CVE-2023-21400

Severity: medium (CVSS 6.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-07-13 · updated 2026-06-17
Weakness: CWE-667

Description

In multiple functions of io_uring.c, there is a possible kernel memory corruption due to improper locking. This could lead to local escalation of privilege in the kernel with System execution privileges needed. User interaction is not needed for exploitation.

Affected products

Debian Linux: 10.0, 11.0
Android: all versions

References

http://packetstormsecurity.com/files/175072/Kernel-Live-Patch-Security-Notice-LSN-0098-1.html
http://www.openwall.com/lists/oss-security/2023/07/14/2
http://www.openwall.com/lists/oss-security/2023/07/19/2
http://www.openwall.com/lists/oss-security/2023/07/19/7
http://www.openwall.com/lists/oss-security/2023/07/25/7
https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
https://security.netapp.com/advisory/ntap-20240119-0012/
https://source.android.com/security/bulletin/pixel/2023-07-01
https://www.debian.org/security/2023/dsa-5480
http://packetstormsecurity.com/files/175072/Kernel-Live-Patch-Security-Notice-LSN-0098-1.html
http://www.openwall.com/lists/oss-security/2023/07/14/2
http://www.openwall.com/lists/oss-security/2023/07/19/2

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