PT-2019-4448 · Linux+4 · Linux Kernel+4
Salvatore Bonaccorso
·
Published
2018-05-31
·
Updated
2020-08-18
·
CVE-2019-15239
CVSS v3.1
7.8
High
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions prior to 4.9.190
Linux kernel versions prior to 4.14.139
Description
The issue is related to a change in the net/ipv4/tcp output.c component of the Linux kernel, which was incorrectly backported to earlier longterm kernels. This introduced a new vulnerability that can be exploited by a local attacker to trigger multiple use-after-free conditions by adding to a write queue between disconnection and re-connection. This can result in a kernel crash or potentially in privilege escalation.
Recommendations
For Linux kernel versions prior to 4.9.190, update to version 4.9.190 or later to resolve the issue.
For Linux kernel versions prior to 4.14.139, update to version 4.14.139 or later to resolve the issue.
As a temporary workaround, consider restricting access to the net/ipv4/tcp output.c component to minimize the risk of exploitation.
Exploit
Fix
Use After Free
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Centos
Linux Kernel
Red Hat
Suse