CVE-2026-64319
Linux kernel nvmet-auth OOB heap read via crafted NVMe-oF DHCHAP_REPLY
Is CVE-2026-64319 being exploited?
Not confirmed. CVE-2026-64319 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 0.52% probability of exploitation in the next 30 days.
How severe is CVE-2026-64319?
CVE-2026-64319 is rated Critical with a CVSS score of 9.1. 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-2026-64319?
Yes. A fix has been recorded for CVE-2026-64319. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-64319 affect?
CVE-2026-64319 affects Linux kernel nvmet (NVMe-oF target) with nvmet-auth, Linux distributions with nvmet-auth/DHCHAP enabled, Storage systems using Linux-based NVMe-oF targets. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-64319?
Apply kernel/security updates; restrict NVMe-oF access or disable nvmet-auth until patched
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Pre-auth remote out-of-bounds heap read in nvmet-auth via crafted DHCHAP_REPLY; may leak kernel memory and cause DoS (information disclosure, instability).
Patch when possible
- affected>= db1312dd95488b5e6ff362ff66fcf953a46b1821 and < 80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0
- affected>= db1312dd95488b5e6ff362ff66fcf953a46b1821 and < 999f6205ede984a786f35f727b01f971b98e215d
- affected>= db1312dd95488b5e6ff362ff66fcf953a46b1821 and < 6d7649c1231dac14d906985d2936967e23041c26
- affected>= db1312dd95488b5e6ff362ff66fcf953a46b1821 and < caa71b3a43ea5c13fe7141cb019ebcb03b8ac857
- affected>= db1312dd95488b5e6ff362ff66fcf953a46b1821 and < 3a413ece2504c70aa34a20be4dafec04e8c741f9
- affected6.0
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.