---
id: CVE-2026-64355
title: |-
  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 …
summary: |-
  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 …
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
published: '2026-07-25'
updated: '2026-07-27'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64355'
references:
  - url: 'https://git.kernel.org/stable/c/07a4c11ee8ef4abcb39d922e9e410ae269671cdf'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/47baddc856ae7e93a565dd9deeb797999b179466'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/51d07c12ca411e692c424ecdabf077f1e61a61be'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a9bb2d9c798cb62a4050a991c27b752770c33afe'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/aa496720618f1a6054f1c870bf10b4f6c99bf656'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bccbab36ff228e0825eb85d9b0f9b8434cd0a399'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c5b4f5efcb55c1af3fe44ff712d31b7fb098a831'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00513
epssPercentile: 0.42545
ingestedAt: '2026-07-27T06:16:50.682Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.