Ubuntu: (CVE-2022-48988): linux vulnerability
Description
In the Linux kernel, the following vulnerability has been resolved: memcg: fix possible use-after-free in memcg_write_event_control() memcg_write_event_control() accesses the dentry->d_name of the specified control fd to route the write call. As a cgroup interface file can't be renamed, it's safe to access d_name as long as the specified file is a regular cgroup file. Also, as these cgroup interface files can't be removed before the directory, it's safe to access the parent too. Prior to 347c4a874710 ("memcg: remove cgroup_event->cft"), there was a call to __file_cft() which verified that the specified file is a regular cgroupfs file before further accesses. The cftype pointer returned from __file_cft() was no longer necessary and the commit inadvertently dropped the file type check with it allowing any file to slip through. With the invarients broken, the d_name and parent accesses can now race against renames and removals of arbitrary files and cause use-after-free's. Fix the bug by resurrecting the file type check in __file_cft(). Now that cgroupfs is implemented through kernfs, checking the file operations needs to go through a layer of indirection. Instead, let's check the superblock and dentry type.
Solution(s)
- ubuntu-upgrade-linux
- ubuntu-upgrade-linux-aws
- ubuntu-upgrade-linux-aws-5-15
- ubuntu-upgrade-linux-aws-5-4
- ubuntu-upgrade-linux-aws-hwe
- ubuntu-upgrade-linux-azure
- ubuntu-upgrade-linux-azure-4-15
- ubuntu-upgrade-linux-azure-5-15
- ubuntu-upgrade-linux-azure-5-4
- ubuntu-upgrade-linux-azure-fde
- ubuntu-upgrade-linux-azure-fde-5-15
- ubuntu-upgrade-linux-bluefield
- ubuntu-upgrade-linux-gcp
- ubuntu-upgrade-linux-gcp-4-15
- ubuntu-upgrade-linux-gcp-5-15
- ubuntu-upgrade-linux-gcp-5-4
- ubuntu-upgrade-linux-gke
- ubuntu-upgrade-linux-gkeop
- ubuntu-upgrade-linux-gkeop-5-15
- ubuntu-upgrade-linux-hwe
- ubuntu-upgrade-linux-hwe-5-15
- ubuntu-upgrade-linux-hwe-5-4
- ubuntu-upgrade-linux-ibm
- ubuntu-upgrade-linux-ibm-5-4
- ubuntu-upgrade-linux-intel-iotg
- ubuntu-upgrade-linux-intel-iotg-5-15
- ubuntu-upgrade-linux-iot
- ubuntu-upgrade-linux-kvm
- ubuntu-upgrade-linux-lowlatency
- ubuntu-upgrade-linux-lowlatency-hwe-5-15
- ubuntu-upgrade-linux-nvidia
- ubuntu-upgrade-linux-oracle
- ubuntu-upgrade-linux-oracle-5-15
- ubuntu-upgrade-linux-oracle-5-4
- ubuntu-upgrade-linux-raspi
- ubuntu-upgrade-linux-raspi-5-4
- ubuntu-upgrade-linux-riscv-5-15
- ubuntu-upgrade-linux-xilinx-zynqmp
- Lightweight Endpoint Agent
- Live Dashboards
- Real Risk Prioritization
- IT-Integrated Remediation Projects
- Cloud, Virtual, and Container Assessment
- Integrated Threat Feeds
- Easy-to-Use RESTful API
- Automation-Assisted Patching
- Automated Containment
With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.
– Scott Cheney, Manager of Information Security, Sierra View Medical Center