CVE-2024-58083: KVM: Explicitly verify target vCPU is online in kvm_get_vcpu()
First published: Thu Mar 06 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: KVM: Explicitly verify target vCPU is online in kvm_get_vcpu() Explicitly verify the target vCPU is fully online _prior_ to clamping the index in kvm_get_vcpu(). If the index is "bad", the nospec clamping will generate '0', i.e. KVM will return vCPU0 instead of NULL. In practice, the bug is unlikely to cause problems, as it will only come into play if userspace or the guest is buggy or misbehaving, e.g. KVM may send interrupts to vCPU0 instead of dropping them on the floor. However, returning vCPU0 when it shouldn't exist per online_vcpus is problematic now that KVM uses an xarray for the vCPUs array, as KVM needs to insert into the xarray before publishing the vCPU to userspace (see commit c5b077549136 ("KVM: Convert the kvm->vcpus array to a xarray")), i.e. before vCPU creation is guaranteed to succeed. As a result, incorrectly providing access to vCPU0 will trigger a use-after-free if vCPU0 is dereferenced and kvm_vm_ioctl_create_vcpu() bails out of vCPU creation due to an error and frees vCPU0. Commit afb2acb2e3a3 ("KVM: Fix vcpu_array[0] races") papered over that issue, but in doing so introduced an unsolvable teardown conundrum. Preventing accesses to vCPU0 before it's fully online will allow reverting commit afb2acb2e3a3, without re-introducing the vcpu_array[0] UAF race.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=4.14.120<4.15 | |
| Linux Kernel | >=4.19.44<4.20 | |
| Linux Kernel | >=5.0.17<5.4.291 | |
| Linux Kernel | >=5.5<5.10.235 | |
| Linux Kernel | >=5.11<5.15.179 | |
| Linux Kernel | >=5.16<6.1.129 | |
| Linux Kernel | >=6.2<6.6.78 | |
| Linux Kernel | >=6.7<6.12.14 | |
| Linux Kernel | >=6.13<6.13.3 |
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Reference Links
- https://git.kernel.org/stable/c/d817e510662fd1c9797952408d94806f97a5fffd
- https://git.kernel.org/stable/c/125da53b3c0c9d7f58353aea0076e9efd6498ba7
- https://git.kernel.org/stable/c/f2f805ada63b536bc192458a7098388286568ad4
- https://git.kernel.org/stable/c/ca8da90ed1432ff3d000de4f1e2275d4e7d21b96
- https://git.kernel.org/stable/c/1e7381f3617d14b3c11da80ff5f8a93ab14cfc46
- https://git.kernel.org/stable/c/09d50ccf0b2d739db4a485b08afe7520a4402a63
- https://git.kernel.org/stable/c/5cce2ed69b00e022b5cdf0c49c82986abd2941a8
- https://git.kernel.org/stable/c/7c4899239d0f70f88ac42665b3da51678d122480
Frequently Asked Questions
What is the severity of CVE-2024-58083?
The severity of CVE-2024-58083 is considered to be high due to potential exploitation affecting kernel operations.
How do I fix CVE-2024-58083?
To fix CVE-2024-58083, update your Linux kernel to the latest version where the vulnerability has been patched.
What systems are affected by CVE-2024-58083?
CVE-2024-58083 affects all versions of the Linux kernel prior to the patch that addresses this vulnerability.
What impact does CVE-2024-58083 have?
CVE-2024-58083 can lead to unauthorized access to vCPU management functions, potentially compromising system stability.
When was CVE-2024-58083 made public?
CVE-2024-58083 was publicly disclosed when the associated patch was released, enabling users to become aware of the issue.
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