#VU29957 Improper Privilege Management in Linux kernel - CVE-2020-10757

Vulnerability identifier: #VU29957

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-10757

CWE-ID: CWE-269

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists in the Linux Kernel in versions after 4.5-rc1 in the way mremap handled DAX Huge Pages. This flaw allows a local attacker with access to a DAX enabled storage to escalate their privileges on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 4.5 rc2 - 4.5 rc7

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External links
https://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html
https://bugzilla.redhat.com/show_bug.cgi?id=1842525
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5bfea2d9b17f1034a68147a8b03b9789af5700f9
https://lists.debian.org/debian-lts-announce/2020/06/msg00012.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IEM47BXZJLODRH5YNNZSAQ2NVM63MYMC/
https://security.netapp.com/advisory/ntap-20200702-0004/
https://www.debian.org/security/2020/dsa-4698
https://www.debian.org/security/2020/dsa-4699
https://www.openwall.com/lists/oss-security/2020/06/04/4

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.