drm/vmwgfx: Fix stale file descriptors on failed usercopy
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.
02 / AFFECTED SOFTWARE
Affected packages
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/0008a0c78fc33a84e2212a7c04e6b21a36ca6f4d
- https://git.kernel.org/stable/c/1d833b27fb708d6fdf5de9f6b3a8be4bd4321565
- https://git.kernel.org/stable/c/6066977961fc6f437bc064f628cf9b0e4571c56c
- https://git.kernel.org/stable/c/84b1259fe36ae0915f3d6ddcea6377779de48b82
- https://git.kernel.org/stable/c/a0f90c8815706981c483a652a6aefca51a5e191c
- https://git.kernel.org/stable/c/ae2b20f27732fe92055d9e7b350abc5cdf3e2414
- https://git.kernel.org/stable/c/e8d092a62449dcfc73517ca43963d2b8f44d0516
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48771.json
- https://nvd.nist.gov/vuln/detail/CVE-2022-48771