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Ubuntu: 0029-1 Moderate: Kernel Local Exploits and Patch

ubuntu
Calendar Grey August 30, 2017
Dist Ubuntu Esm H88
Updates issued to address various vulnerabilities in the Ubuntu kernel that might enable local exploits. Recommended to update.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

It was discovered that the Linux kernel did not honor the UEFI secure boot

mode when performing a kexec operation. A local attacker could use this to

bypass secure boot restrictions. (CVE-2015-7837)

Huang Weller discovered that the ext4 filesystem implementation in the

Linux kernel mishandled a needs-flushing-before-commit list. A local

attacker could use this to expose sensitive information. (CVE-2017-7495)

Topics%20covered

Topics Covered

security advisory local exploit kernel system patch ubuntu security issues linux

Update Instructions

The problem can be corrected by updating your livepatches to the following
versions:

| Kernel          | Version  | flavors                  |
|-----------------+----------+--------------------------|
| 4.4.0-21.37     | 29.1     | generic, lowlatency      |
| 4.4.0-22.39     | 29.1     | generic, lowlatency      |
| 4.4.0-22.40     | 29.1     | generic, lowlatency      |
| 4.4.0-24.43     | 29.1     | generic, lowlatency      |
| 4.4.0-28.47     | 29.1     | generic, lowlatency      |
| 4.4.0-31.50     | 29.1     | generic, lowlatency      |
| 4.4.0-34.53     | 29.1     | generic, lowlatency      |
| 4.4.0-36.55     | 29.1     | generic, lowlatency      |
| 4.4.0-38.57     | 29.1     | generic, lowlatency      |
| 4.4.0-42.62     | 29.1     | generic, lowlatency      |
| 4.4.0-43.63     | 29.1     | generic, lowlatency      |
| 4.4.0-45.66     | 29.1     | generic, lowlatency      |
| 4.4.0-47.68     | 29.1     | generic, lowlatency      |
| 4.4.0-51.72     | 29.1     | generic, lowlatency      |
| 4.4.0-53.74     | 29.1     | generic, lowlatency      |
| 4.4.0-57.78     | 29.1     | generic, lowlatency      |
| 4.4.0-59.80     | 29.1     | generic, lowlatency      |
| 4.4.0-62.83     | 29.1     | generic, lowlatency      |
| 4.4.0-63.84     | 29.1     | generic, lowlatency      |
| 4.4.0-64.85     | 29.1     | generic, lowlatency      |
| 4.4.0-66.87     | 29.1     | generic, lowlatency      |
| 4.4.0-67.88     | 29.1     | generic, lowlatency      |
| 4.4.0-70.91     | 29.1     | generic, lowlatency      |
| 4.4.0-71.92     | 29.1     | generic, lowlatency      |
| 4.4.0-72.93     | 29.1     | generic, lowlatency      |
| 4.4.0-75.96     | 29.1     | generic, lowlatency      |
| 4.4.0-77.98     | 29.1     | generic, lowlatency      |
| 4.4.0-78.99     | 29.1     | generic, lowlatency      |
| 4.4.0-79.100    | 29.1     | generic, lowlatency      |
| 4.4.0-81.104    | 29.1     | generic, lowlatency      |
| 4.4.0-83.106    | 29.1     | generic, lowlatency      |
| 4.4.0-87.110    | 29.1     | generic, lowlatency      |
| 4.4.0-89.112    | 29.1     | generic, lowlatency      |
| 4.4.0-91.114    | 29.1     | generic, lowlatency      |
| lts-4.4.0-21.37_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-22.39_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-24.43_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-28.47_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-31.50_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-34.53_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-36.55_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-38.57_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-42.62_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-45.66_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-47.68_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-51.72_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-53.74_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-57.78_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-59.80_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-62.83_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-63.84_14.04.2-lts-xenial | 14.04.2  | generic, lowlatency      |
| lts-4.4.0-64.85_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-66.87_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-70.91_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-71.92_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-72.93_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-75.96_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-78.99_14.04.2-lts-xenial | 14.04.2  | generic, lowlatency      |
| lts-4.4.0-79.100_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-81.104_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-87.110_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |

Additionally, you should install an updated kernel with these fixes and
reboot at your convienience.

References

CVE-2015-7837, CVE-2017-7495

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August 30, 2017

Topics%20covered

Topics Covered

security advisory local exploit kernel system patch ubuntu security issues linux

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