CVE-2026-63999 ethtool: rss: fix indir_table and hkey leak on get_rxfh failure
A memory leak in the Linux kernel's ethtool RSS handling allows attackers to cause denial of service by triggering allocation failures.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-63999?
CVE-2026-63999 is a medium-severity memory corruption vulnerability in Linux kernel, published on 19 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ethtool: rss: fix indir_table and hkey leak on get_rxfh failure
rss_prepare_get() allocates the indirection table and hash key buffer via rss_get_data_alloc(), then calls ops->get_rxfh() to populate them. If get_rxfh() fails, the function returns an error without freeing the allocation.
Weakness: CWE-401
Which versions are affected by CVE-2026-63999?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-63999?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-63999 being exploited?
There is no known exploitation of CVE-2026-63999 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-92817, BELL-CVE-2026-63999, DEBIAN-CVE-2026-63999, GHSA-9pm4-3wgp-cph8, ROOT-OS-DEBIAN-12-CVE-2026-63999, ROOT-OS-UBUNTU-2204-CVE-2026-63999 and 1 more.