GHSA-H4P6-VXWP-4W5Q
Vulnerability from github – Published: 2025-01-11 15:30 – Updated: 2025-11-03 21:32In the Linux kernel, the following vulnerability has been resolved:
KVM: x86: Play nice with protected guests in complete_hypercall_exit()
Use is_64_bit_hypercall() instead of is_64_bit_mode() to detect a 64-bit hypercall when completing said hypercall. For guests with protected state, e.g. SEV-ES and SEV-SNP, KVM must assume the hypercall was made in 64-bit mode as the vCPU state needed to detect 64-bit mode is unavailable.
Hacking the sev_smoke_test selftest to generate a KVM_HC_MAP_GPA_RANGE hypercall via VMGEXIT trips the WARN:
------------[ cut here ]------------ WARNING: CPU: 273 PID: 326626 at arch/x86/kvm/x86.h:180 complete_hypercall_exit+0x44/0xe0 [kvm] Modules linked in: kvm_amd kvm ... [last unloaded: kvm] CPU: 273 UID: 0 PID: 326626 Comm: sev_smoke_test Not tainted 6.12.0-smp--392e932fa0f3-feat #470 Hardware name: Google Astoria/astoria, BIOS 0.20240617.0-0 06/17/2024 RIP: 0010:complete_hypercall_exit+0x44/0xe0 [kvm] Call Trace: kvm_arch_vcpu_ioctl_run+0x2400/0x2720 [kvm] kvm_vcpu_ioctl+0x54f/0x630 [kvm] __se_sys_ioctl+0x6b/0xc0 do_syscall_64+0x83/0x160 entry_SYSCALL_64_after_hwframe+0x76/0x7e ---[ end trace 0000000000000000 ]---
{
"affected": [],
"aliases": [
"CVE-2024-55881"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-01-11T13:15:28Z",
"severity": "MODERATE"
},
"details": "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 \u003cTASK\u003e\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 \u003c/TASK\u003e\n ---[ end trace 0000000000000000 ]---",
"id": "GHSA-h4p6-vxwp-4w5q",
"modified": "2025-11-03T21:32:07Z",
"published": "2025-01-11T15:30:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-55881"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0840d360a8909c722fb62459f42836afe32ededb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/22b5c2acd65dbe949032f619d4758a35a82fffc3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3d2634ec0d1dbe8f4b511cf5261f327c6a76f4b6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7ed4db315094963de0678a8adfd43c46471b9349"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9b42d1e8e4fe9dc631162c04caa69b0d1860b0f0"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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