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🛡️ OESA-2023-1146 — kernel (CVE-2023-0045 +1 more)

🟡 CVSS 5.0 — Medium ✅ No Known Exploit OSV
5.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

kernel security update

The Linux Kernel, the operating system core itself.

Security Fix(es):

The Linux kernel does not correctly mitigate SMT attacks, as discovered

through a strange pattern in the kernel API using STIBP as a mitigation[1

<https://docs.kernel.org/userspace-api/spec_ctrl.html>], leaving the

process exposed for a short period of time after a syscall. The kernel also

does not issue an IBPB immediately during the syscall.

The ib_prctl_set [2

<https://elixir.bootlin.com/linux/v5.15.56/source/arch/x86/kernel/cpu/bugs.c#L1467>]function

updates the Thread Information Flags (TIFs) for the task and updates the

SPEC_CTRL MSR on the function __speculation_ctrl_update [3

<https://elixir.bootlin.com/linux/v5.15.56/source/arch/x86/kernel/process.c#L557>],

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 behavior is only corrected after a reschedule of the task happens.

Furthermore, the kernel entrance (due to the syscall itself), does not

issue an IBPB in the default scenarios (i.e., when the kernel protects

itself via retpoline or eIBRS).(CVE-2023-0045)

REMAP cmd of SVM driver can be used to remap read only memory as read-write, then cause read only memory/file modified..(CVE-2021-33639)

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs administrative privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: High — administrative rights are needed first.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

OESA-2023-1146 is recorded against 1 package.

  • kernel (fixed in 4.19.90-2302.5.0.0190.oe1)

Timeline and source

Published on 4 March 2023 and last revised on 18 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

www.openeuler.org (Advisory)
nvd.nist.gov (Advisory)
nvd.nist.gov (Advisory)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

Details

Severity MEDIUM
CVSS Score 5.0
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2023-03-04
Updated 2026-08-20
Modified 2026-08-18
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel — 4.19.90-2302.5.0.0190.oe1

Similar Threats

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