CVE-2022-48771: drm/vmwgfx: Fix stale file descriptors on failed usercopy

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-06-20 · updated 2026-08-04
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: Fix stale file descriptors on failed usercopy A failing usercopy of the fence_rep object will lead to a stale entry in the file descriptor table as put_unused_fd() won't release it. This enables userland to refer to a dangling 'file' object through that still valid file descriptor, leading to all kinds of use-after-free exploitation scenarios. Fix this by deferring the call to fd_install() until after the usercopy has succeeded.

Affected products

Linux kernel: from 4.14 before 4.14.264; from 4.15 before 4.19.227; from 4.20 before 5.4.175; from 5.5 before 5.10.95; from 5.11 before 5.15.18; from 5.16 before 5.16.4 — fixed in 4.14.264, 4.19.227, 5.10.95, 5.15.18, 5.16.4, 5.4.175

How to fix

Upgrade to a fixed version: Linux kernel 4.14.264, 4.19.227, 5.10.95, 5.15.18. Check the vendor advisory for mitigations.

References

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