xsk: drain continuation descs after overflow in xsk_build_skb() (CVE-2026-74559) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-74559

xsk: drain continuation descs after overflow in xsk_build_skb()

Answer in brief

CVE-2026-74559 records a Unknown severity vulnerability in xsk: drain continuation descs after overflow in xsk_build_skb(). 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 Aug 15, 2026Updated Aug 17, 2026Source checked Sep 29, 2026First seen by HOL Aug 15, 2026Material review Aug 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. 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.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=cf24f5a5feeaae34c1a34d1e04f8ac697290427a <ceb00cb87a22c42d20c39336213db2b843ca9e34 \|\| >=cf24f5a5feeaae34c1a34d1e04f8ac697290427a <5e94d74e4f3baebaa083288f33b4be7ce0a34982 \|\| >=cf24f5a5feeaae34c1a34d1e04f8ac697290427a <bd44a6dcd4248883de90f5dad53ae80066e27096	ceb00cb87a22c42d20c39336213db2b843ca9e34, 5e94d74e4f3baebaa083288f33b4be7ce0a34982, bd44a6dcd4248883de90f5dad53ae80066e27096
Linux/Linuxgeneric	6.6	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to ceb00cb87a22c42d20c39336213db2b843ca9e34 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 15, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: xsk: drain continuation descs after overflow in xsk_build_skb() Fix generic xmit path multi-buffer logic when packets are either too big (count of descriptors exceed MAX_SKB_FRAGS) or an invalid descriptor is included in fragmented packet. Introduce xdp_sock::drain_cont and act upon this flag - when it is set, keep on consuming descriptors from AF_XDP Tx ring and put them directly onto Cq. Previously these descriptors were silently lost and could never be reached again.

Quoted source text, attributed separately from HOL analysis.