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 · updated Oct 15, 2026 · 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.
Code
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Timeline
Detection, updates, and resolution for this record.
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
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
Affected
- cpe linux/linux kernelversion unspecified
- cpe linux/linux kernel3.14
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