---
id: CVE-2026-80965
title: 'ALSA: serial-u16550: Check card index validity at probe'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ALSA: serial-u16550: Check card index validity at probe

  serial-u16550 driver blindly trusts that the given devptr->id value is
  within the proper card index range at pr…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-805
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 9caf6b5908e1e3b10478e9201ca1be809145253f <
    41a952304cc8a308748e3f58462c879f2a9c4340
  - >-
    Linux >= 9caf6b5908e1e3b10478e9201ca1be809145253f <
    cc0f757d017f4271f137c77e130314bb23792347
  - >-
    Linux >= 9caf6b5908e1e3b10478e9201ca1be809145253f <
    1cb30691dc893aafcbc1e211e94764014c0f5d12
  - >-
    Linux >= 9caf6b5908e1e3b10478e9201ca1be809145253f <
    487ede9b648fc0eb15866f408c41aac2c57f85d5
  - >-
    Linux >= 9caf6b5908e1e3b10478e9201ca1be809145253f <
    fbf3fb097e66fc1874e54ecc46d600d9325480d6
  - >-
    Linux >= 9caf6b5908e1e3b10478e9201ca1be809145253f <
    7555e83d7738e65dc83921e3c85bbdc081f08f2f
  - >-
    Linux >= 9caf6b5908e1e3b10478e9201ca1be809145253f <
    6d6fdb24fe2eaf6174fc502284c6e1dc5f7242ba
  - >-
    Linux >= 9caf6b5908e1e3b10478e9201ca1be809145253f <
    e0fb960b227fcdebe22e4f26c9486d60943c0424
  - Linux 2.6.16
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:45:49.194Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80965'
references:
  - url: 'https://git.kernel.org/stable/c/41a952304cc8a308748e3f58462c879f2a9c4340'
  - url: 'https://git.kernel.org/stable/c/cc0f757d017f4271f137c77e130314bb23792347'
  - url: 'https://git.kernel.org/stable/c/1cb30691dc893aafcbc1e211e94764014c0f5d12'
  - url: 'https://git.kernel.org/stable/c/487ede9b648fc0eb15866f408c41aac2c57f85d5'
  - url: 'https://git.kernel.org/stable/c/fbf3fb097e66fc1874e54ecc46d600d9325480d6'
  - url: 'https://git.kernel.org/stable/c/7555e83d7738e65dc83921e3c85bbdc081f08f2f'
  - url: 'https://git.kernel.org/stable/c/6d6fdb24fe2eaf6174fc502284c6e1dc5f7242ba'
  - url: 'https://git.kernel.org/stable/c/e0fb960b227fcdebe22e4f26c9486d60943c0424'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80965.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80965'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532257'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80965'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80965'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80965.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00177
epssPercentile: 0.07182
ingestedAt: '2026-09-14T15:23:07.455Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

ALSA: serial-u16550: Check card index validity at probe

serial-u16550 driver blindly trusts that the given devptr->id value is
within the proper card index range at probe.  It's OK for the devices
the driver itself creates at the module probe time, but if the device
is bound manually via sysfs interface, this could be -1 as "none", and
this leads to OOB access for index[] and other parameters.

Add a sanity check for the card index and warn/correct it if it's a
value out of the range.

## Affected

- `Linux >= 9caf6b5908e1e3b10478e9201ca1be809145253f < 41a952304cc8a308748e3f58462c879f2a9c4340`
- `Linux >= 9caf6b5908e1e3b10478e9201ca1be809145253f < cc0f757d017f4271f137c77e130314bb23792347`
- `Linux >= 9caf6b5908e1e3b10478e9201ca1be809145253f < 1cb30691dc893aafcbc1e211e94764014c0f5d12`
- `Linux >= 9caf6b5908e1e3b10478e9201ca1be809145253f < 487ede9b648fc0eb15866f408c41aac2c57f85d5`
- `Linux >= 9caf6b5908e1e3b10478e9201ca1be809145253f < fbf3fb097e66fc1874e54ecc46d600d9325480d6`
- `Linux >= 9caf6b5908e1e3b10478e9201ca1be809145253f < 7555e83d7738e65dc83921e3c85bbdc081f08f2f`
- `Linux >= 9caf6b5908e1e3b10478e9201ca1be809145253f < 6d6fdb24fe2eaf6174fc502284c6e1dc5f7242ba`
- `Linux >= 9caf6b5908e1e3b10478e9201ca1be809145253f < e0fb960b227fcdebe22e4f26c9486d60943c0424`
- `Linux 2.6.16`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80965.json)