CVE-2015-7550

MEDIUM

Linux kernel <4.3.4 - DoS

Title source: llm

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.

References (16)

[Vendor Advisory] http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b4a1b4f5047e4f54e194681125c74c0aa64d637d

[Mailing List] http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html

[Mailing List] http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html

[Mailing List] http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html

[Vendor Advisory] http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.4

[Third Party Advisory, VDB Entry] http://www.securityfocus.com/bid/79903

[Vendor Advisory] http://www.ubuntu.com/usn/USN-2888-1

[Vendor Advisory] http://www.ubuntu.com/usn/USN-2890-1

[Vendor Advisory] http://www.ubuntu.com/usn/USN-2890-2

[Vendor Advisory] http://www.ubuntu.com/usn/USN-2890-3

[Vendor Advisory] http://www.ubuntu.com/usn/USN-2911-1

[Vendor Advisory] http://www.ubuntu.com/usn/USN-2911-2

[Issue Tracking] https://bugzilla.redhat.com/show_bug.cgi?id=1291197

[Patch] https://github.com/torvalds/linux/commit/b4a1b4f5047e4f54e194681125c74c0aa64d637d

[Third Party Advisory] http://www.debian.org/security/2016/dsa-3434

[Third Party Advisory] https://security-tracker.debian.org/tracker/CVE-2015-7550

Scores

CVSS v3 5.5

EPSS 0.0005

EPSS Percentile 15.4%

Attack Vector LOCAL

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

Classification

CWE

CWE-362

Status draft

Affected Products (1)

linux/linux_kernel < 4.3.3

Timeline

Published Feb 08, 2016

Tracked Since Feb 18, 2026