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CVE-2021-47341

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: KVM: mmio: Fix use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio BUG: KASAN: use-after-free in kvm_vm_ioctl_unregis…

Published May 21, 2024CWE-416EPSS 0.26%

Overview

CVE-2021-47341 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, 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: mmio: Fix use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio

BUG: KASAN: use-after-free in kvm_vm_ioctl_unregister_coalesced_mmio+0x7c/0x1ec arch/arm64/kvm/../../../virt/kvm/coalesced_mmio.c:183

Read of size 8 at addr ffff0000c03a2500 by task syz-executor083/4269

CPU: 5 PID: 4269 Comm: syz-executor083 Not tainted 5.10.0 #7

Hardware name: linux,dummy-virt (DT)

Call trace:

dump_backtrace+0x0/0x2d0 arch/arm64/kernel/stacktrace.c:132

show_stack+0x28/0x34 arch/arm64/kernel/stacktrace.c:196

__dump_stack lib/dump_stack.c:77 [inline]

dump_stack+0x110/0x164 lib/dump_stack.c:118

print_address_description+0x78/0x5c8 mm/kasan/report.c:385

__kasan_report mm/kasan/report.c:545 [inline]

kasan_report+0x148/0x1e4 mm/kasan/report.c:562

check_memory_region_inline mm/kasan/generic.c:183 [inline]

__asan_load8+0xb4/0xbc mm/kasan/generic.c:252

kvm_vm_ioctl_unregister_coalesced_mmio+0x7c/0x1ec arch/arm64/kvm/../..

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/069d44a24c0ff8f85adf49233aae7a8ca16f5c7eRefgit.kernel.org/stable/c/23fa2e46a5556f787ce2ea1a315d3ab93cced204Refgit.kernel.org/stable/c/679837dc0abaa2c6e2a7bcd86483e05eee1d5066Refgit.kernel.org/stable/c/8d7c539316d652d217e5e82b89ee204c812a7061Refgit.kernel.org/stable/c/f2ff9d03432fcb160e9f7d4be26174d89de2779aRefgit.kernel.org/stable/c/069d44a24c0ff8f85adf49233aae7a8ca16f5c7eRefgit.kernel.org/stable/c/23fa2e46a5556f787ce2ea1a315d3ab93cced204Refgit.kernel.org/stable/c/679837dc0abaa2c6e2a7bcd86483e05eee1d5066Refgit.kernel.org/stable/c/8d7c539316d652d217e5e82b89ee204c812a7061Refgit.kernel.org/stable/c/f2ff9d03432fcb160e9f7d4be26174d89de2779a

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47341?

CVE-2021-47341 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47341?

This vulnerability has a CVSS 3.1 base score of 7.8, 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-2021-47341?

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-2021-47341?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47341 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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