Kernel-level GENEVE networking flaw can be exploited remotely to crash or leak kernel memory; impacts Linux hosts, cloud overlays and virtualization — broad, high-impact infrastructure risk.
CVE-2026-72408
Linux GENEVE GRO hint flaw enables kernel OOB read causing crash or info leak.
Is CVE-2026-72408 being exploited?
Not confirmed. CVE-2026-72408 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 0.38% probability of exploitation in the next 30 days.
How severe is CVE-2026-72408?
CVE-2026-72408 is rated Critical. 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-2026-72408?
Yes. A fix has been recorded for CVE-2026-72408. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-72408 affect?
CVE-2026-72408 affects Linux kernel (GENEVE tunnel/geneve.c), Cloud overlays (Kubernetes, OpenStack) using GENEVE, Virtualization hosts using GENEVE. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-72408?
Apply kernel/security updates or backport patch; block/disable GENEVE until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker sending crafted GENEVE packets can trigger an out-of-bounds read in the kernel GRO path, causing info disclosure or kernel crash/DoS and possible escalation.
Immediate action required
- affected>= fd0dd796576e1a560e1441e665810129f0a82be0 and < 49c2e7c0a69999a75ef5eaebe1559a20d0b3c15a
- affected>= fd0dd796576e1a560e1441e665810129f0a82be0 and < 2651c174445884ac9e85622aeade9c1f7b98d8e5
- affected7.0
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.