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Fencer Intel
medium 6.5

CVE-2015-7513 json

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 use…

published 2016-02-08 10 y ago modified 2026-06-17 4 mo ago also EUVD-2015-7434

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

Summary

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.

Patch / fix

  • linux linux_kernel 4.4
  • linux Debian 14, Debian 13, Debian 12 4.3.3-3

debian advisories DEBIAN-CVE-2015-7513

  • linux Ubuntu 14.04 LTS 3.13.0-77.121
  • linux-lts-wily Ubuntu 14.04 LTS 4.2.0-27.32~14.04.1
  • linux-lts-vivid Ubuntu 14.04 LTS 3.19.0-49.55~14.04.1
  • linux-lts-utopic Ubuntu 14.04 LTS 3.16.0-60.80~14.04.1

ubuntu advisories UBUNTU-CVE-2015-7513

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-rt SLE Real Time 11 SP4 3.0.101.rt130-65.1
  • kernel-syms-rt SLE Real Time 11 SP4 3.0.101.rt130-65.1
  • kernel-rt_trace SLE Real Time 11 SP4 3.0.101.rt130-65.1
  • kernel-source-rt SLE Real Time 11 SP4 3.0.101.rt130-65.1
  • kernel-ec2 SLES for SAP 11 SP4, SLES 11 SP4 3.0.101-88.1
  • kernel-pae SLES for SAP 11 SP4, SLES 11 SP4 3.0.101-88.1
  • kernel-xen SLES for SAP 11 SP4, SLES 11 SP4 3.0.101-88.1
  • kernel-syms SLES for SAP 11 SP4, SLES 11 SP4 3.0.101-88.1

suse advisories SUSE-SU-2017:0333-1SUSE-SU-2016:3069-1SUSE-SU-2016:2976-1SUSE-SU-2016:2245-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-7513 updated cvss 4.3

Kernel: kvm: divide by zero issue leads to DoS

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, python-perf, kernel-kdump, kernel-tools, +3 more
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 7 kernel-rt, kernel-rt-kvm, kernel-rt-trace, kernel-rt-debug-kvm, kernel-rt-trace-kvm Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.56% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
NVD 2.0 4.9 AV:L/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.