CVE-2020-15436
Publication date 23 November 2020
Last updated 24 July 2024
Ubuntu priority
Cvss 3 Severity Score
Use-after-free vulnerability in fs/block_dev.c in the Linux kernel before 5.8 allows local users to gain privileges or cause a denial of service by leveraging improper access to a certain error field.
From the Ubuntu Security Team
It was discovered that the block layer implementation in the Linux kernel did not properly perform reference counting in some situations, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash).
Status
Package | Ubuntu Release | Status |
---|---|---|
linux | ||
20.04 LTS focal |
Fixed 5.4.0-45.49
|
|
18.04 LTS bionic |
Fixed 4.15.0-115.116
|
|
16.04 LTS xenial |
Fixed 4.4.0-187.217
|
|
14.04 LTS trusty | Ignored | |
linux-aws | ||
20.04 LTS focal |
Fixed 5.4.0-1022.22
|
|
18.04 LTS bionic |
Fixed 4.15.0-1080.84
|
|
16.04 LTS xenial |
Fixed 4.4.0-1112.124
|
|
14.04 LTS trusty | Ignored | |
linux-aws-5.0 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic | Ignored | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-aws-5.3 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic | Ignored | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-aws-5.4 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Fixed 5.4.0-1022.22~18.04.1
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-aws-hwe | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic | Not in release | |
16.04 LTS xenial |
Fixed 4.15.0-1080.84~16.04.1
|
|
14.04 LTS trusty | Not in release | |
linux-azure | ||
20.04 LTS focal |
Fixed 5.4.0-1023.23
|
|
18.04 LTS bionic | Ignored | |
16.04 LTS xenial |
Fixed 4.15.0-1093.103~16.04.1
|
|
14.04 LTS trusty | Ignored | |
linux-azure-4.15 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Fixed 4.15.0-1093.103
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-azure-5.3 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic | Ignored | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-azure-5.4 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Fixed 5.4.0-1023.23~18.04.1
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-azure-edge | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic | Ignored | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-dell300x | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Not affected
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-gcp | ||
20.04 LTS focal |
Fixed 5.4.0-1022.22
|
|
18.04 LTS bionic | Ignored | |
16.04 LTS xenial |
Fixed 4.15.0-1081.92~16.04.1
|
|
14.04 LTS trusty | Not in release | |
linux-gcp-4.15 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Fixed 4.15.0-1081.92
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-gcp-5.3 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic | Ignored | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-gcp-5.4 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Fixed 5.4.0-1022.22~18.04.1
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-gcp-edge | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic | Ignored | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-gke-4.15 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Fixed 4.15.0-1067.70
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-gke-5.0 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Fixed 5.0.0-1046.47
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-gke-5.3 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Fixed 5.3.0-1033.35
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-gke-5.4 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Not affected
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-gkeop | ||
20.04 LTS focal |
Not affected
|
|
18.04 LTS bionic | Not in release | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-gkeop-5.4 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Not affected
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-hwe | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic | Ignored | |
16.04 LTS xenial |
Fixed 4.15.0-115.116~16.04.1
|
|
14.04 LTS trusty | Not in release | |
linux-hwe-5.4 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Fixed 5.4.0-45.49~18.04.2
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-hwe-5.8 | ||
20.04 LTS focal |
Not affected
|
|
18.04 LTS bionic | Not in release | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-hwe-edge | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic | Ignored | |
16.04 LTS xenial | Ignored | |
14.04 LTS trusty | Not in release | |
linux-kvm | ||
20.04 LTS focal |
Fixed 5.4.0-1021.21
|
|
18.04 LTS bionic |
Fixed 4.15.0-1072.73
|
|
16.04 LTS xenial |
Fixed 4.4.0-1078.85
|
|
14.04 LTS trusty | Not in release | |
linux-lts-trusty | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic | Not in release | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-lts-xenial | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic | Not in release | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Ignored | |
linux-oem | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Fixed 4.15.0-1094.104
|
|
16.04 LTS xenial | Ignored | |
14.04 LTS trusty | Not in release | |
linux-oem-5.10 | ||
20.04 LTS focal |
Not affected
|
|
18.04 LTS bionic | Not in release | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-oem-5.6 | ||
20.04 LTS focal |
Fixed 5.6.0-1048.52
|
|
18.04 LTS bionic | Not in release | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-oem-osp1 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic | Ignored | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-oracle | ||
20.04 LTS focal |
Fixed 5.4.0-1022.22
|
|
18.04 LTS bionic |
Fixed 4.15.0-1051.55
|
|
16.04 LTS xenial |
Fixed 4.15.0-1051.55~16.04.1
|
|
14.04 LTS trusty | Not in release | |
linux-oracle-5.0 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic | Ignored | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-oracle-5.3 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic | Ignored | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-oracle-5.4 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Fixed 5.4.0-1022.22~18.04.1
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-raspi | ||
20.04 LTS focal |
Fixed 5.4.0-1016.17
|
|
18.04 LTS bionic | Not in release | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-raspi-5.4 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Fixed 5.4.0-1016.17~18.04.1
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-raspi2 | ||
20.04 LTS focal | Ignored | |
18.04 LTS bionic |
Fixed 4.15.0-1068.72
|
|
16.04 LTS xenial |
Fixed 4.4.0-1137.146
|
|
14.04 LTS trusty | Not in release | |
linux-raspi2-5.3 | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Fixed 5.3.0-1032.34
|
|
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-riscv | ||
20.04 LTS focal |
Fixed 5.4.0-31.35
|
|
18.04 LTS bionic | Not in release | |
16.04 LTS xenial | Not in release | |
14.04 LTS trusty | Not in release | |
linux-snapdragon | ||
20.04 LTS focal | Not in release | |
18.04 LTS bionic |
Fixed 4.15.0-1084.92
|
|
16.04 LTS xenial |
Fixed 4.4.0-1141.149
|
|
14.04 LTS trusty | Not in release |
Severity score breakdown
Parameter | Value |
---|---|
Base score | 6.7 · Medium |
Attack vector | Local |
Attack complexity | Low |
Privileges required | High |
User interaction | None |
Scope | Unchanged |
Confidentiality | High |
Integrity impact | High |
Availability impact | High |
Vector | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-4752-1
- Linux kernel (OEM) vulnerabilities
- 25 February 2021