CVE-2026-46243
Status: ModifiedHigh (7.1)—
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.
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Base score: 7.1
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 0.20%
- Percentile among all scored CVEs: 9
- Score date: 10/5/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
🎯 ATT&CK techniques
How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.
- Exploitation
T1068Exploitation for Privilege Escalationprivilege escalation85 % - Primary impact
T1078.002Domain Accountsstealth · persistence · privilege escalation · initial access75 % - Secondary impact
T1548Abuse Elevation Control Mechanismprivilege escalation70 %
Acceso local (AV:L) con usuario sin privilegos (PR:L) permite falsificar descripciones de claves SPNEGO, escalando a credenciales administrativas o contextos privilegiados sin interacción.
Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.
🛡️ ATT&CK mitigations that cover these techniques
Affected technologies (1)
CWEs
- NVD-CWE-noinfo
- CWE-20
- CWE-825
References
- https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7
- https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079
- https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2
- https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981
- https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8
- https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824
- https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d
- https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc
- http://www.openwall.com/lists/oss-security/2026/06/01/6
- https://access.redhat.com/errata/RHSA-2026:23258
- https://access.redhat.com/errata/RHSA-2026:23259
- https://access.redhat.com/errata/RHSA-2026:23329
- https://access.redhat.com/errata/RHSA-2026:23395
- https://access.redhat.com/errata/RHSA-2026:24381
- https://access.redhat.com/errata/RHSA-2026:25908
- https://access.redhat.com/errata/RHSA-2026:26462
- https://access.redhat.com/errata/RHSA-2026:26515
- https://access.redhat.com/errata/RHSA-2026:26535
- https://access.redhat.com/errata/RHSA-2026:26563
- https://access.redhat.com/errata/RHSA-2026:26570
- https://access.redhat.com/errata/RHSA-2026:27708
- https://access.redhat.com/errata/RHSA-2026:27719
- https://access.redhat.com/errata/RHSA-2026:27729
- https://access.redhat.com/errata/RHSA-2026:27735
- https://access.redhat.com/errata/RHSA-2026:28887
- https://access.redhat.com/errata/RHSA-2026:28962
- https://access.redhat.com/errata/RHSA-2026:33219
- https://access.redhat.com/errata/RHSA-2026:33220
- https://access.redhat.com/errata/RHSA-2026:33221
- https://access.redhat.com/errata/RHSA-2026:33222
- https://access.redhat.com/errata/RHSA-2026:33223
- https://access.redhat.com/errata/RHSA-2026:33224
- https://access.redhat.com/errata/RHSA-2026:33225
- https://access.redhat.com/errata/RHSA-2026:33486
- https://access.redhat.com/errata/RHSA-2026:34048
- https://access.redhat.com/errata/RHSA-2026:34757
- https://access.redhat.com/errata/RHSA-2026:34764
- https://access.redhat.com/errata/RHSA-2026:34788
- https://access.redhat.com/errata/RHSA-2026:34815
- https://access.redhat.com/errata/RHSA-2026:36620
- https://access.redhat.com/errata/RHSA-2026:40021
- https://access.redhat.com/errata/RHSA-2026:41236
- https://access.redhat.com/errata/RHSA-2026:47727
- https://access.redhat.com/security/cve/CVE-2026-46243
- https://bugzilla.redhat.com/show_bug.cgi?id=2481486
- https://github.com/manizada/CIFSwitch
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46243.json
Raw JSON (NVD)
Show
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