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Ubuntu 18.04 LTS: 0065-1 Moderate: Kernel Denial Of Service Exploits

ubuntu
Calendar Grey April 9, 2020
Dist Ubuntu Esm H88
Multiple vulnerabilities in the Ubuntu operating system kernel have been resolved. It is necessary to perform an update to mitigate possible threats and maintain system integrity.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

Andrew Honig reported a flaw in the way KVM (Kernel-based Virtual Machine)

emulated the IOAPIC. A privileged guest user could exploit this flaw to

read host memory or cause a denial of service (crash the host).

(CVE-2013-1798)

It was discovered that the KVM implementation in the Linux kernel, when

paravirtual TLB flushes are enabled in guests, the hypervisor in some

situations could miss deferred TLB flushes or otherwise mishandle them. An

attacker in a guest VM could use this to expose sensitive information (read

memory from another guest VM). (CVE-2019-3016)

Al Viro discovered that the vfs layer in the Linux kernel contained a use-

after-free vulnerability. A local attacker could use this to cause a denial

of service (system crash) or possibly expose sensitive information (kernel

memory). (CVE-2020-8428)

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu kernel memory exposure guest user exploit

Update Instructions

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

| Kernel                   | Version  | flavors                  |
|--------------------------+----------+--------------------------|
| 4.4.0-168.197            | 65.1     | generic, lowlatency      |
| 4.4.0-168.197~14.04.1    | 65.1     | lowlatency, generic      |
| 4.4.0-169.198            | 65.1     | generic, lowlatency      |
| 4.4.0-169.198~14.04.1    | 65.1     | lowlatency, generic      |
| 4.4.0-170.199            | 65.1     | lowlatency, generic      |
| 4.4.0-170.199~14.04.1    | 65.1     | lowlatency, generic      |
| 4.4.0-171.200            | 65.1     | lowlatency, generic      |
| 4.4.0-171.200~14.04.1    | 65.1     | generic, lowlatency      |
| 4.4.0-173.203            | 65.1     | generic, lowlatency      |
| 4.4.0-173.203~14.04.1    | 65.1     | generic, lowlatency      |
| 4.4.0-174.204            | 65.1     | lowlatency, generic      |
| 4.4.0-174.204~14.04.1    | 65.1     | generic, lowlatency      |
| 4.4.0-176.206            | 65.1     | lowlatency, generic      |
| 4.4.0-1098.109           | 65.1     | aws                      |
| 4.4.0-1099.110           | 65.1     | aws                      |
| 4.4.0-1101.112           | 65.1     | aws                      |
| 4.4.0-1102.113           | 65.1     | aws                      |
| 4.15.0-69.78             | 65.1     | generic, lowlatency      |
| 4.15.0-69.78~16.04.1     | 65.1     | lowlatency, generic      |
| 4.15.0-70.79             | 65.1     | lowlatency, generic      |
| 4.15.0-70.79~16.04.1     | 65.1     | generic, lowlatency      |
| 4.15.0-72.81             | 65.1     | generic, lowlatency      |
| 4.15.0-72.81~16.04.1     | 65.1     | generic, lowlatency      |
| 4.15.0-74.83~16.04.1     | 65.1     | lowlatency, generic      |
| 4.15.0-74.84             | 65.1     | generic, lowlatency      |
| 4.15.0-76.86             | 65.1     | generic, lowlatency      |
| 4.15.0-76.86~16.04.1     | 65.1     | lowlatency, generic      |
| 4.15.0-88.88             | 65.1     | generic, lowlatency      |
| 4.15.0-88.88~16.04.1     | 65.1     | lowlatency, generic      |
| 4.15.0-91.92             | 65.1     | lowlatency, generic      |
| 4.15.0-91.92~16.04.1     | 65.1     | generic, lowlatency      |
| 4.15.0-1054.56           | 65.1     | aws                      |
| 4.15.0-1056.58           | 65.1     | aws                      |
| 4.15.0-1057.59           | 65.1     | aws                      |
| 4.15.0-1058.60           | 65.1     | aws                      |
| 4.15.0-1060.62           | 65.1     | aws                      |
| 4.15.0-1063.67           | 65.1     | aws                      |
| 4.15.0-1063.68           | 65.1     | azure                    |
| 4.15.0-1063.72           | 65.1     | oem                      |
| 4.15.0-1064.69           | 65.1     | azure                    |
| 4.15.0-1064.73           | 65.1     | oem                      |
| 4.15.0-1065.75           | 65.1     | oem                      |
| 4.15.0-1066.71           | 65.1     | azure                    |
| 4.15.0-1066.76           | 65.1     | oem                      |
| 4.15.0-1067.72           | 65.1     | azure                    |
| 4.15.0-1067.77           | 65.1     | oem                      |
| 4.15.0-1069.74           | 65.1     | azure                    |
| 4.15.0-1069.79           | 65.1     | oem                      |
| 4.15.0-1071.76           | 65.1     | azure                    |
| 4.15.0-1073.83           | 65.1     | oem                      |
| 4.15.0-1075.80           | 65.1     | azure                    |
| 4.15.0-1076.86           | 65.1     | oem                      |
| 5.0.0-1025.26~18.04.1    | 65.1     | gcp                      |
| 5.0.0-1025.27~18.04.1    | 65.1     | azure                    |
| 5.0.0-1026.27~18.04.1    | 65.1     | gcp                      |
| 5.0.0-1027.29~18.04.1    | 65.1     | azure                    |
| 5.0.0-1028.29~18.04.1    | 65.1     | gcp                      |
| 5.0.0-1028.30~18.04.1    | 65.1     | azure                    |
| 5.0.0-1029.30~18.04.1    | 65.1     | gcp                      |
| 5.0.0-1029.31~18.04.1    | 65.1     | 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-2013-1798, CVE-2019-3016, CVE-2020-8428

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April 09, 2020

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu kernel memory exposure guest user exploit

Package Information

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