An issue was discovered in the Linux kernel before 5.0.4. There is a use-after-free upon attempted read access to /proc/ioports after the ipmi_si module is removed, related to drivers/char/ipmi/ipmi_si_intf.c, drivers/char/ipmi/ipmi_si_mem_io.c, and drivers/char/ipmi/ipmi_si_port_io.c.
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00071.html
http://www.securityfocus.com/bid/108410
https://access.redhat.com/errata/RHSA-2019:1873
https://access.redhat.com/errata/RHSA-2019:1891
https://access.redhat.com/errata/RHSA-2019:1959
https://access.redhat.com/errata/RHSA-2019:1971
https://access.redhat.com/errata/RHSA-2019:4057
https://access.redhat.com/errata/RHSA-2019:4058
https://access.redhat.com/errata/RHSA-2020:0036
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.4
https://github.com/torvalds/linux/commit/401e7e88d4ef80188ffa07095ac00456f901b8c4
Source: MITRE
Published: 2019-05-07
Updated: 2020-05-06
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