CVE-2023-0045
CVSS V2 None
CVSS V3 None
Description
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
Overview
- CVE ID
- CVE-2023-0045
- Assigner
- cve-coordination@google.com
- Vulnerability Status
- Received
- Published Version
- 2023-04-25T23:15:09
- Last Modified Date
- 2023-04-25T23:15:09
Weakness Enumerations
References
| Reference URL | Reference Tags |
|---|---|
| https://git.kernel.org/tip/a664ec9158eeddd75121d39c9a0758016097fa96 |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2023-0045 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-0045 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2023-04-26 00:01:01 | Added to TrackCVE | |||
| 2023-04-26 00:01:01 | Weakness Enumeration | new |