Linux Kernel TCP stack Use-After-Free Rated 7.8 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-46330

Key Details

CVE	CVE-2026-46330
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-15
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
Classified as	CWE-416 (Use After Free)
Exploitation prediction (EPSS)	0.11% probability of exploitation in the next 30 days (1% percentile) -- FIRST.org's EPSS model.

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:

Revert "net/smc: Introduce TCP ULP support"

This reverts commit d7cd421da9da2cc7b4d25b8537f66db5c8331c40.

As reported by Al Viro, the TCP ULP support for SMC is fundamentally

broken. The implementation attempts to convert an active TCP socket

into an SMC socket by modifying the underlying `struct file`, dentry,

and inode in-place, which violates core VFS invariants that assume

these structures are immutable for an open file, creating a risk of

use after free errors and general system instability.

Given the severity of this design flaw and the fact that cleaner

alternatives (e.g., LD_PRELOAD, BPF) exist for legacy application

transparency, the correct course of action is to remove this feature

entirely. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-46330
CVE	https://www.cve.org/CVERecord?id=CVE-2026-46330

Source

Reference

NVD

CVE