A race condition in perf_event_open() allows local attackers to leak sensitive data from setuid programs. As no relevant locks (in particular the cred_guard_mutex) are held during the ptrace_may_access() call, it is possible for the specified target task to perform an execve() syscall with setuid execution before perf_event_alloc() actually attaches to it, allowing an attacker to bypass the ptrace_may_access() check and the perf_event_exit_task(current) call that is performed in install_exec_creds() during privileged execve() calls. This issue affects kernel versions before 4.8.
NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.
|Base Score:||4.7||Base Metrics:||AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N|
|Access Vector:||Local network||Attack Complexity:||High|
|Privileges Required:||Low||User Interaction:||None|
|Integrity Impact:||None||Availability Impact:||None|
|Oracle Linux version 6 (kernel-uek)||ELSA-2021-9473||2021-10-08|
|Oracle Linux version 7 (kernel)||ELSA-2020-1016||2020-04-06|
|Oracle Linux version 7 (kernel-uek)||ELSA-2021-9473||2021-10-08|
|Oracle VM version 3 (kernel-uek)||OVMSA-2021-0035||2021-10-11|
This page is generated automatically and has not been checked for errors or omissions. For clarification or corrections please contact the Oracle Linux ULN team