CVE-2015-7550 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Reference

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b4a1b4f5047e4f54e194681125c74c0aa64d637d http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html http://www.debian.org/security/2016/dsa-3434 http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.4 http://www.securityfocus.com/bid/79903 http://www.ubuntu.com/usn/USN-2888-1 http://www.ubuntu.com/usn/USN-2890-1 http://www.ubuntu.com/usn/USN-2890-2 http://www.ubuntu.com/usn/USN-2890-3 http://www.ubuntu.com/usn/USN-2911-1 http://www.ubuntu.com/usn/USN-2911-2 https://bugzilla.redhat.com/show_bug.cgi?id=1291197 https://github.com/torvalds/linux/commit/b4a1b4f5047e4f54e194681125c74c0aa64d637d https://security-tracker.debian.org/tracker/CVE-2015-7550

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.5