bpf: Reject fragmented frames in devmap

Answer in brief

CVE-2026-64355 records a Critical severity (CVSS 9.8) vulnerability in bpf: Reject fragmented frames in devmap. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 25, 2026Updated Sep 4, 2026Source checked Sep 20, 2026First seen by HOL Aug 5, 2026Material review Sep 4, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.8
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <47baddc856ae7e93a565dd9deeb797999b179466 \|\| >=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <07a4c11ee8ef4abcb39d922e9e410ae269671cdf \|\| >=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <bccbab36ff228e0825eb85d9b0f9b8434cd0a399 \|\| >=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <c5b4f5efcb55c1af3fe44ff712d31b7fb098a831 \|\| >=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <a9bb2d9c798cb62a4050a991c27b752770c33afe \|\| >=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <51d07c12ca411e692c424ecdabf077f1e61a61be \|\| >=e624d4ed4aa8cc3c69d1359b0aaea539203ed266 <aa496720618f1a6054f1c870bf10b4f6c99bf656	47baddc856ae7e93a565dd9deeb797999b179466, 07a4c11ee8ef4abcb39d922e9e410ae269671cdf, bccbab36ff228e0825eb85d9b0f9b8434cd0a399, c5b4f5efcb55c1af3fe44ff712d31b7fb098a831, a9bb2d9c798cb62a4050a991c27b752770c33afe, 51d07c12ca411e692c424ecdabf077f1e61a61be, aa496720618f1a6054f1c870bf10b4f6c99bf656
Linux/Linuxgeneric	5.14	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 47baddc856ae7e93a565dd9deeb797999b179466 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 5, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.