Summary
USN-3836-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu
16.04 LTS.
Jann Horn discovered that the Linux kernel mishandles mapping UID or GID
ranges inside nested user namespaces in some situations. A local attacker
could use this to bypass access controls on resources outside the
namespace. (CVE-2018-18955)
Philipp Wendler discovered that the overlayfs implementation in the Linux
kernel did not properly verify the directory contents permissions from
within a unprivileged user namespace. A local attacker could use this to
expose sensitive information (protected file names). (CVE-2018-6559)
Fixed packages 2
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 16.04 LTS 16.04:LTS | linux-gcp | 4.15.0-1025.26~16.04.1 |
| Ubuntu · 16.04 LTS 16.04:LTS | linux-hwe | 4.15.0-42.45~16.04.1 |
Vulnerabilities 2
-
Unscored —CVE-2018-18955 Public exploit
In the Linux kernel 4.15.x through 4.19.x before 4.19.2, map_write() in kernel/user_namespace.c allows privilege escala…
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Unscored —
The Linux kernel, as used in Ubuntu 18.04 LTS and Ubuntu 18.10, allows local users to obtain names of files in which th…