CVE-2026-64355 bpf: Reject fragmented frames in devmap
A memory corruption vulnerability in the Linux kernel's BPF devmap allows attackers to trigger out-of-bounds access via fragmented XDP frames, potentially leading to code execution or system crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64355?
CVE-2026-64355 is a critical memory corruption vulnerability in Linux kernel, published on 25 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
bpf: Reject fragmented frames in devmap
Devmap broadcast redirects clone the packet for all but the last destination.
For native XDP, that clone path copies only the linear xdp_frame data, while fragmented frames keep skb_shared_info in tailroom outside the linear area. Cloning such a frame leaves XDP_FLAGS_HAS_FRAGS set but without valid frag metadata, and the later free path can interpret uninitialized tail data as skb_shared_info, leading to an out-of-bounds access during frame return.
Reject fragmented native XDP frames in dev_map_enqueue_clone().
Add the same restriction to the generic XDP clone path in dev_map_redirect_clone(). Generic XDP represents fragmented packets as nonlinear skbs, and rejecting them here keeps clone-based broadcast support aligned between native and generic XDP.
Which versions are affected by CVE-2026-64355?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64355?
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-2026-64355 being exploited?
There is no known exploitation of CVE-2026-64355 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-93434, BELL-CVE-2026-64355, DEBIAN-CVE-2026-64355, GHSA-vvqh-m3wg-45w7, ROOT-OS-DEBIAN-12-CVE-2026-64355, ROOT-OS-UBUNTU-2204-CVE-2026-64355 and 1 more.