CVE & CISA-KEV CatalogNVD
CVE-2026-46243
HIGH7.8
CVSS v3
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.
How to fix
Remediation Available
linuxDebian
Fixed in:5.10.257-1CVE-2026-46243
Fixed in:6.1.174-1CVE-2026-46243
Fixed in:6.12.90-2CVE-2026-46243
Fixed in:7.0.10-1CVE-2026-46243
bpftoolRed Hat / RHEL
Fixed in:0:3.10.0-1160.153.1.el7RHSA-2026:27729
Fixed in:0:3.10.0-1160.153.1.el7RHSA-2026:27729
Fixed in:0:3.10.0-1160.153.1.el7.ppc64RHSA-2026:27729
Fixed in:0:3.10.0-1160.153.1.el7RHSA-2026:27729
Fixed in:0:4.18.0-477.147.1.el8_8RHSA-2026:26563
Fixed in:0:4.18.0-553.129.1.el8_10RHSA-2026:23258
Fixed in:0:4.18.0-553.129.1.el8_10RHSA-2026:23258
Fixed in:0:4.18.0-477.147.1.el8_8RHSA-2026:26563
bpftoolRocky
Fixed in:0:3.10.0-1160.153.1.el7RHSA-2026:27729
Fixed in:0:3.10.0-1160.153.1.el7RHSA-2026:27729
Fixed in:0:3.10.0-1160.153.1.el7.ppc64RHSA-2026:27729
Fixed in:0:3.10.0-1160.153.1.el7RHSA-2026:27729
Fixed in:0:4.18.0-477.147.1.el8_8RHSA-2026:26563
Fixed in:0:4.18.0-553.129.1.el8_10RHSA-2026:23258
Fixed in:0:4.18.0-553.129.1.el8_10RHSA-2026:23258
Fixed in:0:4.18.0-477.147.1.el8_8RHSA-2026:26563
bpftool-debuginfoRed Hat / RHEL
Fixed in:0:3.10.0-1160.153.1.el7.ppc64RHSA-2026:27729
Fixed in:0:3.10.0-1160.153.1.el7RHSA-2026:27729
Fixed in:0:3.10.0-1160.153.1.el7RHSA-2026:27729
Fixed in:0:3.10.0-1160.153.1.el7RHSA-2026:27729
Fixed in:0:4.18.0-553.129.1.el8_10RHSA-2026:23258
Fixed in:0:4.18.0-553.129.1.el8_10RHSA-2026:23258
Fixed in:0:4.18.0-305.194.1.el8_4RHSA-2026:26535
Fixed in:0:4.18.0-372.196.1.el8_6RHSA-2026:26570
bpftool-debuginfoRocky
Fixed in:0:3.10.0-1160.153.1.el7.ppc64RHSA-2026:27729
Fixed in:0:3.10.0-1160.153.1.el7RHSA-2026:27729
Fixed in:0:3.10.0-1160.153.1.el7RHSA-2026:27729
Fixed in:0:3.10.0-1160.153.1.el7RHSA-2026:27729
Fixed in:0:4.18.0-477.147.1.el8_8RHSA-2026:26563
Fixed in:0:4.18.0-477.147.1.el8_8RHSA-2026:26563
Fixed in:0:4.18.0-553.129.1.el8_10RHSA-2026:23258
Fixed in:0:4.18.0-553.129.1.el8_10RHSA-2026:23258
kernelRed Hat / RHEL
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
kernelRocky
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
kernel-64kRocky
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
kernel-64kRed Hat / RHEL
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
kernel-64k-coreRocky
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
kernel-64k-coreRed Hat / RHEL
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
kernel-64k-debugRed Hat / RHEL
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
kernel-64k-debugRocky
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
kernel-64k-debug-coreRed Hat / RHEL
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
kernel-64k-debug-coreRocky
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
kernel-64k-debug-debuginfoRocky
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
kernel-64k-debug-debuginfoRed Hat / RHEL
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
kernel-64k-debug-develRed Hat / RHEL
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
kernel-64k-debug-develRocky
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
kernel-64k-debug-devel-matchedRocky
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
kernel-64k-debug-devel-matchedRed Hat / RHEL
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
kernel-64k-debug-modulesRocky
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
kernel-64k-debug-modulesRed Hat / RHEL
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
kernel-64k-debug-modules-coreRocky
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
kernel-64k-debug-modules-coreRed Hat / RHEL
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
kernel-64k-debug-modules-extraRocky
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
kernel-64k-debug-modules-extraRed Hat / RHEL
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
kernel-64k-debuginfoRed Hat / RHEL
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
kernel-64k-debuginfoRocky
Fixed in:0:6.12.0-231.12.el10nvRHSA-2026:33486
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-212.9.el10nvRHSA-2026:23395
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
kernel-64k-develRocky
Fixed in:0:6.12.0-55.79.1.el10_0RHSA-2026:25908
Fixed in:0:6.12.0-211.20.1.el10_2RHSA-2026:23329
Fixed in:0:5.14.0-687.13.1.el9_8RHSA-2026:24381
Fixed in:0:5.14.0-570.123.1.el9_6RHSA-2026:27708
Fixed in:0:5.14.0-427.132.1.el9_4RHSA-2026:27735
Fixed in:0:5.14.0-284.176.1.el9_2RHSA-2026:26515
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
Patch8
Third-Party Advisory2
Other references37
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- bugzilla.redhat.com
- security.access.redhat.com
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| CVE-2021-21985 | Critical | 9.8 | 100% | KEV + Ransom | Fix |
| CVE-2020-3452 | High | 7.5 | 100% | KEV | Fix |
| CVE-2018-7600 | Critical | 9.8 | 100% | KEV + Ransom | Fix |
Common questions
How do I fix CVE-2026-46243?
Published advisories record a fix for 367 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 linux (Debian), bpftool (Red Hat / RHEL), bpftool (Rocky), bpftool-debuginfo (Red Hat / RHEL), and 363 more. The list on this page is capped, so there may be more.
Embed a live status badge for CVE-2026-46243
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<a href="https://tridentstack.com/cve/CVE-2026-46243"><img src="https://tridentstack.com/cve/badge/CVE-2026-46243.svg" alt="CVE-2026-46243"></a>Find and fix vulnerabilities across your fleet
TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.
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.