pNFS: Fix uninited ptr deref in block/scsi layout
In the Linux kernel, the following vulnerability has been resolved: pNFS: Fix uninited ptr deref in block/scsi layout The error occurs on the third attempt to encode extents. When function ext_tree_prepare_commit() reallocates a larger buffer to retry encoding extents, the "layoutupdate_pages" page array is initialized only after the retry loop. But ext_tree_free_commitdata() is called on every iteration and tries to put pages in the array, thus dereferencing uninitialized pointers. An additional problem is that there is no limit on the maximum possible buffer_size. When there are too many extents, the client may create a layoutcommit that is larger than the maximum possible RPC size accepted by the server. During testing, we observed two typical scenarios. First, one memory page for extents is enough when we work with small files, append data to the end of the file, or preallocate extents before writing. But when we fill a new large file without preallocating, the number of extents can be huge, and counting the number of written extents in ext_tree_encode_commit() does not help much. Since this number increases even more between unlocking and locking of ext_tree, the reallocated buffer may not be large enough again and again.
CVE-2025-38691
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-38691
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "34dc93c2fc04da0d01acf8a1660b4ab276208af7",
"lessThan": "579b85f893d9885162e1cabf99a4a088916e143e",
"versionType": "git"
},
{
"status": "affected",
"version": "34dc93c2fc04da0d01acf8a1660b4ab276208af7",
"lessThan": "2896f101110076ac6bf99d7aaf463d61e26f89dd",
"versionType": "git"
},
{
"status": "affected",
"version": "34dc93c2fc04da0d01acf8a1660b4ab276208af7",
"lessThan": "4f783333cbfa2ee7d4aa8e47f6bd1b3f77534fcf",
"versionType": "git"
},
{
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"lessThan": "9be5c04beca3202d0a5f09fb4b2ecb644caa0bc5",
"versionType": "git"
},
{
"status": "affected",
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"lessThan": "24334f3cf8a294f253071b5bf22d754dbb6d0f2d",
"versionType": "git"
},
{
"status": "affected",
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"lessThan": "f0b2eee3fbba9b7e3746ef698424ef5e4a197776",
"versionType": "git"
},
{
"status": "affected",
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"lessThan": "94ec6d939031a616474376dadbf4a8d0ef8b0bcc",
"versionType": "git"
},
{
"status": "affected",
"version": "34dc93c2fc04da0d01acf8a1660b4ab276208af7",
"lessThan": "37c3443a2685528f972d910a6fb87716b96fef46",
"versionType": "git"
},
{
"status": "affected",
"version": "34dc93c2fc04da0d01acf8a1660b4ab276208af7",
"lessThan": "9768797c219326699778fba9cd3b607b2f1e7950",
"versionType": "git"
}
],
"programFiles": [
"fs/nfs/blocklayout/extent_tree.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.297",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.241",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.190",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.149",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.103",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.43",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.15.11",
"versionType": "semver",
"lessThanOrEqual": "6.15.*"
},
{
"status": "unaffected",
"version": "6.16.2",
"versionType": "semver",
"lessThanOrEqual": "6.16.*"
},
{
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/nfs/blocklayout/extent_tree.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-38691
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #27046 · Revision 1
- Added to Heist Feed
- Publisher date