CVE-2026-74744

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-74744

Key Details

CVE	CVE-2026-74744
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

In the Linux kernel, the following vulnerability has been resolved:

ipvlan: inherit needed_headroom and needed_tailroom from phy_dev

ipvlan devices inherit hard_header_len from phy_dev during ipvlan_init(),

but leave needed_headroom and needed_tailroom set to 0.

When the underlying phy_dev (or stacked lower device) requires extra headroom

or tailroom for headers/trailers (e.g. macsec, ipsec, wireguard, tunnels, or

veth with rx headroom), upper layers calculating packet headroom and tailroom

fail to reserve sufficient space.

This can result in reallocation overhead, skb headroom underflows, or KASAN

slab-use-after-free crashes when dev_hard_header() / ipvlan_hard_header()

prepends header data or when lower devices append tailroom.

Fix this by:

1. Inheriting needed_headroom and needed_tailroom from phy_dev in ipvlan_init().

2. Propagating needed_headroom and needed_tailroom updates to attached ipvlans

in ipvlan_device_event() when receiving NETDEV_FEAT_CHANGE events. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-74744
CVE	https://www.cve.org/CVERecord?id=CVE-2026-74744

Source

Reference

NVD

CVE