Vulnerability Details : CVE-2016-4558
The BPF subsystem in the Linux kernel before 4.5.5 mishandles reference counts, which allows local users to cause a denial of service (use-after-free) or possibly have unspecified other impact via a crafted application on (1) a system with more than 32 Gb of memory, related to the program reference count or (2) a 1 Tb system, related to the map reference count.
Vulnerability category: Memory CorruptionDenial of service
Exploit prediction scoring system (EPSS) score for CVE-2016-4558
Probability of exploitation activity in the next 30 days: 0.06%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 25 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2016-4558
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
---|---|---|---|---|---|
6.9
|
MEDIUM | AV:L/AC:M/Au:N/C:C/I:C/A:C |
3.4
|
10.0
|
NIST |
7.0
|
HIGH | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.0
|
5.9
|
NIST |
References for CVE-2016-4558
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http://www.ubuntu.com/usn/USN-3005-1
USN-3005-1: Linux kernel (Xenial HWE) vulnerabilities | Ubuntu security noticesThird Party Advisory
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http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.5.5
Vendor Advisory
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http://www.ubuntu.com/usn/USN-3007-1
USN-3007-1: Linux kernel (Raspberry Pi 2) vulnerabilities | Ubuntu security noticesThird Party Advisory
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https://bugzilla.redhat.com/show_bug.cgi?id=1334303
1334303 – (CVE-2016-4558) CVE-2016-4558 kernel: bpf: refcnt overflowIssue Tracking;Third Party Advisory
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http://www.openwall.com/lists/oss-security/2016/05/06/4
oss-security - CVE Requests: Linux: BPF flaws (one use-after-free / local root privilege escalation)Mailing List;Third Party Advisory
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http://www.ubuntu.com/usn/USN-3006-1
USN-3006-1: Linux kernel vulnerabilities | Ubuntu security noticesThird Party Advisory
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http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=92117d8443bc5afacc8d5ba82e541946310f106e
kernel/git/torvalds/linux.git - Linux kernel source treeVendor Advisory
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https://github.com/torvalds/linux/commit/92117d8443bc5afacc8d5ba82e541946310f106e
bpf: fix refcnt overflow · torvalds/linux@92117d8 · GitHubVendor Advisory
Products affected by CVE-2016-4558
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*