CVE-2026-63912

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-63912

Key Details

CVE	CVE-2026-63912
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:

xfrm: esp: restore combined single-frag length gate

The ESP out-of-place fast path appends the trailer in esp_output_head()

before esp_output_tail() allocates the destination page frag. The

head-side gate currently checks skb->data_len and tailen separately, but

the tail code allocates a single destination frag from the combined

post-trailer skb->data_len.

Reject the page-frag fast path when the combined aligned length exceeds a

page. Otherwise skb_page_frag_refill() may fall back to a single page while

the destination sg still spans the combined skb->data_len.

Restore this combined-length page gate for both IPv4 and IPv6. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-63912
CVE	https://www.cve.org/CVERecord?id=CVE-2026-63912

Source

Reference

NVD

CVE