CVE-2026-64530
A critical flaw in the Linux kernel’s traffic control subsystem can be triggered by sending specially crafted fragmented packets, causing a use‑after‑free of a packet buffer. The bug occurs when the kernel mis‑handles a TC_ACT_CONSUMED return value, leading to a dangling skb. The issue has been fixed in recent kernel releases.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Linux kernel users running a version before the fix, typically system administrators and operators of Linux servers.
Real-world impact
An attacker could send crafted fragmented packets to a vulnerable system, causing a crash or potentially executing arbitrary code, resulting in denial of service or remote code execution.
Why this severity
The CVSS score of 9.8 reflects the vulnerability’s high impact on confidentiality, integrity, and availability, and the fact that it can be exploited remotely without authentication or user interaction.
What to do about it
- 01Upgrade the Linux kernel to a version that includes the fix for CVE-2026-64530.
- 02Reboot the system to load the new kernel.
NVD description indicates the vulnerability has been resolved
Timeline
- Jul 26, 2026 · 6d agoPublishedDisclosed and added to the National Vulnerability Database.
- Jul 27, 2026 · 5d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.
How it’s attacked
References & advisories
- git.kernel.org/stable/c/2140c2f3f2e7b066e1…
- git.kernel.org/stable/c/447d493034a9cf7bf1…
- git.kernel.org/stable/c/5ed3d6f85991656667…
- git.kernel.org/stable/c/a8a02897f2b479127d…
- git.kernel.org/stable/c/e1270e69dcf2c3512c…
- git.kernel.org/stable/c/e28aedab9488343924…
- git.kernel.org/stable/c/f42e8134a3a1074b83…