CVE-2026-72250

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-72250

Key Details

CVE	CVE-2026-72250
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; 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:

netfilter: nf_conntrack_reasm: guard mac_header adjustment after IPv6 defrag

nf_ct_frag6_reasm() slides the packet head forward to drop the IPv6

fragment header and then unconditionally advances skb->mac_header:

skb->mac_header += sizeof(struct frag_hdr);

On the NF_INET_LOCAL_OUT defrag path the skb has no link-layer header

yet, so skb->mac_header is still the "not set" sentinel (u16)~0U. Adding

sizeof(struct frag_hdr) wraps it to a small value (0xffff + 8 == 7),

after which skb_mac_header_was_set() wrongly reports a MAC header is

present and skb_mac_header() points into the headroom.

The reassembler has done this unconditional add since it was introduced;

it was harmless while mac_header was a bare pointer, but wrong once

mac_header became a u16 offset whose unset state is the ~0U sentinel

tested by skb_mac_header_was_set(). The sibling net/ipv6/reassembly.c

does the same relocation and does guard the adjustment; mirror the

guard here. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-72250
CVE	https://www.cve.org/CVERecord?id=CVE-2026-72250

Source

Reference

NVD

CVE