CVE-2015-7550
4.9 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:N/I:N/A:C
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.4 Medium
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
10.2%
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.
Affected configurations
References
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b4a1b4f5047e4f54e194681125c74c0aa64d637d
lists.opensuse.org/opensuse-security-announce/2016-03/msg00094.html
lists.opensuse.org/opensuse-security-announce/2016-04/msg00045.html
lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html
www.debian.org/security/2016/dsa-3434
www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.3.4
www.securityfocus.com/bid/79903
www.ubuntu.com/usn/USN-2888-1
www.ubuntu.com/usn/USN-2890-1
www.ubuntu.com/usn/USN-2890-2
www.ubuntu.com/usn/USN-2890-3
www.ubuntu.com/usn/USN-2911-1
www.ubuntu.com/usn/USN-2911-2
bugzilla.redhat.com/show_bug.cgi?id=1291197
github.com/torvalds/linux/commit/b4a1b4f5047e4f54e194681125c74c0aa64d637d
security-tracker.debian.org/tracker/CVE-2015-7550
Related
4.9 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:N/I:N/A:C
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.4 Medium
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
10.2%