CVE-2026-98125 (GCVE-0-2026-98125)
Vulnerability from cvelistv5
Published
2026-09-25 10:36
Modified
2026-10-21 12:54
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
smb/client: fix stale page cache in insert/collapse range
smb3_insert_range() and smb3_collapse_range() use
truncate_pagecache_range() to invalidate the affected page cache.
However, if off or old_eof is not page-aligned, the boundary pages are
only partially zeroed and remain uptodate. As a result, the client may
return stale data after a successful insert/collapse range operation.
For example, with 4K pages:
page 0 page 1 page 2
0------4K 4K------8K 8K------12K
^ ^
off=2K old_eof=10K
Page 1 is removed from the page cache, while the boundary pages are
only partially zeroed. After COPYCHUNK moves the data on the server,
these cached pages may still return stale data.
This can be reproduced on a CIFS mount:
bash -c '
FILE=/mnt/scratch/repro
# Use a 6 KiB file so EOF is not page-aligned.
dd if=/dev/urandom of=/tmp/src bs=1K count=6 status=none
# Expected: a 4 KiB hole followed by the original data.
rm -f /tmp/expected
truncate -s 4K /tmp/expected
cat /tmp/src >> /tmp/expected
cp /tmp/src "$FILE"
# Prime the page cache before moving data on the server.
cat "$FILE" > /dev/null
fallocate --insert-range -o 0 -l 4K "$FILE"
if cmp -s /tmp/expected "$FILE"; then
echo "readback: OK"
else
echo "readback: STALE DATA"
fi
'
Fix this by writing back dirty data and discarding the page cache from
the start of the page containing off to EOF before moving data on the
server.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: fa30a81f255a56cccd89552cd6ce7ea6e8d8acc4 Version: fa30a81f255a56cccd89552cd6ce7ea6e8d8acc4 Version: fa30a81f255a56cccd89552cd6ce7ea6e8d8acc4 Version: 49523a4732204bdacbf3941a016503ddb4ddb3b9 Version: 0cdde8460c304283d4ebe3f767a70215d1ab9d4e Version: 5.19.12 ≤ |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/smb/client/smb2ops.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "52dd721b3de57e41261e08485b2bc62b22b80ebe",
"status": "affected",
"version": "fa30a81f255a56cccd89552cd6ce7ea6e8d8acc4",
"versionType": "git"
},
{
"lessThan": "76222e76d08fbae4092ee9da84ded2b4c24ee598",
"status": "affected",
"version": "fa30a81f255a56cccd89552cd6ce7ea6e8d8acc4",
"versionType": "git"
},
{
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"status": "affected",
"version": "fa30a81f255a56cccd89552cd6ce7ea6e8d8acc4",
"versionType": "git"
},
{
"status": "affected",
"version": "49523a4732204bdacbf3941a016503ddb4ddb3b9",
"versionType": "git"
},
{
"status": "affected",
"version": "0cdde8460c304283d4ebe3f767a70215d1ab9d4e",
"versionType": "git"
},
{
"lessThan": "5.20",
"status": "affected",
"version": "5.19.12",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/smb/client/smb2ops.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.0"
},
{
"lessThan": "6.0",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.160",
"versionStartIncluding": "6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.7",
"versionStartIncluding": "6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3",
"versionStartIncluding": "6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.19.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.19.12",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: fix stale page cache in insert/collapse range\n\nsmb3_insert_range() and smb3_collapse_range() use\ntruncate_pagecache_range() to invalidate the affected page cache.\nHowever, if off or old_eof is not page-aligned, the boundary pages are\nonly partially zeroed and remain uptodate. As a result, the client may\nreturn stale data after a successful insert/collapse range operation.\n\nFor example, with 4K pages:\n\n page 0 page 1 page 2\n 0------4K 4K------8K 8K------12K\n ^ ^\n off=2K old_eof=10K\n\nPage 1 is removed from the page cache, while the boundary pages are\nonly partially zeroed. After COPYCHUNK moves the data on the server,\nthese cached pages may still return stale data.\n\nThis can be reproduced on a CIFS mount:\n\n bash -c \u0027\n FILE=/mnt/scratch/repro\n\n # Use a 6 KiB file so EOF is not page-aligned.\n dd if=/dev/urandom of=/tmp/src bs=1K count=6 status=none\n\n # Expected: a 4 KiB hole followed by the original data.\n rm -f /tmp/expected\n truncate -s 4K /tmp/expected\n cat /tmp/src \u003e\u003e /tmp/expected\n\n cp /tmp/src \"$FILE\"\n\n # Prime the page cache before moving data on the server.\n cat \"$FILE\" \u003e /dev/null\n\n fallocate --insert-range -o 0 -l 4K \"$FILE\"\n\n if cmp -s /tmp/expected \"$FILE\"; then\n echo \"readback: OK\"\n else\n echo \"readback: STALE DATA\"\n fi\n \u0027\n\nFix this by writing back dirty data and discarding the page cache from\nthe start of the page containing off to EOF before moving data on the\nserver."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-21T12:54:36.373Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/52dd721b3de57e41261e08485b2bc62b22b80ebe"
},
{
"url": "https://git.kernel.org/stable/c/76222e76d08fbae4092ee9da84ded2b4c24ee598"
},
{
"url": "https://git.kernel.org/stable/c/01261a6fa48b62f5ead8e88aaca1e27cb9ab9032"
}
],
"title": "smb/client: fix stale page cache in insert/collapse range",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-98125",
"datePublished": "2026-09-25T10:36:07.163Z",
"dateReserved": "2026-09-25T10:25:14.318Z",
"dateUpdated": "2026-10-21T12:54:36.373Z",
"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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