CVE-2015-7550

Severity Score

5.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The keyctl_read_key function in security/keys/keyctl.c in the Linux kernel before 4.3.4 does not properly use a semaphore, which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via a crafted application that leverages a race condition between keyctl_revoke and keyctl_read calls.

La función keyctl_read_key en security/keys/keyctl.c en el kernel de Linux en versiones anteriores a 4.3.4 no utiliza adecuadamente un semáforo, lo que permite a usuarios locales provocar una denegación de servicio (referencia a puntero NULL y caída del sistema) o posiblemente tiene otro impacto no especificado a través de una aplicación manipulada que aprovecha una condición de carrera entre llamadas keyctl_revoke y keyctl_read.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2015-09-29 CVE Reserved
2016-01-05 CVE Published
2023-03-08 EPSS Updated
2024-08-06 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CAPEC

References (16)

URL	Tag	Source
http://www.securityfocus.com/bid/79903	Vdb Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1291197	X_refsource_confirm
https://github.com/torvalds/linux/commit/b4a1b4f5047e4f54e194681125c74c0aa64d637d	X_refsource_confirm
https://security-tracker.debian.org/tracker/CVE-2015-7550	X_refsource_confirm

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b4a1b4f5047e4f54e194681125c74c0aa64d637d	2017-11-04
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html	2017-11-04
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html	2017-11-04
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html	2017-11-04
http://www.debian.org/security/2016/dsa-3434	2017-11-04
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.4	2017-11-04
http://www.ubuntu.com/usn/USN-2888-1	2017-11-04
http://www.ubuntu.com/usn/USN-2890-1	2017-11-04
http://www.ubuntu.com/usn/USN-2890-2	2017-11-04
http://www.ubuntu.com/usn/USN-2890-3	2017-11-04
http://www.ubuntu.com/usn/USN-2911-1	2017-11-04
http://www.ubuntu.com/usn/USN-2911-2	2017-11-04

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				<= 4.3.3 Search vendor "Linux" for product "Linux Kernel" and version " <= 4.3.3"		-		Affected