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CVE-2026-46243— smb: client: reject userspace cifs.spnego descriptions

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于拒绝用户空间cifs.spnego描述，可能导致未授权访问。

CVSS 7.1 · High EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1558.003 · Kerberoasting

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f1d662a7d5e5322e583aad6b3cfec03d8f27b435< 7713bd320ed4fc3d08a227cd8e41242219a16981 affected
f1d662a7d5e5322e583aad6b3cfec03d8f27b435< 9544559e59438a4b609b2fdfa0763d8360572824 affected
f1d662a7d5e5322e583aad6b3cfec03d8f27b435< cf20038657d6d4974349556a34e08fe0490bebbc affected
f1d662a7d5e5322e583aad6b3cfec03d8f27b435< 2035acfb17221729b1b8ac335e941868a04ca079 affected
f1d662a7d5e5322e583aad6b3cfec03d8f27b435< a3bbda6502a9398b816fa2e71c9a3f955f58013d affected
f1d662a7d5e5322e583aad6b3cfec03d8f27b435< 91f89c1d83e80417629791fcef6af8140d7d01c8 affected
f1d662a7d5e5322e583aad6b3cfec03d8f27b435< 0aece6685fc80a8de492688ca2315fb86ec379c7 affected
f1d662a7d5e5322e583aad6b3cfec03d8f27b435< 3da1fdf4efbc490041eb4f836bf596201203f8f2 affected
… +10 more rows
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I. Basic Information for CVE-2026-46243

Vulnerability Information
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Vulnerability Title
smb: client: reject userspace cifs.spnego descriptions
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于拒绝用户空间cifs.spnego描述，可能导致未授权访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f1d662a7d5e5322e583aad6b3cfec03d8f27b435 ~ 7713bd320ed4fc3d08a227cd8e41242219a16981 -
Linux Linux 2.6.24 -

II. Public POCs for CVE-2026-46243

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III. Intelligence Information for CVE-2026-46243

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Patches & Fixes for CVE-2026-46243 (7)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46243

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