NetSight
IP …
medium4.7

CVE-2023-0045

The current implementation of the prctl syscall does not issue an IBPB immediately during the syscall.

Impact

The current implementation of the prctl syscall does not issue an IBPB immediately during the syscall. The ib_prctl_set  function updates the Thread Information Flags (TIFs) for the task and updates the SPEC_CTRL MSR on the function __speculation_ctrl_update, but the IBPB is only issued on the next schedule, when the TIF bits are checked. This leaves the victim vulnerable to values already injected on the BTB, prior to the prctl syscall.  The patch that added the support for the conditional mitigation via prctl (ib_prctl_set) dates back to the kernel 4.9.176. We recommend upgrading past commit a664ec9158eeddd75121d39c9a0758016097fa96

Affected products

VendorProductAffected versions
LinuxLinux Kernel
from 3.16.68 before 3.17
from 4.4.180 before 4.5
from 4.9.176 before 4.10
from 4.14.86 before 4.14.303
from 4.19.7 before 4.19.270
from 4.20 before 5.4.229
DebianDebian Linux
Version 10.0
NetappActive Iq Unified Manager
All versions
NetappH300s Firmware
All versions
NetappH500s Firmware
All versions
NetappH700s Firmware
All versions
NetappH410s Firmware
All versions
NetappH410c Firmware
All versions

Weakness classification

CWE-610

References