CVE-2026-46243

Advisory lineage Upstream: 0 Downstream: 114
Analyzed
Published: 01 Jun 2026, 16:22
Last modified:20 Jul 2026, 12:05

Vulnerability Summary

Overall Risk (default)
medium
38/100
CVSS Score
7.1 HIGH
v3.1 (cve.org)
EPSS Score
0.35% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

01 Jun 2026, 16:22
Published
Vulnerability first disclosed
20 Jul 2026, 12:05
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS Trends

Current EPSS score: 0.35%• Percentile: 27%

Techniques & Countermeasures

  • CWE-20•Improper Input Validation

    The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

  • CWE-825•Expired Pointer Dereference

    The product dereferences a pointer that contains a location for memory that was previously valid, but is no longer valid.

Affected Systems

  • linux•linux

    ≥ f1d662a7d5e5322e583aad6b3cfec03d8f27b435, < 7713bd320ed4fc3d08a227cd8e41242219a16981 | ≥ f1d662a7d5e5322e583aad6b3cfec03d8f27b435, < 9544559e59438a4b609b2fdfa0763d8360572824 | ≥ f1d662a7d5e5322e583aad6b3cfec03d8f27b435, < cf20038657d6d4974349556a34e08fe0490bebbc | ≥ f1d662a7d5e5322e583aad6b3cfec03d8f27b435, < 2035acfb17221729b1b8ac335e941868a04ca079 | ≥ f1d662a7d5e5322e583aad6b3cfec03d8f27b435, < a3bbda6502a9398b816fa2e71c9a3f955f58013d | ≥ f1d662a7d5e5322e583aad6b3cfec03d8f27b435, < 91f89c1d83e80417629791fcef6af8140d7d01c8 | ≥ f1d662a7d5e5322e583aad6b3cfec03d8f27b435, < 0aece6685fc80a8de492688ca2315fb86ec379c7 | ≥ f1d662a7d5e5322e583aad6b3cfec03d8f27b435, < 3da1fdf4efbc490041eb4f836bf596201203f8f2 | 2.6.24

  • linux•linux kernel

    ≥ 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 | 2.6.24:rc3 | 2.6.24:rc4 | 2.6.24:rc5 | 2.6.24:rc6 | 2.6.24:rc7 | 2.6.24:rc8 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3 | 7.1:rc4

References (45)