Use After Free Affecting kernel-debug package, versions *
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Test your applications- Snyk ID SNYK-RHEL8-KERNELDEBUG-8282989
- published 23 Oct 2024
- disclosed 21 Oct 2024
Introduced: 21 Oct 2024
CVE-2022-48988 Open this link in a new tabHow to fix?
There is no fixed version for RHEL:8 kernel-debug.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug package and not the kernel-debug package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
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.
References
- https://access.redhat.com/security/cve/CVE-2022-48988
- https://git.kernel.org/stable/c/0ed074317b835caa6c03bcfa8f133365324673dc
- https://git.kernel.org/stable/c/35963b31821920908e397146502066f6b032c917
- https://git.kernel.org/stable/c/4a7ba45b1a435e7097ca0f79a847d0949d0eb088
- https://git.kernel.org/stable/c/aad8bbd17a1d586005feb9226c2e9cfce1432e13
- https://git.kernel.org/stable/c/b77600e26fd48727a95ffd50ba1e937efb548125
- https://git.kernel.org/stable/c/e1ae97624ecf400ea56c238bff23e5cd139df0b8
- https://git.kernel.org/stable/c/f1f7f36cf682fa59db15e2089039a2eeb58ff2ad