← CVE Intelligence

CVE-2026-46243

smb: client: reject userspace cifs.spnego descriptions PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 before 7713bd320ed4fc3d08a227cd8e41242219a16981; affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 before 9544559e59438a4b609b2fdfa0763d8360572824; affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 before cf20038657d6d4974349556a34e08fe0490bebbc; affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 before 2035acfb17221729b1b8ac335e941868a04ca079; affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 before a3bbda6502a9398b816fa2e71c9a3f955f58013d; affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 before 91f89c1d83e80417629791fcef6af8140d7d01c8; affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 before 0aece6685fc80a8de492688ca2315fb86ec379c7; affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 before 3da1fdf4efbc490041eb4f836bf596201203f8f2
Linux / Linuxaffected 2.6.24; unaffected 0 before 2.6.24; unaffected 5.10.258 through 5.10.*; unaffected 5.15.209 through 5.15.*; unaffected 6.1.175 through 6.1.*; unaffected 6.6.142 through 6.6.*; unaffected 6.12.92 through 6.12.*; unaffected 6.18.34 through 6.18.*; unaffected 7.0.11 through 7.0.*; unaffected 7.1 through *

CWE

No CWE identifiers supplied.

References

ADP enrichment

CISA-ADP

No English description supplied.

CVE

No English description supplied.

redhat-SADP

A privilege escalation vulnerability was found in the Linux kernel's CIFS client implementation. This could allow a local attacker to impersonate other users, bypass authentication in SMB mount operations, and potentially gain unauthorized access to network file shares or escalate privileges.

siemens-SADP

No English description supplied.