CVE-2015-7513: canonical ubuntu_linux Divide By Zero
Vulnerability summary
CVE-2015-7513 is a medium (CVSS 6.5) Divide By Zero vulnerability in canonical ubuntu_linux. EPSS estimates a 0.56% chance of exploitation in the next 30 days, higher than 46.8% of scored vulnerabilities.
Not severe (CVSS 6.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 9 · Related 8Timeline
- 08-02-2016PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
5 scores · 3 sources · 3 versions- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
EPSS trend
Probability
0.56%
Chance of exploitation in the next 30 days
Percentile
47%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.56% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu21 products
- linux< 3.13.0-77.121
- linux-azureAll versions (No fix recorded)
- linux-azure-6.11All versions (No fix recorded)
- linux-azure-fdeAll versions (No fix recorded)
- linux-azure-fde-5.15All versions (No fix recorded)
Debian2 products
- linux< 4.3.3-3
- debian_linuxEOL7.0 | 8.0
Canonical1 product
- ubuntu_linuxEOL12.04 | 14.04 | 15.04 | 15.10
Fedoraproject1 product
- fedoraEOL22 | 23
Linux1 product
- linux_kernel< 4.4 | 4.4 | 4.4:rc1 | 4.4:rc2 | 4.4:rc3 | 4.4:rc4 | 4.4:rc5 | 4.4:rc6
5 vendors · 26 products
References
33 links- www.openwall.com/lists/oss-security/2016/01/07/2Mailing ListX Refsource MLISTPatchThird Party Advisory
- lists.fedoraproject.org/pipermail/package-announce/2016-January/175792.htmlVendor AdvisoryX Refsource FEDORAThird Party Advisory
- github.com/torvalds/linux/commit/0185604c2d82c560dab2f2933a18f797e74ab5a8X Refsource CONFIRMPatchThird Party Advisory
- lists.fedoraproject.org/pipermail/package-announce/2016-January/176194.htmlVendor AdvisoryX Refsource FEDORAThird Party Advisory
Show all 33 references
- lists.fedoraproject.org/pipermail/package-announce/2016-February/176484.htmlVendor AdvisoryX Refsource FEDORAThird Party Advisory
- bugzilla.redhat.com/show_bug.cgi?id=1284847X Refsource CONFIRMIssue TrackingPatchThird Party Advisory
