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Ubuntu 18.04 LTS: 0055-1 Critical: Kernel Denial Of Service Issues

ubuntu
Calendar Grey September 6, 2019
Dist Ubuntu Esm H88
Essential patches for Ubuntu address kernel vulnerabilities that could lead to possible service interruptions and unauthorized code execution.
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 a use-after-free error existed in the block layer

subsystem of the Linux kernel when certain failure conditions occurred. A

local attacker could possibly use this to cause a denial of service (system

crash) or possibly execute arbitrary code. (CVE-2018-20856)

It was discovered that the Bluetooth UART implementation in the Linux

kernel did not properly check for missing tty operations. A local attacker

could use this to cause a denial of service. (CVE-2019-10207)

Jonathan Looney discovered that the TCP retransmission queue implementation

in the Linux kernel could be fragmented when handling certain TCP Selective

Acknowledgment (SACK) sequences. A remote attacker could use this to cause

a denial of service. (CVE-2019-11478)

Jann Horn discovered a use-after-free vulnerability in the Linux kernel

when accessing LDT entries in some situations. A local attac...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu kernel buffer overread Linux kernel issue

Update Instructions

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

| Kernel                   | Version  | flavors                  |
|--------------------------+----------+--------------------------|
| 4.4.0-148.174            | 55.1     | lowlatency, generic      |
| 4.4.0-150.176            | 55.1     | generic, lowlatency      |
| 4.4.0-151.178            | 55.1     | lowlatency, generic      |
| 4.4.0-154.181            | 55.1     | lowlatency, generic      |
| 4.4.0-157.185            | 55.1     | lowlatency               |
| 4.4.0-159.187            | 55.1     | lowlatency, generic      |
| 4.15.0-50.54             | 55.1     | generic, lowlatency      |
| 4.15.0-50.54~16.04.1     | 55.1     | generic, lowlatency      |
| 4.15.0-51.55             | 55.1     | generic, lowlatency      |
| 4.15.0-51.55~16.04.1     | 55.2     | generic, lowlatency      |
| 4.15.0-52.56             | 55.1     | lowlatency, generic      |
| 4.15.0-52.56~16.04.1     | 55.1     | generic, lowlatency      |
| 4.15.0-54.58             | 55.1     | generic, lowlatency      |
| 4.15.0-54.58~16.04.1     | 55.1     | generic, lowlatency      |
| 4.15.0-55.60             | 55.1     | generic, lowlatency      |
| 4.15.0-58.64             | 55.1     | generic, lowlatency      |
| 4.15.0-58.64~16.04.1     | 55.1     | lowlatency, generic      |

Support Information:

Kernels older than the levels listed below do not receive livepatch
updates. Please upgrade your kernel as soon as possible.

| Series           | Version          | Flavors                  |
|------------------+------------------+--------------------------|
| Ubuntu 18.04 LTS | 4.15.0-50        | generic lowlatency       |
| Ubuntu 16.04 LTS | 4.15.0-50        | generic lowlatency       |
| Ubuntu 16.04 LTS | 4.4.0-148        | generic lowlatency       |
| Ubuntu 14.04 LTS | 4.4.0-148        | generic lowlatency       |

References

CVE-2018-20856, CVE-2019-10207, CVE-2019-11478, CVE-2019-13233,

CVE-2019-14283, CVE-2019-14284

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September 06, 2019

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu kernel buffer overread Linux kernel issue

Package Information

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