CVE-2026-89634

Last refreshed2026-10-19

Status: UPDATED | Advisory ID: CVE-2026-89634

Key Details

CVE	CVE-2026-89634
CVSS Score / Version	9.1 (Critical) / CVSS v3.1
Updated	2026-10-19
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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 high; integrity impact is none; 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:

smb: client: fix ALIGN() overflow in symlink_data() error context loop

The check added by commit 7d9a7f1f96cd ("smb/client: fix possible

infinite loop and oob read in symlink_data()") compared the post-ALIGN

length against the remaining buffer, but ALIGN() itself can overflow:

for ErrorDataLength near UINT32_MAX (e.g. 0xFFFFFFF9), ALIGN(x, 8)

wraps to 0, so the subsequent bounds check passes, and the loop

advances by zero bytes leaving 'p' pointing into stale data.

Fix by checking the raw ErrorDataLength against the remaining space

before applying ALIGN(), then checking again after. Since raw_len is

bounded by the buffer, raw_len + 7 cannot overflow, so the second check

is an exact post-alignment bounds guard. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89634
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89634

Source

Reference

NVD

CVE