CVE-2022-48861: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: vdpa: fix use-after-free on vp_vdpa_remove When vp_vdpa driver is unbind, vp_vdpa is freed in vdpa_unregister_device and then vp_vdpa->mdev.pci_dev is dereferenced in vp_modern_remove, triggering use-after-free. Call Trace of unbinding driver free vp_vdpa : do_syscall_64 vfs_write kernfs_fop_write_iter device_release_driver_internal pci_device_remove vp_vdpa_remove vdpa_unregister_device kobject_release device_release kfree Call Trace of dereference vp_vdpa->mdev.pci_dev: vp_modern_remove pci_release_selected_regions pci_release_region pci_resource_len pci_resource_end (dev)->resource[(bar)].end

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.13 — 5.15.29
linux	linux_kernel	5.16 — 5.16.15

References

Advisories & Patches

https://git.kernel.org/stable/c/4b1743bc715a3691a63ac21b349079b07bf1b19e https://git.kernel.org/stable/c/dc54ba9932aeaaa1a21fe214af1f446593a78274 https://git.kernel.org/stable/c/eb057b44dbe35ae14527830236a92f51de8f9184 https://git.kernel.org/stable/c/4b1743bc715a3691a63ac21b349079b07bf1b19e https://git.kernel.org/stable/c/dc54ba9932aeaaa1a21fe214af1f446593a78274 https://git.kernel.org/stable/c/eb057b44dbe35ae14527830236a92f51de8f9184

Frequently Asked Questions

What is CVE-2022-48861? +

In the Linux kernel, the following vulnerability has been resolved: vdpa: fix use-after-free on vp_vdpa_remove When vp_vdpa driver is unbind, vp_vdpa is freed in vdpa_unregister_device and then vp_vdpa->mdev.pci_dev is dereferenced in vp_modern_remove, triggering use-after-free. Call Trace of unbinding driver free vp_vdpa : do_syscall_64 vfs_write kernfs_fop_write_iter device_release_driver_internal pci_device_remove vp_vdpa_remove vdpa_unregister_device kobject_release device_release kfree Call Trace of dereference vp_vdpa->mdev.pci_dev: vp_modern_remove pci_release_selected_regions pci_release_region pci_resource_len pci_resource_end (dev)->resource[(bar)].end It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-48861? +

CVE-2022-48861 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2022-48861? +

CVE-2022-48861 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-48861? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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