Bug 2517044 (CVE-2026-74559) - CVE-2026-74559 kernel: xsk: drain continuation descs after overflow in xsk_build_skb()
Summary: CVE-2026-74559 kernel: xsk: drain continuation descs after overflow in xsk_bu...
Keywords:
Status: NEW
Alias: CVE-2026-74559
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-15 12:46 UTC by OSIDB Bzimport
Modified: 2026-08-19 18:10 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
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Description OSIDB Bzimport 2026-08-15 12:46:28 UTC
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.

Comment 1 Mauro Matteo Cascella 2026-08-19 18:06:09 UTC
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081552-CVE-2026-74559-0b2d@gregkh/T


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