CVE-2026-74744 Affecting kernel-doc package, versions <0:4.18.0-553.171.1.el8_10


Severity

Recommended
high

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.51% (42nd percentile)

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  • Snyk IDSNYK-ROCKY8-KERNELDOC-20552045
  • published7 Oct 2026
  • disclosed26 Aug 2026

Introduced: 26 Aug 2026

CVE-2026-74744  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:8 kernel-doc to version 0:4.18.0-553.171.1.el8_10 or higher.
This issue was patched in RLSA-2026:75747.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-doc package and not the kernel-doc package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:8 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1