PT-2019-5758 · Linux+5 · Linux Kernel+5
Andrea Arcangeli
·
Published
2017-03-17
·
Updated
2023-03-23
·
CVE-2019-9213
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions prior to 4.20.14
Description
The issue is related to the expand downwards function in the Linux kernel, which lacks a check for the mmap minimum address. This makes it easier for attackers to exploit kernel NULL pointer dereferences on non-SMAP platforms. The problem is associated with a capability check for the wrong task, potentially allowing an attacker to cause a denial of service.
Recommendations
For Linux kernel versions prior to 4.20.14, update to version 4.20.14 or later to resolve the issue. As a temporary workaround, consider restricting access to the expand downwards function in mm/mmap.c to minimize the risk of exploitation.
Exploit
Fix
NULL Pointer Dereference
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Centos
Linux Kernel
Red Hat
Suse
Ubuntu