smb: client: Fix use-after-free in cifs_try_adding_channels()
In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix use-after-free in cifs_try_adding_channels() cifs_try_adding_channels() takes a temporary reference to an interface before dropping iface_lock. If cifs_ses_add_channel() fails, it drops that reference and then increments iface->weight_fulfilled. A concurrent interface list refresh can remove the list reference while channel creation is in progress. In that case, the failure-path kref_put() releases the last reference and frees iface. Updating weight_fulfilled afterward then accesses freed memory. Increment weight_fulfilled before dropping the temporary reference, keeping iface alive for the final access.
CVE-2026-74608
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-2026-74608
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": "cbc53148cc0946b72d62a3c53870cb22ce4ec284",
"lessThan": "64d7584e62ac8cdc750455c5fdc6008fc2de4f06",
"versionType": "git"
},
{
"status": "affected",
"version": "cff97d683a083b862a8bb24309e0f4d2d928128a",
"lessThan": "c292d4686f717c03e5022fc4ae7c782f39a94915",
"versionType": "git"
},
{
"status": "affected",
"version": "6aac002bcfd554aff6d3ebb55e1660d078d70ab0",
"lessThan": "47dfac48bce7198ad4f1a388fc8c9491f878ac3b",
"versionType": "git"
},
{
"status": "affected",
"version": "6aac002bcfd554aff6d3ebb55e1660d078d70ab0",
"lessThan": "1ffacbadc14530e55b8d86f7b917524f6a0fb891",
"versionType": "git"
},
{
"status": "affected",
"version": "6aac002bcfd554aff6d3ebb55e1660d078d70ab0",
"lessThan": "1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805",
"versionType": "git"
},
{
"status": "affected",
"version": "6aac002bcfd554aff6d3ebb55e1660d078d70ab0",
"lessThan": "4986410316b1ae0e63c6ce418e4eb196723626e7",
"versionType": "git"
},
{
"status": "affected",
"version": "22a6c5b3425f327e7f4c3606a72277dce82c7d83",
"versionType": "git"
},
{
"status": "affected",
"version": "6.1.78",
"lessThan": "6.1.183",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.17",
"lessThan": "6.6.152",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.7.5",
"lessThan": "6.8",
"versionType": "semver"
}
],
"programFiles": [
"fs/smb/client/sess.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.8"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.8",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.152",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/client/sess.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74608
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #33238 · Revision 1
- Added to Heist Feed
- Publisher date