CVE-2015-6831

Publication date 27 August 2015

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

Multiple use-after-free vulnerabilities in SPL in PHP before 5.4.44, 5.5.x before 5.5.28, and 5.6.x before 5.6.12 allow remote attackers to execute arbitrary code via vectors involving (1) ArrayObject, (2) SplObjectStorage, and (3) SplDoublyLinkedList, which are mishandled during unserialization.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
php5	15.04 vivid	Fixed 5.6.4+dfsg-4ubuntu6.3
	14.04 LTS trusty	Fixed 5.5.9+dfsg-1ubuntu4.13
	12.04 LTS precise	Fixed 5.3.10-1ubuntu3.20

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
php5	Upstream: http://git.php.net/?p=php-src.git;a=commit;h=7381b6accc5559b2de039af3a22f6ec1003b03b3 Upstream: http://git.php.net/?p=php-src.git;a=commit;h=c2e197e4efc663ca55f393bf0e799848842286f3 Upstream: http://git.php.net/?p=php-src.git;a=commit;h=863bf294feb9ad425eadb94f288bc7f18673089d

Severity score breakdown

Parameter	Value
Base score	7.3 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	Low
Availability impact	Low
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References

Related Ubuntu Security Notices (USN)

USN-2758-1
PHP vulnerabilities
30 September 2015