CVE-2023-0045 (GCVE-0-2023-0045)

Vulnerability from cvelistv5 – Published: 2023-04-25 22:44 – Updated: 2025-02-13 16:38
VLAI?
Title
Incorrect indirect branch prediction barrier in the Linux Kernel
Summary
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
Severity ?
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-610 - Externally Controlled Reference to a Resource in Another Sphere
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Kernel Affected: 9137bb27e60e , < a664ec9158eeddd75121d39c9a0758016097fa96 (git)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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