smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races
In the Linux kernel, the following vulnerability has been resolved: smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races The invalidHandle, swapfile, oplock_break_cancelled, offload, and status_file_deleted fields are stored in the same bitfield byte in struct cifsFileInfo, but are updated in different code paths that may run simultaneously, and are protected by different locks. Since bitfield assignments generate byte-level read-modify-write operations, a modification to one flag can overwrite a concurrent modification to another flag. To avoid these races, convert these flags from a bitfield to separate bool fields.
CVE-2026-98681
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-2026-98681
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": "3bc303c254335dbd7c7012cc1760b12f1d5514d3",
"lessThan": "3b8e7928cf1928555dc05d172dd02fb0e7692ec4",
"versionType": "git"
},
{
"status": "affected",
"version": "3bc303c254335dbd7c7012cc1760b12f1d5514d3",
"lessThan": "3786ee67658a2c80fef2544e7de2cd329e043cf9",
"versionType": "git"
},
{
"status": "affected",
"version": "3bc303c254335dbd7c7012cc1760b12f1d5514d3",
"lessThan": "4165641d06ef44f3a31b77a28048b6c737e885e7",
"versionType": "git"
},
{
"status": "affected",
"version": "3bc303c254335dbd7c7012cc1760b12f1d5514d3",
"lessThan": "d9d23d115610e0342e768f6cb525d91c7b154027",
"versionType": "git"
},
{
"status": "affected",
"version": "3bc303c254335dbd7c7012cc1760b12f1d5514d3",
"lessThan": "19465a9aeb664f1d710d0d22c07c31bfb7c85446",
"versionType": "git"
}
],
"programFiles": [
"fs/smb/client/cifsglob.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.32"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.32",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"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/cifsglob.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98681
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48905 · Revision 1
- Added to Heist Feed
- Publisher date