CVE-2026-43190

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-43190

Key Details

CVE	CVE-2026-43190
CVSS Score / Version	8.2 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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 low; integrity impact is none; availability impact is high.
Affected products	Linux Kernel
Classified as	CWE-125 (Out-of-bounds Read)

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: xt_tcpmss: check remaining length before reading optlen

Quoting reporter:

In net/netfilter/xt_tcpmss.c (lines 53-68), the TCP option parser reads

op[i+1] directly without validating the remaining option length.

If the last byte of the option field is not EOL/NOP (0/1), the code attempts

to index op[i+1]. In the case where i + 1 == optlen, this causes an

out-of-bounds read, accessing memory past the optlen boundary

(either reading beyond the stack buffer _opt or the

following payload). (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-43190
CVE	https://www.cve.org/CVERecord?id=CVE-2026-43190

Source

Reference

NVD

CVE