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{"bugzilla": {"description": "kernel: Bypassing Spectre-BTI User Space Mitigations", "id": "2167288", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2167288"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-610", "details": ["The current implementation of the prctl syscall does not issue an IBPB immediately during the syscall. The ib_prctl_set \u00a0function 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. \u00a0The patch that added the support for the conditional mitigation via prctl (ib_prctl_set) dates back to the kernel 4.9.176.\nWe recommend upgrading past commit\u00a0a664ec9158eeddd75121d39c9a0758016097fa96", "A flaw was found in the Linux kernel. This issue occurs due to a failure mitigating the Spectre-BTI attack (using the kernel API), as IBPB is not issued during the syscall until the next schedule, leaving the system vulnerable."], "mitigation": {"lang": "en:us", "value": "For user-mode applications, a usleep after the prctl call will force a reschedule and ensure the correct mitigation."}, "name": "CVE-2023-0045", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2023-02-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-0045\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-0045\nhttps://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=a664ec9158eeddd75121d39c9a0758016097fa96\nhttps://github.com/es0j/CVE-2023-0045\nhttps://www.openwall.com/lists/oss-security/2023/02/03/1"], "threat_severity": "Low"}