CVE-2026-72254

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-72254

Key Details

CVE	CVE-2026-72254
CVSS Score / Version	7.5 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 none; integrity impact is none; 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:

netfilter: nft_fib: reject fib expression on the netdev egress hook

A fib expression in a netdev egress base chain dereferences nft_in(pkt),

NULL on the transmit path, causing a NULL pointer dereference at eval.

nft_fib_validate() masks the hook with NF_INET_* values, but netdev hook

numbers are a separate enum that aliases them (NF_NETDEV_EGRESS ==

NF_INET_LOCAL_IN), so an egress chain passes validation and then faults.

Add nft_fib_netdev_validate() that limits each result/flag to the netdev

hook where the device it reads exists: the input-device cases (OIF,

OIFNAME, ADDRTYPE with F_IIF) to ingress, the output-device case (ADDRTYPE

with F_OIF) to egress, ADDRTYPE with no device flag to both. Also restrict

nft_fib_validate() to NFPROTO_IPV4/IPV6/INET so its NF_INET_* masks are

not applied to another family's hooks. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-72254
CVE	https://www.cve.org/CVERecord?id=CVE-2026-72254

Source

Reference

NVD

CVE