CVE-2026-64464 xhci: sideband: fix ring sg table pages leak
A memory leak in the Linux kernel xhci sideband driver allows local attackers to exhaust system memory, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64464?
CVE-2026-64464 is a memory corruption vulnerability in Linux, published on 25 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:
xhci: sideband: fix ring sg table pages leak
xhci_ring_to_sgtable() allocates a temporary pages array and uses it to build the returned sg_table with sg_alloc_table_from_pages().
The error paths free the pages array, but the success path returns the sg_table without freeing it. This leaks the temporary array every time a sideband client gets an endpoint or event ring buffer.
Free the pages array after sg_alloc_table_from_pages() succeeds. The returned sg_table has its own scatterlist entries and does not depend on the temporary array after construction.
Which versions are affected by CVE-2026-64464?
How do I fix CVE-2026-64464?
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-2026-64464 being exploited?
There is no known exploitation of CVE-2026-64464 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-64464, DEBIAN-CVE-2026-64464, GHSA-w244-36cw-6gvr, ROOT-OS-UBUNTU-2204-CVE-2026-64464, UBUNTU-CVE-2026-64464.