Redhat.comRH:CVE-2023-52463CVE-2023-52463
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6 Medium
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
5.1%
A flaw was found in the Linux kernel, which involves the improper handling of the efivarfs filesystem when the firmware does not support the SetVariable function at runtime. Specifically, even if efivarfs is initially mounted as read-only (RO), it can be remounted as read-write (RW) without checking if the firmware can handle variable updates. This issue allows operations such as efi-updatevar to be executed, which leads to a crash due to a NULL pointer dereference. This crash occurs because the callback for SetVariable is not assigned, causing a level 0 translation fault.
Mitigation
No mitigation is currently available for this vulnerability. Make sure to perform the updates as they become available.
Related
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6 Medium
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
5.1%