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Critical· 9.8official fix available

CVE-2026-64033

A critical use‑after‑free bug in the Linux kernel’s RDMA/rtrs subsystem could let an attacker crash the system or potentially execute code. The flaw occurs during cleanup of sysfs entries when a path creation fails. It has been fixed in a kernel update.

publishedJul 19, 2026
last modifiedJul 30, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
39th 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 kernel, any distribution using a kernel version before the patch that contains the RDMA/rtrs use‑after‑free fix. Typical users are system administrators and servers running affected kernels.

02

Real-world impact

An attacker could trigger a crash or potentially run arbitrary code by causing the kernel to dereference freed memory during RDMA path cleanup. This could lead to denial of service or privilege escalation.

03

Why this severity

The CVSS score of 9.8 reflects the lack of authentication or user interaction needed, the high impact on confidentiality, integrity, and availability, and the low complexity of exploitation.

04

What to do about it

official fix available
recommended steps
  1. 011. Update the Linux kernel to a version that includes the RDMA/rtrs use‑after‑free fix.
  2. 022. Verify the kernel version with 'uname -r' and confirm it is newer than the vulnerable release.

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 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 →
CVE-2026-64033: A critical use‑after‑free bug in the Linux kernel’s RDMA/rtrs subsyste · Vulnary