CVE-2022-1055 Use after Free in tc_new_tfilter allowing for privilege escalation in Linux Kernel

What is CVE-2022-1055?

CVE-2022-1055 is a high-severity use after free vulnerability in Canonical Ubuntu Linux, published on 29 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A use-after-free exists in the Linux Kernel in tc_new_tfilter that could allow a local attacker to gain privilege escalation. The exploit requires unprivileged user namespaces. We recommend upgrading past commit 04c2a47ffb13c29778e2a14e414ad4cb5a5db4b5

Weakness: CWE-416

Which versions are affected by CVE-2022-1055?

It affects 12 products.

Products include Canonical Ubuntu Linux, Fedoraproject Fedora, Linux kernel, Netapp H300e Firmware, Netapp H300s Firmware, Netapp H410c Firmware and 6 more.

How do I fix CVE-2022-1055?

Apply the vendor's patch.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2022-1055 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-1055 exists.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as A-228390920, AZL-9218, DEBIAN-CVE-2022-1055, GHSA-wmc5-hv62-89g7, PUB-A-228390920, UBUNTU-CVE-2022-1055.