CVE-2026-74616: Linux Vulnerability (CVSS 9.8)

Description

In the Linux kernel, the following vulnerability has been resolved: xdp: reject clones that overrun skb_shared_info tailroom xdpf_clone() clones broadcast copies into a single page and sets frame_sz to PAGE_SIZE. __xdp_build_skb_from_frame() later treats that page like a normal XDP frame and expects the usual skb_shared_info tailroom at the end of the buffer. The current check only rejects frames whose linear xdp_frame header, headroom, and packet data exceed PAGE_SIZE. A source frame backed by a larger allocation can still satisfy that check while extending into the clone's required shared-info area. When such a clone is converted back into an skb, build_skb_around() places skb_shared_info over live packet bytes and later writes can corrupt XDP return metadata. Reject clones unless their linear area fits inside SKB_WITH_OVERHEAD(PAGE_SIZE), matching the tailroom requirement already enforced by the XDP-to-skb conversion path.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

0.51%

42.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= e624d4ed4aa8cc3c69d1359b0aaea539203ed266, < 58408982fa39f9758124cec169f42854d6f98f35; >= e624d4ed4aa8cc3c69d1359b0aaea539203ed266, < 685edea27ac68d08fe4dbd3de74b858d2ad8e830; >= e624d4ed4aa8cc3c69d1359b0aaea539203ed266, < ba13763d667e008e185fedf592d53846a5b457d1; >= e624d4ed4aa8cc3c69d1359b0aaea539203ed266, < ef4b7c7046d29a67090de15af0da0d1ae8d1b192; >= e624d4ed4aa8cc3c69d1359b0aaea539203ed266, < fab820f1691a9e26d9031f18aae1e9ce09078f92; >= e624d4ed4aa8cc3c69d1359b0aaea539203ed266, < f463b6f4957c9c3fd1c75f8d3e5af4879fa609c0; >= e624d4ed4aa8cc3c69d1359b0aaea539203ed266, < e48e8edbef2eb824201495daa5234560f632b23c
Linux	Linux	5.14

References

Timeline

Published: Aug 22, 2026
Last Modified: Oct 16, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-74616?

In the Linux kernel, the following vulnerability has been resolved: xdp: reject clones that overrun skb_shared_info tailroom xdpf_clone() clones broadcast copies into a single page and sets frame_sz to PAGE_SIZE. __xdp_build_skb_from_frame() later treats that page like a normal XDP frame and expects the usual skb_shared_info tailroom at the end of the buffer. The current check only rejects frames whose linear xdp_frame header, headroom, and packet data exceed PAGE_SIZE. A source frame backed by a larger allocation can still satisfy that check while extending into the clone's required shared-info area. When such a clone is converted back into an skb, build_skb_around() places skb_shared_info over live packet bytes and later writes can corrupt XDP return metadata. Reject clones unless their linear area fits inside SKB_WITH_OVERHEAD(PAGE_SIZE), matching the tailroom requirement already enforced by the XDP-to-skb conversion path.

How severe is CVE-2026-74616?

CVE-2026-74616 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.

How do I fix CVE-2026-74616?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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