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Review reviewHigh

CVE-2026-46243

Linux Linux, NVIDIA for RHEL 10, Red Hat Enterprise Linux 10

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.

CVSS
7.1
EPSS
0.38%
30.4% percentile
CISA KEV
Not listed
Published
2026.06.02
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.38%
Technical severityCVSS 7.1

Vulnerability overview

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 product and versions

Product
Linux Linux, NVIDIA for RHEL 10, Red Hat Enterprise Linux 10
Affected versions
>= f1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 7713bd320ed4fc3d08a227cd8e41242219a16981, >= f1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 9544559e59438a4b609b2fdfa0763d8360572824, >= f1d662a7d5e5322e583aad6b3cfec03d8f27b435 < cf20038657d6d4974349556a34e08fe0490bebbc, >= f1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 2035acfb17221729b1b8ac335e941868a04ca079, >= f1d662a7d5e5322e583aad6b3cfec03d8f27b435 < a3bbda6502a9398b816fa2e71c9a3f955f58013d, >= f1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 91f89c1d83e80417629791fcef6af8140d7d01c8, >= f1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 0aece6685fc80a8de492688ca2315fb86ec379c7, >= f1d662a7d5e5322e583aad6b3cfec03d8f27b435 < 3da1fdf4efbc490041eb4f836bf596201203f8f2, >= 2.6.24, >= 2.6.24.1 < 5.10.258, >= 5.11 < 5.15.209, >= 5.16 < 6.1.175, >= 6.2 < 6.6.142, >= 6.7 < 6.12.92, >= 6.13 < 6.18.34, >= 6.19 < 7.0.11, 2.6.24, 7.1
Fixed versions
5.10.258, 5.15.209, 6.1.175, 6.6.142, 6.12.92, 6.18.34, 7.0.11

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, NVIDIA for RHEL 10, Red Hat Enterprise Linux 10 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE
CWE-20, CWE-825