{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "24e09cbf480a72f9c952af4ca77b159503dca44b"
            },
            {
              "fixed": "2b922a42b531a82d7881add14a7698dcdc5e1f0a"
            },
            {
              "fixed": "13a89ada5dcfc2539514c83ba5a2c61157f1ec6c"
            },
            {
              "fixed": "3700f0788da6acf73b2df56690f4b201aa4aefd2"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.26"
            },
            {
              "fixed": "6.18.27"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46014.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Add missing save/restore handling of LBR MSRs\n\nMSR_IA32_DEBUGCTLMSR and LBR MSRs are currently not enumerated by\nKVM_GET_MSR_INDEX_LIST, and LBR MSRs cannot be set with KVM_SET_MSRS. So\nsave/restore is completely broken.\n\nFix it by adding the MSRs to msrs_to_save_base, and allowing writes to\nLBR MSRs from userspace only (as they are read-only MSRs) if LBR\nvirtualization is enabled.  Additionally, to correctly restore L1's LBRs\nwhile L2 is running, make sure the LBRs are copied from the captured\nVMCB01 save area in svm_copy_vmrun_state().\n\nNote, for VMX, this also fixes a flaw where MSR_IA32_DEBUGCTLMSR isn't\nreported as an MSR to save/restore.\n\nNote #2, over-reporting MSR_IA32_LASTxxx on Intel is ok, as KVM already\nhandles unsupported reads and writes thanks to commit b5e2fec0ebc3 (\"KVM:\nIgnore DEBUGCTL MSRs with no effect\") (kvm_do_msr_access() will morph the\nunsupported userspace write into a nop).\n\n[sean: guard with lbrv checks, massage changelog]",
  "id": "CVE-2026-46014",
  "modified": "2026-07-08T05:35:57.539672246Z",
  "published": "2026-05-27T12:56:16.052Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/13a89ada5dcfc2539514c83ba5a2c61157f1ec6c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b922a42b531a82d7881add14a7698dcdc5e1f0a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3700f0788da6acf73b2df56690f4b201aa4aefd2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46014.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46014"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "KVM: SVM: Add missing save/restore handling of LBR MSRs"
}