Privilege escalation in Linux Kernel
CVE-2015-8539
The KEYS subsystem in the Linux kernel before 4.4 allows local users to gain privileges or cause a denial of service (BUG) via crafted keyctl commands that negatively instantiate a key, related to security/keys/encrypted-keys/encrypted.c, security/keys/trusted.c, and security/keys/user_defined.c.
Vulnerability class: Privilege Escalation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (35.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Linux Kernel — versions 4.4
- Canonical Ubuntu Linux — versions 12.04, 14.04
- SUSE Linux Enterprise Real Time Extension — versions 12
Weakness classification (CWE)
References
- lists.opensuse.org/opensuse-security-announce/2016-02/msg00009.html (vendor-advisory, Third Party Advisory)
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- access.redhat.com/errata/RHSA-2018:0181 (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2016-02/msg00034.html (vendor-advisory, Third Party Advisory)
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Vendor Advisory)
- github.com/torvalds/linux/commit/096fe9eaea40a17e125569f9e657e34cdb6d73bd (Patch, Issue Tracking, Vendor Advisory)
- www.openwall.com/lists/oss-security/2015/12/09/1 (mailing-list, Patch, Mailing List, Third Party Advisory, Issue Tracking)
- lists.opensuse.org/opensuse-security-announce/2016-02/msg00017.html (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:0152 (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2016-02/msg00007.html (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2015-8539?
- CVE-2015-8539 is a high-severity vulnerability in Linux Kernel, classified under Improper Privilege Management. CVSS score: 7.8/10. Published 2016-02-08.
- How severe is CVE-2015-8539?
- High severity. CVSS v3 base score is 7.8 out of 10.