CVE-2019-6974 describes a use-after-free vulnerability in the Linux kernel, specifically within the kvm_ioctl_create_device function, affecting versions prior to 4.20.8. This flaw stems from a race condition during reference counting, impacting various Linux distributions including Canonical, Debian, F5, and Red Hat. With a CVSS score of 8.1 (HIGH), this vulnerability is remotely exploitable with high impact on confidentiality, integrity, and availability, though it requires high attack complexity. While not listed on CISA's KEV catalog and showing no signs of active exploitation or significant community discussion, a public exploit (EDB-46388) demonstrating a NULL pointer dereference exists.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 3.10, < 3.16.64CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 3.17, < 3.18.136CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 3.19, < 4.4.176CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 4.5, < 4.9.156CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 4.10, < 4.14.99CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
In the Linux kernel before 4.20.8, kvm_ioctl_create_device in virt/kvm/kvm_main.c mishandles reference counting because of a race condition, leading to a use-after-free.
Feb 15, 2019Kernel: KVM: potential use-after-free via kvm_ioctl_create_device()
Feb 7, 2019