What’s Vulnerable › Vulnerabilities

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

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-21

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.

Affected products

• Linux kernel: 6.6 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/5e94d74e4f3baebaa083288f33b4be7ce0a34982
• https://git.kernel.org/stable/c/bd44a6dcd4248883de90f5dad53ae80066e27096
• https://git.kernel.org/stable/c/ceb00cb87a22c42d20c39336213db2b843ca9e34
• https://git.kernel.org/stable/c/ecd0d1cde0478c232a867f14ec99cf97aff5eb30

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