CVE-2026-64056
Race in Linux Cortina/Gemini gmac_rx driver causing kernel memory corruption via shared RX SKB
Is CVE-2026-64056 being exploited?
Not confirmed. CVE-2026-64056 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.55% probability of exploitation in the next 30 days.
How severe is CVE-2026-64056?
CVE-2026-64056 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-64056?
Yes. A fix has been recorded for CVE-2026-64056. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-64056 affect?
CVE-2026-64056 affects Linux kernel (Cortina/Gemini gmac ethernet driver), Embedded devices using Gemini SoC, Network appliances using Cortina driver. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-64056?
Apply vendor/kernel patch immediately and reboot affected hosts.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote packet-induced race can corrupt kernel memory causing panics (DoS) and may enable kernel-level privilege escalation or code execution.
Immediate action required
- affected>= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 and < 27856d533eca3804008695f61c1e4d5ff984196b
- affected>= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 and < b6b22824b30e48ce1df3a2e80990f4b8505deb50
- affected>= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 and < 6bba24e9ebe6f1c0b356cd471e36bdc7fa434897
- affected>= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 and < 3b249988d774dacf13b203817e971934a42243c4
- affected>= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 and < 72158ea185b27afae163949b0e86164cb6b64e55
- affected>= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 and < cfd62907f3cdbc3b6da8f49ba907c0390018fe5e
- affected>= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 and < 67a35e7da7ef9d2f000aa758552a128324c604a0
- affected>= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 and < 06937db21ee311ed07eba47954447245041a982d
- affected4.16
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.