CVE-2020-29534

high

Description

An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request, causing execve() to incorrectly optimize unshare_fd(), aka CID-0f2122045b94.

References

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0f2122045b946241a9e549c2a76cea54fa58a7ff

https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-21900

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.9.3

https://bugs.chromium.org/p/project-zero/issues/detail?id=2089

Details

Source: Mitre, NVD

Published: 2020-12-03

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 7.2

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 7.8

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H