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

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.

Public exploit

An exploit or proof of concept is public: anyone can try it against an unpatched system. A reference of the record is tagged as an exploit. CISA's SSVC rates its exploitation: a proof of concept is public.

Show the exploits1

References tagged exploit1 reference

Timeline

  1. ID reserved

    By Linux

  2. · 19 days later

    Published

  3. · 5 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-46243, by who scored it
Scored byCVSSScoreVector
LinuxCNA (assigner)3.1High7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CISA-ADPADP (enrichment)3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
redhat-SADPADP (enrichment)3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Modified3.1High7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS (exploitation in 30 days)
0.41% · top 64% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: poc · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.

Affected products

  • Linux · Linux

    • affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 – < 7713bd320ed4fc3d08a227cd8e41242219a16981
    • affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 – < 9544559e59438a4b609b2fdfa0763d8360572824
    • affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 – < cf20038657d6d4974349556a34e08fe0490bebbc
    • affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 – < 2035acfb17221729b1b8ac335e941868a04ca079
    • affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 – < a3bbda6502a9398b816fa2e71c9a3f955f58013d
    • affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 – < 91f89c1d83e80417629791fcef6af8140d7d01c8
    • affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 – < 0aece6685fc80a8de492688ca2315fb86ec379c7
    • affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 – < 3da1fdf4efbc490041eb4f836bf596201203f8f2

  • Linux · Linux

    • affected 2.6.24
    • unaffected < 2.6.24
    • unaffected 5.10.258 – ≤ 5.10.*
    • unaffected 5.15.209 – ≤ 5.15.*
    • unaffected 6.1.175 – ≤ 6.1.*
    • unaffected 6.6.142 – ≤ 6.6.*
    • unaffected 6.12.92 – ≤ 6.12.*
    • unaffected 6.18.34 – ≤ 6.18.*
    • unaffected 7.0.11 – ≤ 7.0.*
    • unaffected 7.1 – ≤ *

References

References48

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .