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Ubuntu 0063-1 Critical Advisory: Kernel DoS Risks and Fixes

ubuntu
Calendar Grey February 19, 2020
Dist Ubuntu Esm H88
Investigate the Ubuntu 0063-1 notice which outlines essential kernel patches addressing serious security vulnerabilities affecting multiple versions.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

Mitchell Frank discovered that the Wi-Fi implementation in the Linux kernel

when used as an access point would send IAPP location updates for stations

before client authentication had completed. A physically proximate attacker

could use this to cause a denial of service. (CVE-2019-5108)

It was discovered that the Linux kernel did not properly clear data

structures on context switches for certain Intel graphics processors. A

local attacker could use this to expose sensitive information.

(CVE-2019-14615)

It was discovered that the crypto subsystem in the Linux kernel did not

properly deallocate memory in certain error conditions. A local attacker

could use this to cause a denial of service (kernel memory exhaustion).

(CVE-2019-19050)

It was discovered that the Datagram Congestion Control Protocol (DCCP)

implementation in the Linux kernel did not properly deallocate memory in

...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory DoS Ubuntu kernel access point data disclosure

Update Instructions

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

| Kernel                   | Version  | flavors                  |
|--------------------------+----------+--------------------------|
| 4.4.0-168.197            | 63.1     | generic, lowlatency      |
| 4.4.0-168.197~14.04.1    | 63.1     | lowlatency, generic      |
| 4.4.0-169.198            | 63.1     | generic, lowlatency      |
| 4.4.0-169.198~14.04.1    | 63.1     | lowlatency, generic      |
| 4.4.0-170.199            | 63.1     | lowlatency, generic      |
| 4.4.0-170.199~14.04.1    | 63.1     | lowlatency, generic      |
| 4.4.0-171.200            | 63.1     | lowlatency, generic      |
| 4.4.0-171.200~14.04.1    | 63.1     | generic, lowlatency      |
| 4.4.0-173.203            | 63.1     | generic, lowlatency      |
| 4.4.0-1098.109           | 63.1     | aws                      |
| 4.4.0-1099.110           | 63.1     | aws                      |
| 4.4.0-1100.111           | 63.1     | aws                      |
| 4.4.0-1101.112           | 63.1     | aws                      |
| 4.15.0-69.78             | 63.1     | generic, lowlatency      |
| 4.15.0-69.78~16.04.1     | 63.1     | lowlatency, generic      |
| 4.15.0-70.79             | 63.1     | lowlatency, generic      |
| 4.15.0-70.79~16.04.1     | 63.1     | generic, lowlatency      |
| 4.15.0-72.81             | 63.1     | generic, lowlatency      |
| 4.15.0-72.81~16.04.1     | 63.1     | generic, lowlatency      |
| 4.15.0-74.83~16.04.1     | 63.1     | lowlatency, generic      |
| 4.15.0-74.84             | 63.1     | generic, lowlatency      |
| 4.15.0-76.86             | 63.1     | generic, lowlatency      |
| 4.15.0-76.86~16.04.1     | 63.1     | lowlatency, generic      |
| 4.15.0-1054.56           | 63.1     | aws                      |
| 4.15.0-1056.58           | 63.1     | aws                      |
| 4.15.0-1057.59           | 63.1     | aws                      |
| 4.15.0-1058.60           | 63.1     | aws                      |
| 4.15.0-1063.68           | 63.1     | azure                    |
| 4.15.0-1063.72           | 63.1     | oem                      |
| 4.15.0-1064.69           | 63.1     | azure                    |
| 4.15.0-1064.73           | 63.1     | oem                      |
| 4.15.0-1065.75           | 63.1     | oem                      |
| 4.15.0-1066.71           | 63.1     | azure                    |
| 4.15.0-1066.76           | 63.1     | oem                      |
| 4.15.0-1067.72           | 63.1     | azure                    |
| 4.15.0-1067.77           | 63.1     | oem                      |
| 5.0.0-1025.26~18.04.1    | 63.1     | gcp                      |
| 5.0.0-1025.27~18.04.1    | 63.1     | azure                    |
| 5.0.0-1026.27~18.04.1    | 63.1     | gcp                      |
| 5.0.0-1027.29~18.04.1    | 63.1     | azure                    |
| 5.0.0-1028.29~18.04.1    | 63.1     | gcp                      |
| 5.0.0-1028.30~18.04.1    | 63.1     | azure                    |
| 5.0.0-1029.30~18.04.1    | 63.1     | gcp                      |
| 5.0.0-1029.31~18.04.1    | 63.1     | azure                    |

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 | 4.15.0-1054      | aws                      |
| Ubuntu 16.04 LTS | 4.4.0-1098       | aws                      |
| Ubuntu 18.04 LTS | 5.0.0-1025       | azure                    |
| Ubuntu 16.04 LTS | 4.15.0-1063      | azure                    |
| Ubuntu 18.04 LTS | 4.15.0-69        | generic lowlatency       |
| Ubuntu 18.04 LTS | 5.0.0-1025       | gcp                      |
| Ubuntu 16.04 LTS | 4.15.0-69        | generic lowlatency       |
| Ubuntu 14.04 LTS | 4.4.0-168        | generic lowlatency       |
| Ubuntu 18.04 LTS | 4.15.0-1063      | oem                      |
| Ubuntu 16.04 LTS | 4.4.0-168        | generic lowlatency       |

References

CVE-2019-5108, CVE-2019-14615, CVE-2019-19050, CVE-2019-20096,

CVE-2020-7053

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February 19, 2020

Topics%20covered

Topics Covered

security advisory DoS Ubuntu kernel access point data disclosure

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