CVE-2023-0045

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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.\n\nWe recommend upgrading past commit\u00a0a664ec9158eeddd75121d39c9a0758016097fa96\n\n"}], "lastModified": "2023-08-11T19:53:56.443", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9B65A009-A8A9-422E-88B3-98A19BF90A72", "versionEndExcluding": "3.17", "versionStartIncluding": "3.16.68"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A2176BEA-36C2-4A46-8200-B6D084086D22", "versionEndExcluding": "4.5", "versionStartIncluding": "4.4.180"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "609BE142-0BB2-432B-AC70-4E7C3DA4616A", 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