Vulnary
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Critical· 9.3official fix available

CVE-2026-64034

The Linux kernel's mana network driver contains a TOCTOU double-fetch vulnerability where a hardware-modifiable DMA value can be changed between validation and use, potentially leading to out-of-bounds access. The issue has been fixed by reading the value once with READ_ONCE() and passing the validated copy to the handler. Users should apply the official kernel patch or upgrade to a kernel version that includes this fix.

publishedJul 19, 2026
last modifiedJul 30, 2026
sourcesNVD
severity · cvss
9.3
critical · how bad it is
exploitation · epss
<1%
5th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Aug 19, 2026

An official fix is available, so this entry is kept for 30 days and then removed automatically.

01

Who is affected

Linux systems using the mana network driver (specific product versions not listed in the source).

02

Real-world impact

An attacker with the ability to modify the DMA buffer could bypass bounds checks, leading to possible memory corruption, privilege escalation, or denial of service.

03

Why this severity

CVSS v3.1 base score 9.3 (Critical) due to low attack complexity, no privileges or user interaction required, and high impacts to confidentiality, integrity, and availability.

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade the Linux kernel to a version that includes the patch for CVE-2026-64034 (e.g., apply the fix that reads hwc_msg_id once using READ_ONCE()).

NVD-referenced vendor advisory

05

Timeline

  1. Jul 19, 2026 · 14d ago
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Jul 20, 2026 · 13d ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
  3. Jul 30, 2026 · 3d ago
    Advisory updated
    The NVD record was last revised.
06

How it’s attacked

Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeChanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
07

References & advisories

NVD advisory ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →