CVE-2026-74597

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-74597

Key Details

CVE	CVE-2026-74597
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-14
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:

ip6_tunnel: clear skb2->cb[] in ip6ip6_err()

ip6ip6_err() clones an outer IPv6 ICMP error skb, pulls it to the

quoted inner IPv6 packet, and then passes the clone to icmpv6_send().

The clone still carries the outer packet's inet6_skb_parm in skb->cb.

If the outer packet had a Home Address Option, IP6CB(skb2)->dsthao

remains non-zero after skb_pull(). icmpv6_send() later calls

mip6_addr_swap(), which uses that stale dsthao offset against the quoted

inner packet. A malformed inner destination-options header can then make

the HAO lookup and address swap run past the end of the quoted packet

and corrupt skb_shared_info.

Clear skb2->cb[] before pulling the quoted inner IPv6 packet so the

reply path does not reuse metadata left by the outer IPv6 stack. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-74597
CVE	https://www.cve.org/CVERecord?id=CVE-2026-74597

Source

Reference

NVD

CVE