Summary
It was discovered that the network block device (nbd) implementation in the
Linux kernel did not properly check for error conditions in some
situations. An attacker could possibly use this to cause a denial of
service (system crash). (CVE-2019-16089)
It was discovered that the kernel->user space relay implementation in the
Linux kernel did not properly check return values in some situations. A
local attacker could possibly use this to cause a denial of service (system
crash). (CVE-2019-19462)
Mauricio Faria de Oliveira discovered that the aufs implementation in the
Linux kernel improperly managed inode reference counts in the
vfsub_dentry_open() method. A local attacker could use this vulnerability
to cause a denial of service. (CVE-2020-11935)
Jason A. Donenfeld discovered that the ACPI implementation in the Linux
kernel did not properly restrict loading ACPI tables via configfs. A
privileged attacker could use this to bypass Secure Boot lockdown
restrictions and execute arbitrary code in the kernel. (CVE-2020-15780)
Fixed packages 11
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 18.04 LTS 18.04:LTS | linux-azure-5.4 | 5.4.0-1022.22~18.04.1 |
| Ubuntu · 18.04 LTS 18.04:LTS | linux-hwe-5.4 | 5.4.0-42.46~18.04.1 |
| Ubuntu · 18.04 LTS 18.04:LTS | linux-raspi-5.4 | 5.4.0-1015.15~18.04.1 |
| Ubuntu · 20.04 LTS 20.04:LTS | linux | 5.4.0-42.46 |
| Ubuntu · 20.04 LTS 20.04:LTS | linux-aws | 5.4.0-1020.20 |
| Ubuntu · 20.04 LTS 20.04:LTS | linux-azure | 5.4.0-1022.22 |
| Ubuntu · 20.04 LTS 20.04:LTS | linux-gcp | 5.4.0-1021.21 |
| Ubuntu · 20.04 LTS 20.04:LTS | linux-kvm | 5.4.0-1020.20 |
| Ubuntu · 20.04 LTS 20.04:LTS | linux-oracle | 5.4.0-1021.21 |
| Ubuntu · 20.04 LTS 20.04:LTS | linux-raspi | 5.4.0-1015.15 |
| Ubuntu · 20.04 LTS 20.04:LTS | linux-riscv | 5.4.0-30.34 |
Vulnerabilities 4
-
Medium 4.4
aufs: improperly managed inode reference counts in the vfsub_dentry_open() method
It was discovered that aufs improperly managed inode reference counts in the vfsub_dentry_open() method. A local attacker could use this vulnerability to cause a denial of service attack.
-
Unscored —
An issue was discovered in the Linux kernel through 5.2.13. nbd_genl_status in drivers/block/nbd.c does not check the n…
-
Unscored —
relay_open in kernel/relay.c in the Linux kernel through 5.4.1 allows local users to cause a denial of service (such as…
-
Unscored —CVE-2020-15780 Public exploit
An issue was discovered in drivers/acpi/acpi_configfs.c in the Linux kernel before 5.7.7. Injection of malicious ACPI t…