Resource exhaustion in Linux kernel - CVE-2020-8992
Published: February 14, 2020 / Updated: April 27, 2022
Vulnerability identifier: #VU92772
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-8992
CWE-ID: CWE-400
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to perform a denial of service (DoS) attack.
ext4_protect_reserved_inode in fs/ext4/block_validity.c in the Linux kernel through 5.5.3 allows attackers to cause a denial of service (soft lockup) via a crafted journal size.
Affected software
Linux kernel
Ubuntu
linux-image-virtual-lts-xenial (Ubuntu package)
linux-image-powerpc64-smp-lts-xenial (Ubuntu package)
linux-image-powerpc64-emb-lts-xenial (Ubuntu package)
linux-image-powerpc-smp-lts-xenial (Ubuntu package)
linux-image-powerpc-e500mc-lts-xenial (Ubuntu package)
linux-image-lowlatency-lts-xenial (Ubuntu package)
linux-image-generic-lts-xenial (Ubuntu package)
linux-image-generic-lpae-lts-xenial (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-powerpc64-smp (Ubuntu package)
linux-image-powerpc64-emb (Ubuntu package)
linux-image-powerpc-smp (Ubuntu package)
linux-image-powerpc-e500mc (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-4.4.0-185-generic-lpae (Ubuntu package)
linux-image-4.4.0-185-lowlatency (Ubuntu package)
linux-image-4.4.0-185-generic (Ubuntu package)
linux-image-4.4.0-185-powerpc64-emb (Ubuntu package)
linux-image-4.4.0-185-powerpc64-smp (Ubuntu package)
linux-image-4.4.0-185-powerpc-smp (Ubuntu package)
linux-image-4.4.0-185-powerpc-e500mc (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-4.4.0-1074-aws (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-4.4.0-1076-kvm (Ubuntu package)
linux-image-4.4.0-1110-aws (Ubuntu package)
linux-image-raspi2 (Ubuntu package)
linux-image-4.4.0-1135-raspi2 (Ubuntu package)
linux-image-snapdragon (Ubuntu package)
linux-image-4.4.0-1139-snapdragon (Ubuntu package)
Ubuntu
linux-image-virtual-lts-xenial (Ubuntu package)
linux-image-powerpc64-smp-lts-xenial (Ubuntu package)
linux-image-powerpc64-emb-lts-xenial (Ubuntu package)
linux-image-powerpc-smp-lts-xenial (Ubuntu package)
linux-image-powerpc-e500mc-lts-xenial (Ubuntu package)
linux-image-lowlatency-lts-xenial (Ubuntu package)
linux-image-generic-lts-xenial (Ubuntu package)
linux-image-generic-lpae-lts-xenial (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-powerpc64-smp (Ubuntu package)
linux-image-powerpc64-emb (Ubuntu package)
linux-image-powerpc-smp (Ubuntu package)
linux-image-powerpc-e500mc (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-4.4.0-185-generic-lpae (Ubuntu package)
linux-image-4.4.0-185-lowlatency (Ubuntu package)
linux-image-4.4.0-185-generic (Ubuntu package)
linux-image-4.4.0-185-powerpc64-emb (Ubuntu package)
linux-image-4.4.0-185-powerpc64-smp (Ubuntu package)
linux-image-4.4.0-185-powerpc-smp (Ubuntu package)
linux-image-4.4.0-185-powerpc-e500mc (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-4.4.0-1074-aws (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-4.4.0-1076-kvm (Ubuntu package)
linux-image-4.4.0-1110-aws (Ubuntu package)
linux-image-raspi2 (Ubuntu package)
linux-image-4.4.0-1135-raspi2 (Ubuntu package)
linux-image-snapdragon (Ubuntu package)
linux-image-4.4.0-1139-snapdragon (Ubuntu package)
How to mitigate CVE-2020-8992
Install update from vendor's repository.
linux-image-virtual-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-powerpc64-smp-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-powerpc64-emb-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-powerpc-smp-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-powerpc-e500mc-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-lowlatency-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-generic-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-generic-lpae-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-generic (Ubuntu package) - update to 4.4.0.185.191
linux-image-virtual (Ubuntu package) - update to 4.4.0.185.191
linux-image-powerpc64-smp (Ubuntu package) - update to 4.4.0.185.191
linux-image-powerpc64-emb (Ubuntu package) - update to 4.4.0.185.191
linux-image-powerpc-smp (Ubuntu package) - update to 4.4.0.185.191
linux-image-powerpc-e500mc (Ubuntu package) - update to 4.4.0.185.191
linux-image-lowlatency (Ubuntu package) - update to 4.4.0.185.191
linux-image-generic-lpae (Ubuntu package) - update to 4.4.0.185.191
linux-image-4.4.0-185-generic-lpae (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-4.4.0-185-lowlatency (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-4.4.0-185-generic (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-4.4.0-185-powerpc64-emb (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-4.4.0-185-powerpc64-smp (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-4.4.0-185-powerpc-smp (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-4.4.0-185-powerpc-e500mc (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-aws (Ubuntu package) - addressed in versions 4.4.0.1074.71, 4.4.0.1110.114
linux-image-4.4.0-1074-aws (Ubuntu package) - update to 4.4.0-1074.78
linux-image-kvm (Ubuntu package) - update to 4.4.0.1076.74
linux-image-4.4.0-1076-kvm (Ubuntu package) - update to 4.4.0-1076.83
linux-image-4.4.0-1110-aws (Ubuntu package) - update to 4.4.0-1110.121
linux-image-raspi2 (Ubuntu package) - update to 4.4.0.1135.135
linux-image-4.4.0-1135-raspi2 (Ubuntu package) - update to 4.4.0-1135.144
linux-image-snapdragon (Ubuntu package) - update to 4.4.0.1139.131
linux-image-4.4.0-1139-snapdragon (Ubuntu package) - update to 4.4.0-1139.147
linux-image-powerpc64-smp-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-powerpc64-emb-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-powerpc-smp-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-powerpc-e500mc-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-lowlatency-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-generic-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-generic-lpae-lts-xenial (Ubuntu package) - update to 4.4.0.185.162
linux-image-generic (Ubuntu package) - update to 4.4.0.185.191
linux-image-virtual (Ubuntu package) - update to 4.4.0.185.191
linux-image-powerpc64-smp (Ubuntu package) - update to 4.4.0.185.191
linux-image-powerpc64-emb (Ubuntu package) - update to 4.4.0.185.191
linux-image-powerpc-smp (Ubuntu package) - update to 4.4.0.185.191
linux-image-powerpc-e500mc (Ubuntu package) - update to 4.4.0.185.191
linux-image-lowlatency (Ubuntu package) - update to 4.4.0.185.191
linux-image-generic-lpae (Ubuntu package) - update to 4.4.0.185.191
linux-image-4.4.0-185-generic-lpae (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-4.4.0-185-lowlatency (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-4.4.0-185-generic (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-4.4.0-185-powerpc64-emb (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-4.4.0-185-powerpc64-smp (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-4.4.0-185-powerpc-smp (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-4.4.0-185-powerpc-e500mc (Ubuntu package) - addressed in versions 4.4.0-185.215, 4.4.0-185.215~14.04.1
linux-image-aws (Ubuntu package) - addressed in versions 4.4.0.1074.71, 4.4.0.1110.114
linux-image-4.4.0-1074-aws (Ubuntu package) - update to 4.4.0-1074.78
linux-image-kvm (Ubuntu package) - update to 4.4.0.1076.74
linux-image-4.4.0-1076-kvm (Ubuntu package) - update to 4.4.0-1076.83
linux-image-4.4.0-1110-aws (Ubuntu package) - update to 4.4.0-1110.121
linux-image-raspi2 (Ubuntu package) - update to 4.4.0.1135.135
linux-image-4.4.0-1135-raspi2 (Ubuntu package) - update to 4.4.0-1135.144
linux-image-snapdragon (Ubuntu package) - update to 4.4.0.1139.131
linux-image-4.4.0-1139-snapdragon (Ubuntu package) - update to 4.4.0-1139.147
External References
- https://patchwork.ozlabs.org/patch/1236118/
- https://security.netapp.com/advisory/ntap-20200313-0003/
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html
- https://usn.ubuntu.com/4318-1/
- https://usn.ubuntu.com/4324-1/
- https://usn.ubuntu.com/4344-1/
- https://usn.ubuntu.com/4342-1/
- https://usn.ubuntu.com/4419-1/