Description

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.

References

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=853eab68afc80f59f36bbdeb715e5c88c501e680

https://www.openwall.com/lists/oss-security/2020/06/18/1

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10781

https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html

Details

Risk Information

CVSS v2

CVSS v3