SB2022030929 - Ubuntu update for linux
Published: March 9, 2022 Updated: June 7, 2024
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Information disclosure (CVE-ID: CVE-2022-0001)
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to non-transparent sharing of branch predictor selectors between contexts. A local user can gain unauthorized access to sensitive information on the system.
2) Information disclosure (CVE-ID: CVE-2022-0002)
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to non-transparent sharing of branch predictor within a context. A local user can gain unauthorized access to sensitive information on the system.
3) Use of uninitialized resource (CVE-ID: CVE-2022-0847)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to usage of an uninitialized resources. A local user can overwrite arbitrary file in the page cache, even if the file is read-only, and execute arbitrary code on the system with elevated privileges.
The vulnerability was dubbed Dirty Pipe.
4) Processor optimization removal or modification of security-critical code (CVE-ID: CVE-2022-23960)
The vulnerability allows a local user to obtain potentially sensitive information.
The vulnerability exists due to improper restrictions of cache speculation. A local user can leverage the shared branch history in the Branch History Buffer (BHB) to influence mispredicted branches and gain access to sensitive information.
The vulnerability was dubbed Spectre-BHB.
5) Heap-based buffer overflow (CVE-ID: CVE-2022-25636)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in net/netfilter/nf_dup_netdev.c in the Linux kernel, related to nf_tables_offload. A local user can trigger a heap-based buffer overflow and execute arbitrary code with elevated privileges.
Remediation
Install update from vendor's website.