CVE-2026-46243

Summary

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7Patch
• https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079Patch
• https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2Patch
• https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981Patch
• https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8Patch
• https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824Patch
• https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013dPatch
• https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbcPatch