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Vulnerabilities

Vulnerability · CVE-2026-46086

In the Linux kernel, the following vulnerability has been resolved: net: bridge: use a stable FDB dst snapshot in RCU readers Local FDB entries can be rewritten in pla…

Published May 27, 2026 · catalog updated Oct 15, 2026 · linux kernel

Check if you run it

No confirmed exploitation is on record for CVE-2026-46086. EPSS is 0.13%. Act only if a listed version of linux kernel is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.13%
Remediation
Advisory link
Affected products
cpe linux/linux kernel

In the Linux kernel, the following vulnerability has been resolved: net: bridge: use a stable FDB dst snapshot in RCU readers Local FDB entries can be rewritten in place by , which updates to another port or to while keeping the entry alive. Several bridge RCU readers inspect , including through the sysfs path. These readers currently load multiple times and can therefore observe inconsistent values across the check and later dereference. In , this means a concurrent local-FDB update can change after the NULL check and before the dereference, leading to a NULL-ptr-deref. Fix this by taking a single snapshot of in each affected RCU reader and using that snapshot for the rest of the access sequence. Also publish the in-place updates in with so the readers and writer use matching access patterns.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe linux/linux kernel3.14

How to fix CVE-2026-46086

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-46086. EPSS is 0.13%. Act only if a listed version of linux kernel is installed.

Which versions are affected?

Compare what you have installed with linux/linux kernel 3.14. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-476: NULL Pointer Dereference. EPSS 0.13%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 27, 2026 · NIST NVD

    Detected

    In the Linux kernel, the following vulnerability has been resolved: net: bridge: use a stable FDB dst snapshot in RCU readers Local FDB entries can be rewritten in place by , which updates to another port or to while keeping the entry alive. Several bridge RCU readers inspect , including through the sysfs path. These readers currently load multiple times and can therefore observe inconsistent valu

  2. Oct 15, 2026 · NIST NVD

    Updated

    In the Linux kernel, the following vulnerability has been resolved: net: bridge: use a stable FDB dst snapshot in RCU readers Local FDB entries can be rewritten in place by , which updates to another port or to while keeping the entry alive. Several bridge RCU readers inspect , including through the sysfs path. These readers currently load multiple times and can therefore observe inconsistent valu

Sources

  • CVE.orgVulnerability recordCVE-2026-46086

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-46086

    30-day exploitation probability 0.1%

    first.org
  • NIST NVDVulnerability recordCVE-2026-46086

    In the Linux kernel, the following vulnerability has been resolved: net: bridge: use a stable FDB dst snapshot in RCU readers Local FDB entries can be rewritten in place by , which updates to another port or to while keeping the entry alive.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.