What’s Vulnerable › Vulnerabilities

CVE-2016-2383

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2016-04-27 · updated 2026-06-17

Description

The adjust_branches function in kernel/bpf/verifier.c in the Linux kernel before 4.5 does not consider the delta in the backward-jump case, which allows local users to obtain sensitive information from kernel memory by creating a packet filter and then loading crafted BPF instructions.

Affected products

• Canonical Ubuntu Linux: 14.04, 15.10
• Linux kernel: before 4.5.0; 4.5.0-rc1, 4.5.0-rc2, 4.5.0-rc3 — fixed in 4.5.0
• openSUSE Leap: 42.1

How to fix

Upgrade to a fixed version: Linux kernel 4.5.0. Check the vendor advisory for mitigations.

References

• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a1b14d27ed0965838350f1377ff97c93ee383492
• http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00015.html
• http://www.openwall.com/lists/oss-security/2016/02/14/1
• http://www.ubuntu.com/usn/USN-2947-1
• http://www.ubuntu.com/usn/USN-2947-2
• http://www.ubuntu.com/usn/USN-2947-3
• https://bugzilla.redhat.com/show_bug.cgi?id=1308452
• https://github.com/torvalds/linux/commit/a1b14d27ed0965838350f1377ff97c93ee383492
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a1b14d27ed0965838350f1377ff97c93ee383492
• http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00015.html
• http://www.openwall.com/lists/oss-security/2016/02/14/1
• http://www.ubuntu.com/usn/USN-2947-1

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