CVE-2016-0774

Published: 27 April 2016

The (1) pipe_read and (2) pipe_write implementations in fs/pipe.c in a certain Linux kernel backport in the linux package before 3.2.73-2+deb7u3 on Debian wheezy and the kernel package before 3.10.0-229.26.2 on Red Hat Enterprise Linux (RHEL) 7.1 do not properly consider the side effects of failed __copy_to_user_inatomic and __copy_from_user_inatomic calls, which allows local users to cause a denial of service (system crash) or possibly gain privileges via a crafted application, aka an "I/O vector array overrun." NOTE: this vulnerability exists because of an incorrect fix for CVE-2015-1805.

From the Ubuntu Security Team

It was discovered that the Linux kernel did not keep accurate track of pipe buffer details when error conditions occurred, due to an incomplete fix for CVE-2015-1805. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code with administrative privileges.

Notes

android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.10 and earlier preview kernels
linux-lts-saucy no longer receives official support
linux-lts-quantal no longer receives official support

Status

Severity score breakdown

References

• http://www.openwall.com/lists/oss-security/2016/03/26/2
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-0774
• https://ubuntu.com/security/notices/USN-2967-2
• https://ubuntu.com/security/notices/USN-2967-1
• https://ubuntu.com/security/notices/USN-2968-1
• https://ubuntu.com/security/notices/USN-2968-2
• https://www.cve.org/CVERecord?id=CVE-2016-0774
• NVD
• Launchpad
• Debian

Bugs

• https://launchpad.net/bugs/1563916