CVE-2020-11565

Severity: medium (CVSS 6.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-04-06 · updated 2026-06-17
Weakness: CWE-787

Description

An issue was discovered in the Linux kernel through 5.6.2. mpol_parse_str in mm/mempolicy.c has a stack-based out-of-bounds write because an empty nodelist is mishandled during mount option parsing, aka CID-aa9f7d5172fa. NOTE: Someone in the security community disagrees that this is a vulnerability because the issue “is a bug in parsing mount options which can only be specified by a privileged user, so triggering the bug does not grant any powers not already held.”

Affected products

Canonical Ubuntu Linux: 14.04, 16.04, 18.04, 20.04
Linux kernel: through 5.6.2

References

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=aa9f7d5172fac9bf1f09e678c35e287a40a7b7dd
https://github.com/torvalds/linux/commit/aa9f7d5172fac9bf1f09e678c35e287a40a7b7dd
https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html
https://lists.debian.org/debian-lts-announce/2020/06/msg00012.html
https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html
https://usn.ubuntu.com/4363-1/
https://usn.ubuntu.com/4364-1/
https://usn.ubuntu.com/4367-1/
https://usn.ubuntu.com/4368-1/
https://usn.ubuntu.com/4369-1/
https://www.debian.org/security/2020/dsa-4667
https://www.debian.org/security/2020/dsa-4698

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