In the Linux kernel before 5.17.3, fs/io_uring.c has a use-after-free due to a race condition in io_uring timeouts. This can be triggered by a local user who has no access to any user namespace; however, the race condition perhaps can only be exploited infrequently.
https://www.openwall.com/lists/oss-security/2022/04/22/3
https://github.com/torvalds/linux/commit/e677edbcabee849bfdd43f1602bccbecf736a646
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.17.3
http://www.openwall.com/lists/oss-security/2022/04/22/4
https://www.debian.org/security/2022/dsa-5127
http://www.openwall.com/lists/oss-security/2022/08/08/3
https://ruia-ruia.github.io/2022/08/05/CVE-2022-29582-io-uring/
Source: MITRE
Published: 2022-04-22
Updated: 2022-10-26
Type: CWE-416
Base Score: 6.9
Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C
Impact Score: 10
Exploitability Score: 3.4
Severity: MEDIUM
Base Score: 7
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 1
Severity: HIGH