CVE-2026-43185

Last refreshed2026-10-23

Status: UPDATED | Advisory ID: CVE-2026-43185

Key Details

CVE	CVE-2026-43185
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-21
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
Classified as	CWE-674 (Uncontrolled Recursion)

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:

ksmbd: fix signededness bug in smb_direct_prepare_negotiation()

smb_direct_prepare_negotiation() casts an unsigned __u32 value

from sp->max_recv_size and req->preferred_send_size to a signed

int before computing min_t(int, ...). A maliciously provided

preferred_send_size of 0x80000000 will return as smaller than

max_recv_size, and then be used to set the maximum allowed

alowed receive size for the next message.

By sending a second message with a large value (>1420 bytes)

the attacker can then achieve a heap buffer overflow.

This fix replaces min_t(int, ...) with min_t(u32) (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-43185
CVE	https://www.cve.org/CVERecord?id=CVE-2026-43185

Source

Reference

NVD

CVE