🛡️ CVE-2023-0045
🟡 CVSS 4.7 — Medium ⚠️ Exploit Public CWE-610 NVD
4.7
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

Details

Severity MEDIUM
CVSS Score 4.7
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE CWE-610
Public Exploit ⚠️ Yes
Source NVD
Published 2023-04-25
Updated 2026-06-08
Modified 2025-02-13

Affected Packages

Software From version Fixed in
active-iq-unified-manager
debian-linux
h300s-firmware
h410c-firmware
h410s-firmware
h500s-firmware
h700s-firmware
linux-kernel 6.1 6.1.5

References

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