitimately grow i_size without allocating clusters. System inodes and\ninline-data dinodes also retain their separate storage rules.\n\nMirror the check in ocfs2_filecheck_validate_inode_block() as well. \nfilecheck reports through its own error namespace, so malformed\nsize/cluster state is logged as a filecheck invalid-inode result rather\nthan via ocfs2_error(), but it must not proceed into\nocfs2_populate_inode()."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:09:19.690Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/416d3e5f8a30ed04fe21ba7dc73c2841c3b56265"
},
{
"url": "https://git.kernel.org/stable/c/ed0f938f946f16b772e99cb8c277ab57828e5be4"
},
{
"url": "https://git.kernel.org/stable/c/83f6756a7b71adec0a41ae68e079a38906d59c6c"
},
{
"url": "https://git.kernel.org/stable/c/38c1ef7ce50eb4af0f89038b8aba12396ddb9233"
},
{
"url": "https://git.kernel.org/stable/c/d837068eefbc2651fe5789bf75a0f945710f7b8e"
},
{
"url": "https://git.kernel.org/stable/c/2174c68f623b74bd8690a4a6a4a52882d8ac3dc3"
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{
"url": "https://git.kernel.org/stable/c/3bfeb436d4be6a2beb56cab344770e93e6b07260"
},
{
"url": "https://git.kernel.org/stable/c/7ebc672fab7a76e1e47e0f2fc1ee48118d27fde4"
}
],
"title": "ocfs2: reject non-inline dinodes with i_size and zero i_clusters",
"x_generator": {
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}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-72159",
"datePublished": "2026-08-15T05:53:28.205Z",
"dateReserved": "2026-08-09T03:40:39.909Z",
"dateUpdated": "2026-08-17T05:09:19.690Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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