CVE-2023-54024

/// Technical description

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

KVM: Destroy target device if coalesced MMIO unregistration fails

Destroy and free the target coalesced MMIO device if unregistering said

device fails. As clearly noted in the code, kvm_io_bus_unregister_dev()

does not destroy the target device.

BUG: memory leak

unreferenced object 0xffff888112a54880 (size 64):

comm "syz-executor.2", pid 5258, jiffies 4297861402 (age 14.129s)

hex dump (first 32 bytes):

38 c7 67 15 00 c9 ff ff 38 c7 67 15 00 c9 ff ff 8.g.....8.g.....

e0 c7 e1 83 ff ff ff ff 00 30 67 15 00 c9 ff ff .........0g.....

backtrace:

[<0000000006995a8a>] kmalloc include/linux/slab.h:556 [inline]

[<0000000006995a8a>] kzalloc include/linux/slab.h:690 [inline]

[<0000000006995a8a>] kvm_vm_ioctl_register_coalesced_mmio+0x8e/0x3d0 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:150

[<00000000022550c2>] kvm_vm_ioctl+0x47d/0x1600 arch/x86/kvm/../../../virt/kvm/kv

/// 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