7.1
High
CVE-2026-46243 In the Linux kernel, the following vulnerability has been resolved: smb: client: reject userspace cifs.spnego…
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 products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux 7.1 | earliest → < 7.1 | 7.1 |
| Linux 7.0 | earliest → < 7.0.11 | 7.0.11 |
| Linux 6.18 | earliest → < 6.18.34 | 6.18.34 |
| Linux 6.12 | earliest → < 6.12.92 | 6.12.92 |
| Linux 6.6 | earliest → < 6.6.142 | 6.6.142 |
| Linux 6.1 | earliest → < 6.1.175 | 6.1.175 |
| Linux 5.15 | earliest → < 5.15.209 | 5.15.209 |
| Linux 5.10 | earliest → < 5.10.258 | 5.10.258 |
| Linux | 2.6.24 | No fix stated |
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