smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
In the Linux kernel, the following vulnerability has been resolved: smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked() Commit 96c4af418586 ("cifs: Fix locking usage for tcon fields") refactored cifs code to change cifs_tcp_ses_lock for tc_lock around tc_count changes. There was missing lock around tc_count increment inside smb2_find_smb_sess_tcon_unlocked().
CVE-2026-64136
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-2026-64136
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": "953953abb66e52c224057ab91e404284fefeab62",
"lessThan": "7df1df6f40c0720d30206aa35c0343b962350e0d",
"versionType": "git"
},
{
"status": "affected",
"version": "601dd3b79769b38d30b693c40afdb2a4b7edf9d0",
"lessThan": "13fb413ae22a37c69341918a6d651d19a9b0b9b7",
"versionType": "git"
},
{
"status": "affected",
"version": "3969db6b22e3d90d8c5f22ac1a7fe0350a94c136",
"lessThan": "bf4ebdb19ff9b3cdf992b50715fe61633327416a",
"versionType": "git"
},
{
"status": "affected",
"version": "96c4af418586ee9a6aab61738644366426e05316",
"lessThan": "e374f4e496fef8168784f93a4477d67be34485fd",
"versionType": "git"
},
{
"status": "affected",
"version": "96c4af418586ee9a6aab61738644366426e05316",
"lessThan": "4d8690dace005a38e6dbde9ecce2da3ad85c7c41",
"versionType": "git"
},
{
"status": "affected",
"version": "8c59eeeeffa1524ef57e173a89a1a3ff539888d5",
"versionType": "git"
},
{
"status": "affected",
"version": "6.6.128",
"lessThan": "6.6.142",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.75",
"lessThan": "6.12.92",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.18.16",
"lessThan": "6.18.34",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.19.6",
"lessThan": "6.20",
"versionType": "semver"
}
],
"programFiles": [
"fs/smb/client/smb2transport.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "7.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.142",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.92",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.34",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.11",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/client/smb2transport.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64136
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #40965 · Revision 1
- Added to Heist Feed
- Publisher date