CVE-2026-64355
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.
CSIRTS triage
- What
- Fragmented frames are not rejected in the BPF devmap, which could lead to issues.
- Who is affected
- Deployments of the Linux kernel using BPF may be affected.
- Urgency
- Remediation is necessary to prevent potential network issues, though exploitation is not currently known.
- Action
- Monitor for updates regarding this issue.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.50% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all EPSS-scored CVEs.
Advisory coverage (2)
- criticalCVE-2026-64355: In the Linux kernel, the following vulnerability has been resolved: bpf: Reject fragmented fra…nvd · 2026-07-25
- highCVE-2026-64355: bpf: Reject fragmented frames in devmapmsrc · 2026-07-14
External references
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