CVE-2023-0045 — The current implementation of the prctl syscall does not issue an IBPB immediate
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
Published
2023-04-25T22:44:57.262Z
Last modified
2025-02-13T16:38:41.984Z
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
01What is this vulnerability?
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…
02Affected products
| Vendor | Product | Versions |
|---|
| Linux | Linux Kernel | 9137bb27e60e |
03Active exploitation status
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.
07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2023-04-25T22:44:57.262Z
- Last modified: 2025-02-13T16:38:41.984Z
09References
- git.kernel.org — https://git.kernel.org/tip/a664ec9158eeddd75121d39c9a0758016097fa96
- lists.debian.org — https://lists.debian.org/debian-lts-announce/2023/05/msg00005.html
- lists.debian.org — https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html
- security.netapp.com — https://security.netapp.com/advisory/ntap-20230714-0001/
- github.com — https://github.com/google/security-research/security/advisories/GHSA-9x5g-vmxf-4…
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