cifs: use cifs_invalidate_cache() in cifs_do_truncate() for O_TRUNC
In the Linux kernel, the following vulnerability has been resolved: cifs: use cifs_invalidate_cache() in cifs_do_truncate() for O_TRUNC cifs_do_truncate() is invoked from cifs_open() without i_rwsem, so it cannot use cifs_resize_file_locked() to perform a proper fscache cookie resize. Instead, add cifs_invalidate_cache() after cifs_setsize(). cifs_invalidate_cache() calls fscache_invalidate(), which works without holding i_rwsem: it unconditionally increments inval_counter and sets FSCACHE_COOKIE_NO_DATA_TO_READ, ensuring that stale cached data is not served once the cookie is later activated by fscache_use_cookie(). Truncation to zero leaves no valid cached data, making invalidation the correct semantic here.
CVE-2026-89639
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-2026-89639
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": "efbcecdecefc26fa062c0e8210533ccad7d6bd4a",
"lessThan": "8b9b10fe5b8b492b27b9f4546742ea541a650213",
"versionType": "git"
},
{
"status": "affected",
"version": "fa724e235cfdb0fb0bb427d0f9dfe864ae27403e",
"lessThan": "81fc3868a7f726980ff845c1d0d271051e5f0f45",
"versionType": "git"
},
{
"status": "affected",
"version": "fa724e235cfdb0fb0bb427d0f9dfe864ae27403e",
"lessThan": "364b183230586a62660a7280c1eb20138338eeb5",
"versionType": "git"
},
{
"status": "affected",
"version": "6838bcac954487cc0a3c8a4ee1b3a3a30e244dc9",
"versionType": "git"
},
{
"status": "affected",
"version": "75640976cf474eb41682a13f2dbe9534ac26ca50",
"versionType": "git"
},
{
"status": "affected",
"version": "3513f3931c579ba2a715784c6dedc59e0d9282ee",
"versionType": "git"
},
{
"status": "affected",
"version": "6.18.44",
"lessThan": "6.18.50",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.105",
"lessThan": "6.13",
"versionType": "semver"
},
{
"status": "affected",
"version": "7.1.8",
"lessThan": "7.2",
"versionType": "semver"
}
],
"programFiles": [
"fs/smb/client/file.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "7.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/client/file.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89639
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #35139 · Revision 1
- Added to Heist Feed
- Publisher date