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CVE-2026-64355

bpf: Reject fragmented frames in devmap

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: total

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From e624d4ed4aa8cc3c69d1359b0aaea539203ed266 · fixed in 47baddc856ae7e93a565dd9deeb797999b179466; From e624d4ed4aa8cc3c69d1359b0aaea539203ed266 · fixed in 07a4c11ee8ef4abcb39d922e9e410ae269671cdf; From e624d4ed4aa8cc3c69d1359b0aaea539203ed266 · fixed in bccbab36ff228e0825eb85d9b0f9b8434cd0a399; From e624d4ed4aa8cc3c69d1359b0aaea539203ed266 · fixed in c5b4f5efcb55c1af3fe44ff712d31b7fb098a831; From e624d4ed4aa8cc3c69d1359b0aaea539203ed266 · fixed in a9bb2d9c798cb62a4050a991c27b752770c33afe; From e624d4ed4aa8cc3c69d1359b0aaea539203ed266 · fixed in 51d07c12ca411e692c424ecdabf077f1e61a61be; From e624d4ed4aa8cc3c69d1359b0aaea539203ed266 · fixed in aa496720618f1a6054f1c870bf10b4f6c99bf656

  • Linux Linux

    5.14

  • KernelLinux

    From 5.14.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.96; From 6.13.0 · fixed in 6.18.39; From 6.19.0 · fixed in 7.1.4

References 7

git.kernel.org