CVE-2026-93830 Linux Kernel - Denial of Service

Linux kernel net: stmmac xgmac2 contains an interrupt storm vulnerability caused by enabling RX Buffer Unavailable (RBUE) interrupt in default RX interrupt mask, letting attackers trigger MAC interrupt storms under heavy RX pressure, exploit requires heavy RX traffic conditions.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.49% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
24 September 2026
Updated
15 October 2026

Vendor fix

Update to the Linux kernel version that disables RBUE in the default RX interrupt mask for xgmac2 devices.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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