smb: client: reject userspace cifs.spnego descriptions

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Summary

CVECVE-2026-46243
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-01 17:17:34 UTC
Updated2026-06-01 21:16:46 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from ADP

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-20 | CWE-20 CWE-20 Improper Input Validation

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 7713bd320ed4fc3d08a227cd8e41242219a16981 git Not specified
CNA Linux Linux affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 9544559e59438a4b609b2fdfa0763d8360572824 git Not specified
CNA Linux Linux affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 cf20038657d6d4974349556a34e08fe0490bebbc git Not specified
CNA Linux Linux affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 2035acfb17221729b1b8ac335e941868a04ca079 git Not specified
CNA Linux Linux affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 a3bbda6502a9398b816fa2e71c9a3f955f58013d git Not specified
CNA Linux Linux affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 91f89c1d83e80417629791fcef6af8140d7d01c8 git Not specified
CNA Linux Linux affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 0aece6685fc80a8de492688ca2315fb86ec379c7 git Not specified
CNA Linux Linux affected f1d662a7d5e5322e583aad6b3cfec03d8f27b435 3da1fdf4efbc490041eb4f836bf596201203f8f2 git Not specified
CNA Linux Linux affected 2.6.24 Not specified
CNA Linux Linux unaffected 2.6.24 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.142 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
github.com/manizada/CIFSwitch 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7713bd320ed4fc3d08a227cd8e41242219a16981 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
www.openwall.com/lists/oss-security/2026/06/01/6 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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