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Vulnerability record · CVE-2026-64355 · published 25 July 2026

CVE-2026-64355: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

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.

9.8 CVSS 3.1 Critical EPSS 0.51% · top 58.7% CWE-125 · Out-of-bounds read
9.8CVSS 3.1 base score
0.51%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
4 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/07a4c11ee8ef4abcb39d922e9e410ae269671cdf Patch
https://git.kernel.org/stable/c/47baddc856ae7e93a565dd9deeb797999b179466 Patch
https://git.kernel.org/stable/c/51d07c12ca411e692c424ecdabf077f1e61a61be Patch
https://git.kernel.org/stable/c/a9bb2d9c798cb62a4050a991c27b752770c33afe Patch
https://git.kernel.org/stable/c/aa496720618f1a6054f1c870bf10b4f6c99bf656 Patch
https://git.kernel.org/stable/c/bccbab36ff228e0825eb85d9b0f9b8434cd0a399 Patch
https://git.kernel.org/stable/c/c5b4f5efcb55c1af3fe44ff712d31b7fb098a831 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64355), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.