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CVE-2021-47390

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Fix stack-out-of-bounds memory access from ioapic_write_indirect() KASAN reports the following issue: BUG: KASAN: s…

Published May 21, 2024CWE-125EPSS 0.26%

Overview

CVE-2021-47390 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

KVM: x86: Fix stack-out-of-bounds memory access from ioapic_write_indirect()

KASAN reports the following issue:

BUG: KASAN: stack-out-of-bounds in kvm_make_vcpus_request_mask+0x174/0x440 [kvm]

Read of size 8 at addr ffffc9001364f638 by task qemu-kvm/4798

CPU: 0 PID: 4798 Comm: qemu-kvm Tainted: G X --------- ---

Hardware name: AMD Corporation DAYTONA_X/DAYTONA_X, BIOS RYM0081C 07/13/2020

Call Trace:

dump_stack+0xa5/0xe6

print_address_description.constprop.0+0x18/0x130

? kvm_make_vcpus_request_mask+0x174/0x440 [kvm]

__kasan_report.cold+0x7f/0x114

? kvm_make_vcpus_request_mask+0x174/0x440 [kvm]

kasan_report+0x38/0x50

kasan_check_range+0xf5/0x1d0

kvm_make_vcpus_request_mask+0x174/0x440 [kvm]

kvm_make_scan_ioapic_request_mask+0x84/0xc0 [kvm]

? kvm_arch_exit+0x110/0x110 [kvm]

? sched_clock+0x5/0x10

ioapic_write_indirect+0x59f/0x9e0 [kvm]

? static_obj+0xc0/0xc0

? __lock_acqu

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/2f9b68f57c6278c322793a06063181deded0ad69Refgit.kernel.org/stable/c/99a9e9b80f19fc63be005a33d76211dd23114792Refgit.kernel.org/stable/c/bebabb76ad9acca8858e0371e102fb60d708e25bRefgit.kernel.org/stable/c/2f9b68f57c6278c322793a06063181deded0ad69Refgit.kernel.org/stable/c/99a9e9b80f19fc63be005a33d76211dd23114792Refgit.kernel.org/stable/c/bebabb76ad9acca8858e0371e102fb60d708e25b

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47390?

CVE-2021-47390 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2021-47390?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47390?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47390?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47390 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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