Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 5.8.0 |
| Debian | Debian Linux | 9.0 |
Related Weaknesses (CWE)
References
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10781Issue TrackingThird Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=85PatchVendor Advisory
- https://lists.debian.org/debian-lts-announce/2020/09/msg00025.htmlMailing ListThird Party Advisory
- https://www.openwall.com/lists/oss-security/2020/06/18/1Mailing ListPatchThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10781Issue TrackingThird Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=85PatchVendor Advisory
- https://lists.debian.org/debian-lts-announce/2020/09/msg00025.htmlMailing ListThird Party Advisory
- https://www.openwall.com/lists/oss-security/2020/06/18/1Mailing ListPatchThird Party Advisory
FAQ
What is CVE-2020-10781?
CVE-2020-10781 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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...
How severe is CVE-2020-10781?
CVE-2020-10781 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-10781?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Debian Debian Linux.