Denial of service in Linux kernel - CVE-2017-7645

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Main Vulnerability Database Vulnerabilities #VU6659

Denial of service in Linux kernel - CVE-2017-7645

Published: May 23, 2017 / Updated: June 30, 2017


Vulnerability identifier: #VU6659
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-7645
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists due to a flaw in the NFSv2/NFSv3 server in the nfsd subsystem. A remote attacker can use a long RPC reply related to net/sunrpc/svc.c, fs/nfsd/nfs3xdr.c, and fs/nfsd/nfsxdr.c. and cause the system to crash.

Successful exploitation of the vulnerability results in denial of service.

Affected software

Linux kernel
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux Server for ARM
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux Server - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
SUSE Linux
Fedora

MRG Realtime
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel

How to mitigate CVE-2017-7645

Update to version 4.10.12.

kernel (Red Hat package) - update to 3.10.0-514.26.1.el7
kernel-rt (Red Hat package) - addressed in versions 3.10.0-514.rt56.228.el6rt, 3.10.0-514.26.1.rt56.442.el7
kernel - addressed in versions 4.10.12-100.fc24, 4.10.12-200.fc25, 4.10.13-100.fc24

External References

Related Security Bulletins