Externally Controlled Reference to a Resource in Another Sphere Affecting kernel-debug-core package, versions *
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Test your applications- Snyk ID SNYK-RHEL8-KERNELDEBUGCORE-3311653
- published 6 Feb 2023
- disclosed 3 Feb 2023
Introduced: 3 Feb 2023
CVE-2023-0045 Open this link in a new tabHow to fix?
There is no fixed version for RHEL:8 kernel-debug-core.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug-core package and not the kernel-debug-core package as distributed by RHEL.
See How to fix? for RHEL:8 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
References
- https://access.redhat.com/security/cve/CVE-2023-0045
- https://git.kernel.org/tip/a664ec9158eeddd75121d39c9a0758016097fa96
- https://github.com/google/security-research/security/advisories/GHSA-9x5g-vmxf-4qj8
- https://lists.debian.org/debian-lts-announce/2023/05/msg00005.html
- https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html
- https://security.netapp.com/advisory/ntap-20230714-0001/