CVE-2026-46243
smb: client: reject userspace cifs.spnego descriptions
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Description
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
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981
- https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824
- https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc
- https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079
- https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d
References (48)
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