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Oracle Linux: (CVE-2023-2235) (Multiple Advisories): kernel security and bug fix update

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Oracle Linux: (CVE-2023-2235) (Multiple Advisories): kernel security and bug fix update

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
05/01/2023
Created
07/26/2023
Added
07/25/2023
Modified
08/10/2023

Description

A use-after-free vulnerability in the Linux Kernel Performance Events system can be exploited to achieve local privilege escalation.

The perf_group_detach function did not check the event's siblings' attach_state before calling add_event_to_groups(), but remove_on_exec made it possible to call list_del_event() on before detaching from their group, making it possible to use a dangling pointer causing a use-after-free vulnerability.

We recommend upgrading past commit fd0815f632c24878e325821943edccc7fde947a2.

Solution(s)

  • oracle-linux-upgrade-kernel

References

  • ELSA-2023-4517
  • CVE-2023-2235

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