High 8.8

CVE-2026-43284

In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: avoid in-place decrypt on shared skb frags MSG_SPLICE_PAGES can attach pages from a pipe directly to an skb. TCP marks such skbs with SKBFL_SHARED_FRAG after skb_splice_from_iter(), so later paths that may modify packet data can first make a private copy. The IPv4/IPv6 datagram append paths did not set this flag when splicing pages into UDP skbs. That leaves an ESP-in-UDP packet made from shared pipe pages looking like an ordinary uncloned nonlinear skb. ESP input then takes the no-COW fast path for uncloned skbs w…

Scores

CVSS out of 10, high severity.

EPSS chance of exploitation in the next 30 days.

The facts

Published

8 May 2026

Last changed

8 September 2026

NVD status

Modified

Severity

High, CVSS 8.8 out of 10 (version 3.1)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Weakness

CWE-123

Affects

linux linux kernel

Known exploited

Not in the CISA Known Exploited Vulnerabilities catalogue in this build.

EPSS

94.2% chance of exploitation activity in the next 30 days (percentile 100).

Is there a Securelyn advisory?

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Scores

The facts

Is there a Securelyn advisory?

References