CVE-2022-48771

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxc906965dee22d5e95d0651759ba107b420212a9f < e8d092a62449dcfc73517ca43963d2b8f44d0516affected
LinuxLinuxc906965dee22d5e95d0651759ba107b420212a9f < 0008a0c78fc33a84e2212a7c04e6b21a36ca6f4daffected
LinuxLinuxc906965dee22d5e95d0651759ba107b420212a9f < 84b1259fe36ae0915f3d6ddcea6377779de48b82affected
LinuxLinuxc906965dee22d5e95d0651759ba107b420212a9f < ae2b20f27732fe92055d9e7b350abc5cdf3e2414affected
LinuxLinuxc906965dee22d5e95d0651759ba107b420212a9f < 6066977961fc6f437bc064f628cf9b0e4571c56caffected
LinuxLinuxc906965dee22d5e95d0651759ba107b420212a9f < 1d833b27fb708d6fdf5de9f6b3a8be4bd4321565affected
LinuxLinuxc906965dee22d5e95d0651759ba107b420212a9f < a0f90c8815706981c483a652a6aefca51a5e191caffected
LinuxLinux4.14affected
LinuxLinux0 < 4.14unaffected
LinuxLinux4.14.264 <= 4.14.*unaffected
LinuxLinux4.19.227 <= 4.19.*unaffected
LinuxLinux5.4.175 <= 5.4.*unaffected
LinuxLinux5.10.95 <= 5.10.*unaffected
LinuxLinux5.15.18 <= 5.15.*unaffected
LinuxLinux5.16.4 <= 5.16.*unaffected
LinuxLinux5.17 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References