CVE-2026-64355

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 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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxe624d4ed4aa8cc3c69d1359b0aaea539203ed266 < 47baddc856ae7e93a565dd9deeb797999b179466affected
LinuxLinuxe624d4ed4aa8cc3c69d1359b0aaea539203ed266 < 07a4c11ee8ef4abcb39d922e9e410ae269671cdfaffected
LinuxLinuxe624d4ed4aa8cc3c69d1359b0aaea539203ed266 < bccbab36ff228e0825eb85d9b0f9b8434cd0a399affected
LinuxLinuxe624d4ed4aa8cc3c69d1359b0aaea539203ed266 < c5b4f5efcb55c1af3fe44ff712d31b7fb098a831affected
LinuxLinuxe624d4ed4aa8cc3c69d1359b0aaea539203ed266 < a9bb2d9c798cb62a4050a991c27b752770c33afeaffected
LinuxLinuxe624d4ed4aa8cc3c69d1359b0aaea539203ed266 < 51d07c12ca411e692c424ecdabf077f1e61a61beaffected
LinuxLinuxe624d4ed4aa8cc3c69d1359b0aaea539203ed266 < aa496720618f1a6054f1c870bf10b4f6c99bf656affected
LinuxLinux5.14affected
LinuxLinux0 < 5.14unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.96 <= 6.12.*unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References