smb: client: reject userspace cifs.spnego descriptions
In the Linux kernel, the following vulnerability has been resolved: smb: client: reject userspace cifs.spnego descriptions cifs.spnego key descriptions contain authority-bearing fields such as pid, uid, creduid, and upcall_target that cifs.upcall treats as kernel-originating inputs. However, userspace can also create keys of this type through request_key(2) or add_key(2), allowing those fields to be supplied without CIFS origin. Only accept cifs.spnego descriptions while CIFS is using its private spnego_cred to request the key.
CVE-2026-46243
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-2026-46243
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": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
"lessThan": "7713bd320ed4fc3d08a227cd8e41242219a16981",
"versionType": "git"
},
{
"status": "affected",
"version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
"lessThan": "9544559e59438a4b609b2fdfa0763d8360572824",
"versionType": "git"
},
{
"status": "affected",
"version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
"lessThan": "cf20038657d6d4974349556a34e08fe0490bebbc",
"versionType": "git"
},
{
"status": "affected",
"version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
"lessThan": "2035acfb17221729b1b8ac335e941868a04ca079",
"versionType": "git"
},
{
"status": "affected",
"version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
"lessThan": "a3bbda6502a9398b816fa2e71c9a3f955f58013d",
"versionType": "git"
},
{
"status": "affected",
"version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
"lessThan": "91f89c1d83e80417629791fcef6af8140d7d01c8",
"versionType": "git"
},
{
"status": "affected",
"version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
"lessThan": "0aece6685fc80a8de492688ca2315fb86ec379c7",
"versionType": "git"
},
{
"status": "affected",
"version": "f1d662a7d5e5322e583aad6b3cfec03d8f27b435",
"lessThan": "3da1fdf4efbc490041eb4f836bf596201203f8f2",
"versionType": "git"
}
],
"programFiles": [
"fs/smb/client/cifs_spnego.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.24"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.24",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"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/cifs_spnego.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-46243
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #28413 · Revision 1
- Added to Heist Feed
- Publisher date