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.
References (8)
Core 8
Core References
Patch, Third Party Advisory x_refsource_confirm
https://github.com/torvalds/linux/commit/a1b14d27ed0965838350f1377ff97c93ee383492
Third Party Advisory vendor-advisory
x_refsource_ubuntu
http://www.ubuntu.com/usn/USN-2947-3
Third Party Advisory vendor-advisory
x_refsource_ubuntu
http://www.ubuntu.com/usn/USN-2947-2
Third Party Advisory vendor-advisory
x_refsource_ubuntu
http://www.ubuntu.com/usn/USN-2947-1
Mailing List, Third Party Advisory mailing-list
x_refsource_mlist
http://www.openwall.com/lists/oss-security/2016/02/14/1
Issue Tracking, Third Party Advisory x_refsource_confirm
https://bugzilla.redhat.com/show_bug.cgi?id=1308452
Patch, Vendor Advisory x_refsource_confirm
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a1b14d27ed0965838350f1377ff97c93ee383492
Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00015.html
Scores
CVSS v3
5.5
EPSS
0.0008
EPSS Percentile
24.4%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Details
Status
published
Products (5)
canonical/ubuntu_linux
14.04
canonical/ubuntu_linux
15.10
linux/linux_kernel
4.5.0 rc1 (3 CPE variants)
linux/linux_kernel
< 4.5.0
opensuse/leap
42.1
Published
Apr 27, 2016
Tracked Since
Feb 18, 2026