bpf: Reject fragmented frames in devmap

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Summary

CVECVE-2026-64355
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:17 UTC
Updated2026-07-27 05:16:43 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.005020000 probability, percentile 0.400370000 (date 2026-07-27)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 47baddc856ae7e93a565dd9deeb797999b179466 git Not specified
CNA Linux Linux affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 07a4c11ee8ef4abcb39d922e9e410ae269671cdf git Not specified
CNA Linux Linux affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 bccbab36ff228e0825eb85d9b0f9b8434cd0a399 git Not specified
CNA Linux Linux affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 c5b4f5efcb55c1af3fe44ff712d31b7fb098a831 git Not specified
CNA Linux Linux affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 a9bb2d9c798cb62a4050a991c27b752770c33afe git Not specified
CNA Linux Linux affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 51d07c12ca411e692c424ecdabf077f1e61a61be git Not specified
CNA Linux Linux affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 aa496720618f1a6054f1c870bf10b4f6c99bf656 git Not specified
CNA Linux Linux affected 5.14 Not specified
CNA Linux Linux unaffected 5.14 semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/51d07c12ca411e692c424ecdabf077f1e61a61be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/47baddc856ae7e93a565dd9deeb797999b179466 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a9bb2d9c798cb62a4050a991c27b752770c33afe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/07a4c11ee8ef4abcb39d922e9e410ae269671cdf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c5b4f5efcb55c1af3fe44ff712d31b7fb098a831 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bccbab36ff228e0825eb85d9b0f9b8434cd0a399 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aa496720618f1a6054f1c870bf10b4f6c99bf656 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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