SB2022081114 - Ubuntu update for linux

Description

This security bulletin contains information about 5 secuirty vulnerabilities.

1) Resource management error (CVE-ID: CVE-2022-2585)

The vulnerability allows a local user to perform a denial of service (DoS) attack or escalate privileges on the system.

The vulnerability exists due to improper management of internal resources in POSIX CPU timers when handling death of a process. A local user can crash the kernel or execute arbitrary code.

2) Use-after-free (CVE-ID: CVE-2022-2586)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the the netfilter subsystem implementation in Linux kernel when preventing one nft object from referencing an nft set in another nft table. A local user can trigger a use-after-free error and execute arbitrary code on the system with elevated privileges.

3) Double Free (CVE-ID: CVE-2022-2588)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a double free error within the network packet scheduler implementation in the route4_change() function in Linux kernel when removing all references to a route filter before freeing it. A local user can run a specially crafted program to crash the kernel or execute arbitrary code.

4) Processor optimization removal or modification of security-critical code (CVE-ID: CVE-2022-29900)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a mistrained branch predictions for return instructions. A local user can execute arbitrary speculative code under certain microarchitecture-dependent conditions. The vulnerability was dubbed  RETbleed.

5) Processor optimization removal or modification of security-critical code (CVE-ID: CVE-2022-29901)

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to the way non-transparent sharing of branch predictor targets between contexts. A local user can exploit the vulnerability to gain access to sensitive information.

Remediation

Install update from vendor's website.

References

• https://ubuntu.com/security/notices/USN-5565-1