CVE-2026-64355
A critical flaw in the Linux kernel’s XDP packet handling can cause an out‑of‑bounds memory read when fragmented packets are cloned. The bug was fixed in a kernel update, but systems still running older kernels are vulnerable.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Linux kernel users that employ XDP (e.g., network drivers, high‑performance packet processing). Typical users include system administrators and network operators managing Linux servers.
Real-world impact
An attacker could trigger a crash or potentially read sensitive memory, leading to denial of service or information disclosure on affected systems.
Why this severity
The CVSS score of 9.8 reflects that the vulnerability is exploitable over the network, requires no special privileges or user interaction, and compromises confidentiality, integrity, and availability of the system.
What to do about it
- 01Update the Linux kernel to a version that includes the fix for CVE-2026-64355.
- 02Reboot the system to load the updated kernel.
NVD-referenced vendor advisory
Timeline
- Jul 25, 2026 · 7d 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/07a4c11ee8ef4abcb3…
- git.kernel.org/stable/c/47baddc856ae7e93a5…
- git.kernel.org/stable/c/51d07c12ca411e692c…
- git.kernel.org/stable/c/a9bb2d9c798cb62a40…
- git.kernel.org/stable/c/aa496720618f1a6054…
- git.kernel.org/stable/c/bccbab36ff228e0825…
- git.kernel.org/stable/c/c5b4f5efcb55c1af3f…