CVE-2021-47255 - OpenCVE

In the Linux kernel, the following vulnerability has been resolved: kvm: LAPIC: Restore guard to prevent illegal APIC register access Per the SDM, "any access that touches bytes 4 through 15 of an APIC register may cause undefined behavior and must not be executed." Worse, such an access in kvm_lapic_reg_read can result in a leak of kernel stack contents. Prior to commit 01402cf81051 ("kvm: LAPIC: write down valid APIC registers"), such an access was explicitly disallowed. Restore the guard that was removed in that commit.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

No data.

No data.

No data.

References

Link	Providers
https://git.kernel.org/stable/c/018685461a5b9a9a70e664ac77aef0d7415a3fd5
https://git.kernel.org/stable/c/218bf772bddd221489c38dde6ef8e917131161f6
https://git.kernel.org/stable/c/a2aff09807fbe4018c269d3773a629949058b210
https://git.kernel.org/stable/c/bf99ea52970caeb4583bdba1192c1f9b53b12c84
https://lore.kernel.org/linux-cve-announce/2024052146-CVE-2021-47255-c840@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2021-47255
https://www.cve.org/CVERecord?id=CVE-2021-47255

History

Mon, 04 Nov 2024 12:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-05-21T14:19:50.125Z

Updated: 2024-11-04T12:02:24.105Z

Reserved: 2024-04-10T18:59:19.539Z

Link: CVE-2021-47255

Vulnrichment

Updated: 2024-08-04T05:32:07.995Z

NVD

Status : Awaiting Analysis

Published: 2024-05-21T15:15:14.303

Modified: 2024-05-21T16:54:26.047

Link: CVE-2021-47255

Redhat

Severity : Low

Publid Date: 2024-05-21T00:00:00Z

Links: CVE-2021-47255 - Bugzilla

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