CVE-2017-8906

Publication date 11 May 2017

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

An integer underflow vulnerability exists in pixel-a.asm, the x86 assembly code for planeClipAndMax() in MulticoreWare x265 through 2.4, as used by the x265_encoder_encode dependency in libbpg and other products. A small picture can cause an integer underflow, which leads to a Denial of Service in the process of encoding.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
x265	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Not affected
	20.10 groovy	Not affected
	20.04 LTS focal	Not affected
	19.10 eoan	Not affected
	19.04 disco	Not affected
	18.10 cosmic	Not affected
	18.04 LTS bionic	Not affected
	17.10 artful	Ignored end of life
	17.04 zesty	Ignored end of life
	16.10 yakkety	Ignored end of life
	16.04 LTS xenial	Ignored end of standard support, was deferred
	14.04 LTS trusty	Not in release

Notes

msalvatore

Affected code is *NOT* disabled in xenial. Xenial is affected. Upstream has not released a patch, rather, they have "disabled 'planeClipAndMax' assembly primitives"

ccdm94

it seems like upstream has already closed this issue and will be providing a fix for it other than the suggested disabling of the 'planeClipAndMax' assembly primitives. Therefore, considering that this has been deferred for 5+ years and there were no further changes that allow this to be patched in xenial, xenial will be marked as ignored.

Severity score breakdown

CVSS version: CVSS v3.0

Base score 5.5 · Medium

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality impact	None
Integrity impact	None
Availability impact	High

Scores

Parameter	Value
Base score	5.5 · Medium
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H