CVE-2022-4283: debian debian_linux Use After Free

Vulnerability summary

CVE-2022-4283 is a high (CVSS 7.8) Use After Free vulnerability in debian debian_linux. EPSS estimates a 1.08% chance of exploitation in the next 30 days, higher than 64.6% of scored vulnerabilities.

Timeline

1. 14-12-2022
   PublishedVulnerability first disclosed.
2. 14-04-2025
   Last modifiedVulnerability information updated.

Description

A vulnerability was found in X.Org. This security flaw occurs because the XkbCopyNames function left a dangling pointer to freed memory, resulting in out-of-bounds memory access on subsequent XkbGetKbdByName requests.. This issue can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions.

• CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.