Externally Controlled Reference to a Resource in Another Sphere Affecting kernel-macros package, versions <4.12.14-150100.197.137.2


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.14% (52nd percentile)

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  • Snyk IDSNYK-SLES151-KERNELMACROS-3362671
  • published17 Mar 2023
  • disclosed16 Mar 2023

Introduced: 16 Mar 2023

CVE-2023-0045  (opens in a new tab)
CWE-610  (opens in a new tab)

How to fix?

Upgrade SLES:15.1 kernel-macros to version 4.12.14-150100.197.137.2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-macros package and not the kernel-macros package as distributed by SLES. See How to fix? for SLES:15.1 relevant fixed versions and status.

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

CVSS Scores

version 3.1