Summary
It was discovered that debugfs in the Linux kernel as used by blktrace
contained a use-after-free in some situations. A privileged local attacker
could possibly use this to cause a denial of service (system crash).
(CVE-2019-19770)
It was discovered that a race condition existed in the binder IPC
implementation in the Linux kernel, leading to a use-after-free
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2020-0423)
Daniele Antonioli, Nils Ole Tippenhauer, and Kasper Rasmussen discovered
that legacy pairing and secure-connections pairing authentication in the
Bluetooth protocol could allow an unauthenticated user to complete
authentication without pairing credentials via adjacent access. A
physically proximate attacker could use this to impersonate a previously
paired Bluetooth device. (CVE-2020-10135)
It was discovered that the console keyboard driver in the Linux kernel
contained a race condition. A local attacker could use this to expose
sensitive information (kernel memory). (CVE-2020-25656)
Minh Yuan discovered that the tty driver in the Linux kernel contained race
conditions when handling fonts. A local attacker could possibly use this to
expose sensitive information (kernel memory). (CVE-2020-25668)
Keyu Man discovered that the ICMP global rate limiter in the Linux kernel
could be used to assist in scanning open UDP ports. A remote attacker could
use to facilitate attacks on UDP based services that depend on source port
randomization. (CVE-2020-25705)
Jinoh Kang discovered that the Xen event channel infrastructure in the
Linux kernel contained a race condition. An attacker in guest could
possibly use this to cause a denial of service (dom0 crash).
(CVE-2020-27675)
Daniel Axtens discovered that PowerPC RTAS implementation in the Linux
kernel did not properly restrict memory accesses in some situations. A
privileged local attacker could use this to arbitrarily modify kernel
memory, potentially bypassing kernel lockdown restrictions.
(CVE-2020-27777)
Minh Yuan discovered that the framebuffer console driver in the Linux
kernel did not properly handle fonts in some conditions. A local attacker
could use this to cause a denial of service (system crash) or possibly
expose sensitive information (kernel memory). (CVE-2020-28974)
Fixed packages 15
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 16.04 LTS 16.04:LTS | linux-aws-hwe | 4.15.0-1091.96~16.04.1 |
| Ubuntu · 16.04 LTS 16.04:LTS | linux-azure | 4.15.0-1103.114~16.04.1 |
| Ubuntu · 16.04 LTS 16.04:LTS | linux-gcp | 4.15.0-1091.104~16.04.1 |
| Ubuntu · 16.04 LTS 16.04:LTS | linux-hwe | 4.15.0-129.132~16.04.1 |
| Ubuntu · 16.04 LTS 16.04:LTS | linux-oracle | 4.15.0-1062.68~16.04.1 |
| Ubuntu · 18.04 LTS 18.04:LTS | linux | 4.15.0-129.132 |
| Ubuntu · 18.04 LTS 18.04:LTS | linux-aws | 4.15.0-1091.96 |
| Ubuntu · 18.04 LTS 18.04:LTS | linux-azure-4.15 | 4.15.0-1103.114 |
| Ubuntu · 18.04 LTS 18.04:LTS | linux-gcp-4.15 | 4.15.0-1091.104 |
| Ubuntu · 18.04 LTS 18.04:LTS | linux-gke-4.15 | 4.15.0-1077.82 |
| Ubuntu · 18.04 LTS 18.04:LTS | linux-kvm | 4.15.0-1082.84 |
| Ubuntu · 18.04 LTS 18.04:LTS | linux-oracle | 4.15.0-1062.68 |
| Ubuntu · 18.04 LTS 18.04:LTS | linux-raspi2 | 4.15.0-1077.82 |
| Ubuntu · 18.04 LTS 18.04:LTS | linux-snapdragon | 4.15.0-1094.103 |
| Ubuntu · Pro 14.04 LTS Pro:14.04:LTS | linux-azure | 4.15.0-1103.114~14.04.1 |
Vulnerabilities 9
-
Medium 5.4CVE-2020-10135 Public exploit
Bluetooth devices supporting BR/EDR v5.2 and earlier are vulnerable to impersonation attacks
Legacy pairing and secure-connections pairing authentication in Bluetooth BR/EDR Core Specification v5.2 and earlier may allow an unauthenticated user to complete authentication without pairing credentials via adjacent access. An unauthenticated, adjacent att…
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Unscored —
In the Linux kernel 4.19.83, there is a use-after-free (read) in the debugfs_remove function in fs/debugfs/inode.c (whi…
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Unscored —CVE-2020-0423 Public exploit
In binder_release_work of binder.c, there is a possible use-after-free due to improper locking. This could lead to loca…
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Unscored —
A flaw was found in the Linux kernel. A use-after-free was found in the way the console subsystem was using ioctls KDGK…
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Unscored —
A flaw was found in Linux Kernel because access to the global variable fg_console is not properly synchronized leading …
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Unscored —CVE-2020-25705 Public exploit
A flaw in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP ports. This flaw allows an of…
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Unscored —
An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. drivers/xen/events/events_b…
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Unscored —
A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication. On a locked down (usuall…
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Unscored —
A slab-out-of-bounds read in fbcon in the Linux kernel before 5.9.7 could be used by local attackers to read privileged…
References
-
report
https://ubuntu.com/security/CVE-2019-19770
-
report
https://ubuntu.com/security/CVE-2020-0423
-
report
https://ubuntu.com/security/CVE-2020-10135
-
report
https://ubuntu.com/security/CVE-2020-25656
-
report
https://ubuntu.com/security/CVE-2020-25668
-
report
https://ubuntu.com/security/CVE-2020-25705
-
report
https://ubuntu.com/security/CVE-2020-27675
-
report
https://ubuntu.com/security/CVE-2020-27777
-
report
https://ubuntu.com/security/CVE-2020-28974