{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-55881",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Play nice with protected guests in complete_hypercall_exit()\n\nUse is_64_bit_hypercall() instead of is_64_bit_mode() to detect a 64-bit\nhypercall when completing said hypercall.  For guests with protected state,\ne.g. SEV-ES and SEV-SNP, KVM must assume the hypercall was made in 64-bit\nmode as the vCPU state needed to detect 64-bit mode is unavailable.\n\nHacking the sev_smoke_test selftest to generate a KVM_HC_MAP_GPA_RANGE\nhypercall via VMGEXIT trips the WARN:\n\n  ------------[ cut here ]------------\n  WARNING: CPU: 273 PID: 326626 at arch/x86/kvm/x86.h:180 complete_hypercall_exit+0x44/0xe0 [kvm]\n  Modules linked in: kvm_amd kvm ... [last unloaded: kvm]\n  CPU: 273 UID: 0 PID: 326626 Comm: sev_smoke_test Not tainted 6.12.0-smp--392e932fa0f3-feat #470\n  Hardware name: Google Astoria/astoria, BIOS 0.20240617.0-0 06/17/2024\n  RIP: 0010:complete_hypercall_exit+0x44/0xe0 [kvm]\n  Call Trace:\n   <TASK>\n   kvm_arch_vcpu_ioctl_run+0x2400/0x2720 [kvm]\n   kvm_vcpu_ioctl+0x54f/0x630 [kvm]\n   __se_sys_ioctl+0x6b/0xc0\n   do_syscall_64+0x83/0x160\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n   </TASK>\n  ---[ end trace 0000000000000000 ]---"
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "5969e2435cbd7f0ce8c28d717bfc39987ee8d8f1",
                                            "version_value": "0840d360a8909c722fb62459f42836afe32ededb"
                                        },
                                        {
                                            "version_affected": "<",
                                            "version_name": "b5aead0064f33ae5e693a364e3204fe1c0ac9af2",
                                            "version_value": "7ed4db315094963de0678a8adfd43c46471b9349"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "5.16",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "5.16",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "5.15.176",
                                                        "lessThanOrEqual": "5.15.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.1.122",
                                                        "lessThanOrEqual": "6.1.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.6.68",
                                                        "lessThanOrEqual": "6.6.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.12.7",
                                                        "lessThanOrEqual": "6.12.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.13-rc4",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/0840d360a8909c722fb62459f42836afe32ededb",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/0840d360a8909c722fb62459f42836afe32ededb"
            },
            {
                "url": "https://git.kernel.org/stable/c/7ed4db315094963de0678a8adfd43c46471b9349",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/7ed4db315094963de0678a8adfd43c46471b9349"
            },
            {
                "url": "https://git.kernel.org/stable/c/3d2634ec0d1dbe8f4b511cf5261f327c6a76f4b6",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/3d2634ec0d1dbe8f4b511cf5261f327c6a76f4b6"
            },
            {
                "url": "https://git.kernel.org/stable/c/22b5c2acd65dbe949032f619d4758a35a82fffc3",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/22b5c2acd65dbe949032f619d4758a35a82fffc3"
            },
            {
                "url": "https://git.kernel.org/stable/c/9b42d1e8e4fe9dc631162c04caa69b0d1860b0f0",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/9b42d1e8e4fe9dc631162c04caa69b0d1860b0f0"
            }
        ]
    },
    "generator": {
        "engine": "bippy-5f407fcff5a0"
    }
}