[ASA-201811-1] linux: denial of service

[Jelle van der Waa]

Arch Linux Security Advisory ASA-201811-1
=========================================

Severity: Low
Date    : 2018-11-01
CVE-ID  : CVE-2018-18445
Package : linux
Type    : denial of service
Remote  : No
Link    : https://security.archlinux.org/AVG-784

Summary
=======

The package linux before version 4.18.13.arch1-1 is vulnerable to
denial of service.

Resolution
==========

Upgrade to 4.18.13.arch1-1.

# pacman -Syu "linux>=4.18.13.arch1-1"

The problem has been fixed upstream in version 4.18.13.arch1.

Workaround
==========

None.

Description
===========

In the Linux kernel 4.14.x before 4.14.75 and 4.18.x before 4.18.13,
faulty computation of numeric bounds in the BPF verifier permits out-
of-bounds memory accesses because adjust_scalar_min_max_vals in
kernel/bpf/verifier.c mishandles 32-bit right shifts.

Impact
======

A local attacker is able to crash the kernel and leak information using
a specially crafted BPF program.

References
==========

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b799207e1e1816b09e7a5920fbb2d5fcf6edd681
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.13
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.75
https://bugs.chromium.org/p/project-zero/issues/detail?id=1686
https://seclists.org/oss-sec/2018/q4/69
https://security.archlinux.org/CVE-2018-18445
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