cbcvebase.
CVE-2023-0045
published 2023-04-25

CVE-2023-0045: 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…

PriorityP343high7.5CVSS 3.1
AVNACLPRNUINSUCHINAN
EPSS
2.40%
82.2th percentile
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

22 ranges
VendorProductVersion rangeFixed in
debiandebian_linux
debianlinux< linux 6.1.7-1 (bookworm)linux 6.1.7-1 (bookworm)
googlechrome_chrome
linuxlinux_kernel>= 0 < 5.10.178-15.10.178-1
linuxlinux_kernel>= 0 < 6.1.7-16.1.7-1
linuxlinux_kernel>= 0 < 6.1.7-16.1.7-1
linuxlinux_kernel>= 0 < 6.1.7-16.1.7-1
linuxlinux_kernel>= 0 < 4.15.0-208.2204.15.0-208.220
linuxlinux_kernel>= 0 < 5.4.0-144.1615.4.0-144.161
linuxlinux_kernel>= 0 < 5.15.0-69.765.15.0-69.76
linuxlinux_kernel>= 0 < 4.4.0-237.2714.4.0-237.271
linuxlinux_kernel>= 3.16.68 < 3.173.17
linuxlinux_kernel>= 4.14.86 < 4.14.3034.14.303
linuxlinux_kernel>= 4.19.7 < 4.19.2704.19.270
linuxlinux_kernel>= 4.20 < 5.4.2295.4.229
linuxlinux_kernel>= 4.4.180 < 4.54.5
linuxlinux_kernel>= 4.9.176 < 4.104.10
linuxlinux_kernel>= 5.11 < 5.15.875.15.87
linuxlinux_kernel>= 5.16 < 6.0.196.0.19
linuxlinux_kernel>= 5.5.0 < 5.10.1635.10.163
linuxlinux_kernel>= 6.1 < 6.1.56.1.5
linuxlinux_kernel>= 9137bb27e60e < a664ec9158eeddd75121d39c9a0758016097fa96a664ec9158eeddd75121d39c9a0758016097fa96

CVSS provenance

nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
osv8.8HIGH
vendor_ubuntu7.8HIGH
vendor_debian4.7MEDIUM
vendor_redhat4.7MEDIUM
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