A flaw was found in the Linux Kernel before 5.8-rc6 in the ZRAM kernel module, where a user with a local account and the ability to read the /sys/class/zram-control/hot_add file can create ZRAM device nodes in the /dev/ directory. This read allocates kernel memory and is not accounted for a user that triggers the creation of that ZRAM device. With this vulnerability, continually reading the device may consume a large amount of system memory and cause the Out-of-Memory (OOM) killer to activate and terminate random userspace processes, possibly making the system inoperable.
The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.
| Link | Tags |
|---|---|
| https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=853eab68afc80f59f36bbdeb715e5c88c501e680 | patch vendor advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10781 | issue tracking third party advisory |
| https://www.openwall.com/lists/oss-security/2020/06/18/1 | mailing list third party advisory patch |
| https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html | third party advisory mailing list |