What’s Vulnerable › Vulnerabilities

CVE-2015-7513

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2016-02-08 · updated 2026-06-17
• Weakness: CWE-369

Description

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.

Affected products

• Canonical Ubuntu Linux: 12.04, 14.04, 15.04, 15.10
• Debian Linux: 7.0, 8.0
• Fedoraproject Fedora: 22, 23
• Linux kernel: before 4.4; 4.4, 4.4-rc1, 4.4-rc2, 4.4-rc3, 4.4-rc4, 4.4-rc5 (+1) — fixed in 4.4

How to fix

Upgrade to a fixed version: Linux kernel 4.4. Check the vendor advisory for mitigations.

References

• 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

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