Use-after-free error in Linux kernel - CVE-2017-15126
Published: April 27, 2018
Vulnerability identifier: #VU12265
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2017-15126
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The weakness exists in fs/userfaultfd.c due to the handling of fork failure when dealing with event messages. Failure to fork correctly can lead to a situation where a fork event will be removed from an already freed list of events with userfaultfd_ctx_put(). A remote attacker can trigger use-after-free error and execute arbitrary code.
Successful exploitation of the vulnerability may result in system compromise.
The weakness exists in fs/userfaultfd.c due to the handling of fork failure when dealing with event messages. Failure to fork correctly can lead to a situation where a fork event will be removed from an already freed list of events with userfaultfd_ctx_put(). A remote attacker can trigger use-after-free error and execute arbitrary code.
Successful exploitation of the vulnerability may result in system compromise.
How to mitigate CVE-2017-15126
Update to version 4.13.6.