PT-2026-45478 · Linux · Linux

Heyitsas · Published 2026-06-01 · Updated 2026-06-01 · CVE-2026-46243

NVD

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Exploit

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2026-46243

Affected Products

Linux

References · 11

• 🔥 https://github.com/manizada/CIFSwitch · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-46243 · Security Note
• https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7 · Note
• https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2 · Note
• https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079 · Note
• https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824 · Note
• https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d · Note
• https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc · Note
• https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981 · Note
• https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8 · Note
• http://openwall.com/lists/oss-security/2026/06/01/6 · Note