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Kernel Live Patch Security Notice LSN-0063-1

Kernel Live Patch Security Notice LSN-0063-1
Posted Feb 20, 2020
Authored by Benjamin M. Romer

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. 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. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux
advisories | CVE-2019-14615, CVE-2019-19050, CVE-2019-20096, CVE-2019-5108, CVE-2020-7053
SHA-256 | 3c905722a86d530e482e9a6b3bcee6079ea4d1a13dff3d803fadfd5fb541bc01

Kernel Live Patch Security Notice LSN-0063-1

Change Mirror Download
==========================================================================
Kernel Live Patch Security Notice 0063-1
February 19, 2020

linux vulnerability
==========================================================================

A security issue affects these releases of Ubuntu:

| Series | Base kernel | Arch | flavors |
|------------------+--------------+----------+------------------|
| Ubuntu 18.04 LTS | 4.15.0 | amd64 | aws |
| Ubuntu 18.04 LTS | 4.15.0 | amd64 | generic |
| Ubuntu 18.04 LTS | 4.15.0 | amd64 | lowlatency |
| Ubuntu 18.04 LTS | 4.15.0 | amd64 | oem |
| Ubuntu 18.04 LTS | 5.0.0 | amd64 | azure |
| Ubuntu 18.04 LTS | 5.0.0 | amd64 | gcp |
| Ubuntu 14.04 LTS | 4.4.0 | amd64 | generic |
| Ubuntu 14.04 LTS | 4.4.0 | amd64 | lowlatency |
| Ubuntu 16.04 LTS | 4.4.0 | amd64 | aws |
| Ubuntu 16.04 LTS | 4.4.0 | amd64 | generic |
| Ubuntu 16.04 LTS | 4.4.0 | amd64 | lowlatency |
| Ubuntu 16.04 LTS | 4.15.0 | amd64 | azure |
| Ubuntu 16.04 LTS | 4.15.0 | amd64 | generic |
| Ubuntu 16.04 LTS | 4.15.0 | amd64 | lowlatency |

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
certain error conditions. An attacker could possibly use this to cause a
denial of service (kernel memory exhaustion). (CVE-2019-20096)

It was discovered that a race condition can lead to a use-after-free while
destroying GEM contexts in the i915 driver for the Linux kernel. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2020-7053)

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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