CVE & CISA-KEV Catalog

CVE-2026-46243

HIGH
7.8
CVSS v3
NVD

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.

CWE-20Improper Input ValidationCWE-825

How to fix

Remediation Available
bpftoolAmazon
Fixed in:1:6.1.172-216.339.amzn2023
Fixed in:1:6.1.172-216.339.amzn2023
bpftool-debuginfoAmazon
Fixed in:1:6.1.172-216.339.amzn2023
Fixed in:1:6.1.172-216.339.amzn2023
bpftool6.12Amazon
Fixed in:1:6.12.88-119.160.amzn2023
Fixed in:1:6.12.88-119.160.amzn2023
bpftool6.12-debuginfoAmazon
Fixed in:1:6.12.88-119.160.amzn2023
Fixed in:1:6.12.88-119.160.amzn2023
bpftool6.18Amazon
Fixed in:1:6.18.30-61.119.amzn2023
Fixed in:1:6.18.30-61.119.amzn2023
bpftool6.18-debuginfoAmazon
Fixed in:1:6.18.30-61.119.amzn2023
Fixed in:1:6.18.30-61.119.amzn2023
kernelAmazon
Fixed in:0:4.14.355-282.731.amzn2
Fixed in:0:4.14.355-282.731.amzn2
Fixed in:1:6.1.172-216.339.amzn2023
Fixed in:1:6.1.172-216.339.amzn2023
kernel-debuginfoAmazon
Fixed in:0:4.14.355-282.731.amzn2
Fixed in:0:4.14.355-282.731.amzn2
Fixed in:1:6.1.172-216.339.amzn2023
Fixed in:1:6.1.172-216.339.amzn2023
kernel-debuginfo-common-aarch64Amazon
Fixed in:0:4.14.355-282.731.amzn2
Fixed in:1:6.1.172-216.339.amzn2023
kernel-debuginfo-common-x86_64Amazon
Fixed in:0:4.14.355-282.731.amzn2
Fixed in:1:6.1.172-216.339.amzn2023
kernel-develAmazon
Fixed in:0:4.14.355-282.731.amzn2
Fixed in:0:4.14.355-282.731.amzn2
Fixed in:1:6.1.172-216.339.amzn2023
Fixed in:1:6.1.172-216.339.amzn2023
kernel-headersAmazon
Fixed in:0:4.14.355-282.731.amzn2
Fixed in:0:4.14.355-282.731.amzn2
Fixed in:0:4.14.355-282.731.amzn2
Fixed in:1:6.1.172-216.339.amzn2023
Fixed in:1:6.1.172-216.339.amzn2023
kernel-livepatch-4.14.355-282.731Amazon
Fixed in:0:1.0-0.amzn2
kernel-livepatch-6.1.172-216.339Amazon
Fixed in:1:1.0-0.amzn2023
Fixed in:1:1.0-0.amzn2023
kernel-livepatch-6.12.88-119.160Amazon
Fixed in:1:1.0-0.amzn2023
Fixed in:1:1.0-0.amzn2023
kernel-livepatch-6.18.30-61.119Amazon
Fixed in:1:1.0-0.amzn2023
Fixed in:1:1.0-0.amzn2023
kernel-modules-extraAmazon
Fixed in:1:6.1.172-216.339.amzn2023
Fixed in:1:6.1.172-216.339.amzn2023
kernel-modules-extra-commonAmazon
Fixed in:1:6.1.172-216.339.amzn2023
Fixed in:1:6.1.172-216.339.amzn2023
kernel-toolsAmazon
Fixed in:0:4.14.355-282.731.amzn2
Fixed in:0:4.14.355-282.731.amzn2
Fixed in:1:6.1.172-216.339.amzn2023
Fixed in:1:6.1.172-216.339.amzn2023
kernel-tools-debuginfoAmazon
Fixed in:0:4.14.355-282.731.amzn2
Fixed in:0:4.14.355-282.731.amzn2
Fixed in:1:6.1.172-216.339.amzn2023
Fixed in:1:6.1.172-216.339.amzn2023
kernel-tools-develAmazon
Fixed in:0:4.14.355-282.731.amzn2
Fixed in:0:4.14.355-282.731.amzn2
Fixed in:1:6.1.172-216.339.amzn2023
Fixed in:1:6.1.172-216.339.amzn2023
kernel6.12Amazon
Fixed in:1:6.12.88-119.160.amzn2023
Fixed in:1:6.12.88-119.160.amzn2023
kernel6.12-debuginfoAmazon
Fixed in:1:6.12.88-119.160.amzn2023
Fixed in:1:6.12.88-119.160.amzn2023
kernel6.12-debuginfo-common-aarch64Amazon
Fixed in:1:6.12.88-119.160.amzn2023
kernel6.12-debuginfo-common-x86_64Amazon
Fixed in:1:6.12.88-119.160.amzn2023
kernel6.12-develAmazon
Fixed in:1:6.12.88-119.160.amzn2023
Fixed in:1:6.12.88-119.160.amzn2023
kernel6.12-headersAmazon
Fixed in:1:6.12.88-119.160.amzn2023
Fixed in:1:6.12.88-119.160.amzn2023
kernel6.12-modules-extraAmazon
Fixed in:1:6.12.88-119.160.amzn2023
Fixed in:1:6.12.88-119.160.amzn2023
kernel6.12-modules-extra-commonAmazon
Fixed in:1:6.12.88-119.160.amzn2023
Fixed in:1:6.12.88-119.160.amzn2023
kernel6.12-toolsAmazon
Fixed in:1:6.12.88-119.160.amzn2023
Fixed in:1:6.12.88-119.160.amzn2023

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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

Exploit Intelligence

0.38%probability of exploitation in 30 days
31stpercentile

Low risk: more likely to be exploited than 31% of all known CVEs.

References

Third-Party Advisory2

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2024-3400Critical10.0100%KEV + Ransom-
CVE-2021-45105Medium5.9100%-Fix
CVE-2021-44228Critical10.0100%KEV + RansomFix
CVE-2021-21985Critical9.8100%KEV + RansomFix
CVE-2020-3452High7.5100%KEVFix
CVE-2018-7600Critical9.8100%KEV + RansomFix

Common questions

How do I fix CVE-2026-46243?

Published advisories record a fix for 416 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-46243 being actively exploited?

Not that we know of. CVE-2026-46243 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.38% is the estimated probability that it will be exploited in the next 30 days. That is higher than 31% of all scored CVEs.

How severe is CVE-2026-46243?

CVE-2026-46243 has a CVSS v3 base score of 7.8, rated important. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-46243 affect?

Published advisories record a fix for bpftool (Amazon), bpftool-debuginfo (Amazon), bpftool6.12 (Amazon), bpftool6.12-debuginfo (Amazon), and 412 more. The list on this page is capped, so there may be more.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-07.