CVE-2015-7513: Divide by Zero
First published: Tue Nov 24 2015(Updated: )
arch/x86/kvm/x86.c in the Linux kernel before 4.4 does not reset the PIT counter values during state restoration, which allows guest OS users to cause a denial of service (divide-by-zero error and host OS crash) via a zero value, related to the kvm_vm_ioctl_set_pit and kvm_vm_ioctl_set_pit2 functions.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <4.4 | |
| Linux Linux kernel | =4.4 | |
| Linux Linux kernel | =4.4-rc1 | |
| Linux Linux kernel | =4.4-rc2 | |
| Linux Linux kernel | =4.4-rc3 | |
| Linux Linux kernel | =4.4-rc4 | |
| Linux Linux kernel | =4.4-rc5 | |
| Linux Linux kernel | =4.4-rc6 | |
| Debian Debian Linux | =7.0 | |
| Debian Debian Linux | =8.0 | |
| Fedoraproject Fedora | =22 | |
| Fedoraproject Fedora | =23 | |
| Canonical Ubuntu Linux | =12.04 | |
| Canonical Ubuntu Linux | =14.04 | |
| Canonical Ubuntu Linux | =15.04 | |
| Canonical Ubuntu Linux | =15.10 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0185604c2d82c560dab2f2933a18f797e74ab5a8
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176484.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175792.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176194.html
- http://www.debian.org/security/2016/dsa-3434
- http://www.openwall.com/lists/oss-security/2016/01/07/2
- http://www.securityfocus.com/bid/79901
- http://www.securitytracker.com/id/1034602
- http://www.ubuntu.com/usn/USN-2886-1
- http://www.ubuntu.com/usn/USN-2887-1
- http://www.ubuntu.com/usn/USN-2887-2
- http://www.ubuntu.com/usn/USN-2888-1
- http://www.ubuntu.com/usn/USN-2889-1
- http://www.ubuntu.com/usn/USN-2889-2
- http://www.ubuntu.com/usn/USN-2890-1
- http://www.ubuntu.com/usn/USN-2890-2
- http://www.ubuntu.com/usn/USN-2890-3
- https://bugzilla.redhat.com/show_bug.cgi?id=1284847
- https://github.com/torvalds/linux/commit/0185604c2d82c560dab2f2933a18f797e74ab5a8
- https://launchpad.net/bugs/cve/CVE-2015-7513
- https://git.kernel.org/linus/0185604c2d82c560dab2f2933a18f797e74ab5a8
- http://wiki.osdev.org/Programmable_Interval_Timer
- http://www.osdever.net/bkerndev/Docs/pit.htm
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1296142
- https://access.redhat.com/support/policy/updates/errata/
- https://security-tracker.debian.org/tracker/CVE-2015-7513
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7513
- https://nvd.nist.gov/vuln/detail/CVE-2015-7513
- https://ubuntu.com/security/CVE-2015-7513
Frequently Asked Questions
What is the vulnerability ID for this vulnerability?
The vulnerability ID for this vulnerability is CVE-2015-7513.
What is the severity level of CVE-2015-7513?
CVE-2015-7513 has a severity level of medium (4).
How does CVE-2015-7513 impact the Linux kernel?
CVE-2015-7513 allows guest OS users to cause a denial of service (divide-by-zero error and host OS crash) via a zero value.
Which versions of the Linux kernel are affected by CVE-2015-7513?
The Linux kernel versions before 4.4 are affected by CVE-2015-7513.
Are there any known solutions or remedies for CVE-2015-7513?
Yes, updating to Linux kernel version 4.4~ or later can mitigate CVE-2015-7513.
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