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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 7713bd320ed4fc3d08a227cd8e41242219a16981affected
LinuxLinuxf1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 9544559e59438a4b609b2fdfa0763d8360572824affected
LinuxLinuxf1d662a7d5e5322e583aad6b3cfec03d8f27b435 < cf20038657d6d4974349556a34e08fe0490bebbcaffected
LinuxLinuxf1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 2035acfb17221729b1b8ac335e941868a04ca079affected
LinuxLinuxf1d662a7d5e5322e583aad6b3cfec03d8f27b435 < a3bbda6502a9398b816fa2e71c9a3f955f58013daffected
LinuxLinuxf1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 91f89c1d83e80417629791fcef6af8140d7d01c8affected
LinuxLinuxf1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 0aece6685fc80a8de492688ca2315fb86ec379c7affected
LinuxLinuxf1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 3da1fdf4efbc490041eb4f836bf596201203f8f2affected
LinuxLinux2.6.24affected
LinuxLinux0 < 2.6.24unaffected
LinuxLinux5.10.258 <= 5.10.*unaffected
LinuxLinux5.15.209 <= 5.15.*unaffected
LinuxLinux6.1.175 <= 6.1.*unaffected
LinuxLinux6.6.142 <= 6.6.*unaffected
LinuxLinux6.12.92 <= 6.12.*unaffected
LinuxLinux6.18.34 <= 6.18.*unaffected
LinuxLinux7.0.11 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: no
    • Technical Impact: total

Additional References

CVE Program Container

Additional References

kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions

Additional References

References