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CVE-2018-1087

UnknownEPSS 0.77%

Last modified

CVE-2018-1087 is a vulnerability of currently unknown severity. kernel KVM before versions kernel 4.16, kernel 4.16-rc7, kernel 4.17-rc1, kernel 4.17-rc2 and kernel 4.17-rc3 is vulnerable to a flaw in the way the Linux kernel's KVM hypervisor handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, the processor did not deliver interrupts and exceptions, rather they are delivered once the first instruction after the stack switch is executed. EPSS estimates a 0.77% chance of exploitation in the next 30 days.

Description

kernel KVM before versions kernel 4.16, kernel 4.16-rc7, kernel 4.17-rc1, kernel 4.17-rc2 and kernel 4.17-rc3 is vulnerable to a flaw in the way the Linux kernel's KVM hypervisor handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, the processor did not deliver interrupts and exceptions, rather they are delivered once the first instruction after the stack switch is executed. An unprivileged KVM guest user could use this flaw to crash the guest or, potentially, escalate their privileges in the guest.

Metrics

EPSS Probability
0.77%

51.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
LinuxLinux Kernel4.16—
LinuxLinux Kernel4.17Rc1
CanonicalUbuntu Linux14.04—
CanonicalUbuntu Linux16.04—
CanonicalUbuntu Linux17.10—
DebianDebian Linux8.0—
DebianDebian Linux9.0—
RedhatEnterprise Linux7.0—
RedhatEnterprise Linux Desktop7.0—
RedhatEnterprise Linux Server7.0—
RedhatEnterprise Linux Server Aus7.2—
RedhatEnterprise Linux Server Aus7.3—
RedhatEnterprise Linux Server Aus7.4—
RedhatEnterprise Linux Server Eus7.3—
RedhatEnterprise Linux Server Eus7.4—
RedhatEnterprise Linux Server Eus7.5—
RedhatEnterprise Linux Server Tus7.2—
RedhatEnterprise Linux Server Tus7.3—
RedhatEnterprise Linux Server Tus7.4—
RedhatEnterprise Linux Virtualization4.0—
RedhatEnterprise Linux Workstation7.0—

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2018-1087?
kernel KVM before versions kernel 4.16, kernel 4.16-rc7, kernel 4.17-rc1, kernel 4.17-rc2 and kernel 4.17-rc3 is vulnerable to a flaw in the way the Linux kernel's KVM hypervisor handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, the processor did not deliver interrupts and exceptions, rather they are delivered once the first instruction after the stack switch is executed. An unprivileged KVM guest user could use this flaw to crash the guest or, potentially, escalate their privileges in the guest.
How severe is CVE-2018-1087?
Severity scoring for CVE-2018-1087 is pending analysis. The EPSS model estimates a 0.77% probability of exploitation in the next 30 days.
How do I fix CVE-2018-1087?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-1087?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST