Vulnerability Details : CVE-2023-0045
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
Exploit prediction scoring system (EPSS) score for CVE-2023-0045
Probability of exploitation activity in the next 30 days: 0.15%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 51 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2023-0045
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
---|---|---|---|---|---|
4.7
|
MEDIUM | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N |
1.0
|
3.6
|
Google Inc. |
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2023-0045
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The product uses an externally controlled name or reference that resolves to a resource that is outside of the intended control sphere.Assigned by:
- cve-coordination@google.com (Secondary)
- nvd@nist.gov (Primary)
References for CVE-2023-0045
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https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html
[SECURITY] [DLA 3403-1] linux security updateMailing List;Third Party Advisory
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https://security.netapp.com/advisory/ntap-20230714-0001/
CVE-2023-0045 Linux Kernel Vulnerability in NetApp Products | NetApp Product SecurityThird Party Advisory
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https://lists.debian.org/debian-lts-announce/2023/05/msg00005.html
[SECURITY] [DLA 3404-1] linux-5.10 security updateMailing List;Third Party Advisory
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https://git.kernel.org/tip/a664ec9158eeddd75121d39c9a0758016097fa96
kernel/git/tip/tip.git - Unnamed repository; edit this file 'description' to name the repository.Mailing List;Patch
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https://github.com/google/security-research/security/advisories/GHSA-9x5g-vmxf-4qj8
Linux Kernel: Bypassing Spectre-BTI User Space Mitigations · Advisory · google/security-research · GitHubExploit;Third Party Advisory
Products affected by CVE-2023-0045
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
- cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*