smb: client: flush dirty data before zeroing a range
In the Linux kernel, the following vulnerability has been resolved: smb: client: flush dirty data before zeroing a range smb3_zero_range() emulates FALLOC_FL_ZERO_RANGE by invalidating the page cache over the target range with truncate_pagecache_range() and then issuing FSCTL_SET_ZERO_DATA to the server. Dirty data was only flushed conditionally, when the range reached or extended EOF. For a purely interior zero range that does not reach EOF, no flush happened, so a dirty folio overlapping the range could be written back to the server after the FSCTL and refill the range that was just zeroed with stale data. Fix this by unconditionally flushing and waiting for dirty data in the range before invalidating the page cache and issuing FSCTL_SET_ZERO_DATA, exactly as was done for smb3_punch_hole() in commit d7d2adcd022b ("smb/client: flush dirty data before punching a hole"); the two paths are structurally identical here. This is observed as generic/363 randomly reading stale data where a zeroed range is expected against Windows Server.
CVE-2026-98683
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-2026-98683
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": "91d1dfae464987aaf6c79ff51d8674880fb3be77",
"lessThan": "cecf4114069fc19629d284710fd783d56bbca862",
"versionType": "git"
},
{
"status": "affected",
"version": "91d1dfae464987aaf6c79ff51d8674880fb3be77",
"lessThan": "e8ba21c7e6ef3d4cb617858760673877b2e4a2bb",
"versionType": "git"
},
{
"status": "affected",
"version": "91d1dfae464987aaf6c79ff51d8674880fb3be77",
"lessThan": "8f8d32c1044f70e46e87550e039a15ff20a4b21c",
"versionType": "git"
},
{
"status": "affected",
"version": "13af7446428771e9e529284d390e7994df8be683",
"versionType": "git"
},
{
"status": "affected",
"version": "0a9423f99ded38b32bd1864347332cc557e6b141",
"versionType": "git"
},
{
"status": "affected",
"version": "7dfa4279c55f467a88e653a5d544817181b22aea",
"versionType": "git"
},
{
"status": "affected",
"version": "6.1.110",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.51",
"lessThan": "6.7",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.10.10",
"lessThan": "6.11",
"versionType": "semver"
}
],
"programFiles": [
"fs/smb/client/smb2ops.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/client/smb2ops.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98683
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38685 · Revision 1
- Added to Heist Feed
- Publisher date