Vulnary
← back to the feed
Critical· 9.8official fix available

CVE-2026-64268

A bug in the Linux kernel’s RDMA/siw driver let a remote RDMA peer send more data than requested, causing an out‑of‑bounds write. This could crash the system or allow an attacker to run code. The flaw is critical.

publishedJul 25, 2026
last modifiedJul 30, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
49th 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 26, 2026

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

01

Who is affected

Linux kernel systems that have RDMA/siw support enabled, especially those using iWARP over TCP.

02

Real-world impact

An attacker can craft RDMA Read Response segments that overflow a buffer, leading to memory corruption, crashes, or potentially arbitrary code execution on the target system.

03

Why this severity

The CVSS score of 9.8 reflects that the flaw is exploitable remotely with no authentication or user interaction, and it can compromise confidentiality, integrity, and availability of the affected system.

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade to a Linux kernel version that includes the fix for CVE-2026-64268.
  2. 02Restart the system or affected services to load the updated kernel.

NVD description indicates the vulnerability has been resolved in the Linux kernel.

05

Timeline

  1. Jul 25, 2026 · 7d ago
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Jul 27, 2026 · 5d ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
  3. Jul 30, 2026 · 2d ago
    Advisory updated
    The NVD record was last revised.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeUnchanged
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 →