{"id":"CVE-2024-55881","state":"PUBLISHED","title":"KVM: x86: Play nice with protected guests in complete_hypercall_exit()","description":"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 ]---","publishedAt":"2025-01-11T12:35:44.019Z","updatedAt":"2026-05-23T15:55:35.333Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5969e2435cbd7f0ce8c28d717bfc39987ee8d8f1","status":"affected","lessThan":"0840d360a8909c722fb62459f42836afe32ededb","versionType":"git"},{"version":"b5aead0064f33ae5e693a364e3204fe1c0ac9af2","status":"affected","lessThan":"7ed4db315094963de0678a8adfd43c46471b9349","versionType":"git"},{"version":"b5aead0064f33ae5e693a364e3204fe1c0ac9af2","status":"affected","lessThan":"3d2634ec0d1dbe8f4b511cf5261f327c6a76f4b6","versionType":"git"},{"version":"b5aead0064f33ae5e693a364e3204fe1c0ac9af2","status":"affected","lessThan":"22b5c2acd65dbe949032f619d4758a35a82fffc3","versionType":"git"},{"version":"b5aead0064f33ae5e693a364e3204fe1c0ac9af2","status":"affected","lessThan":"9b42d1e8e4fe9dc631162c04caa69b0d1860b0f0","versionType":"git"},{"version":"5.15.5","status":"affected","lessThan":"5.15.176","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/x86.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.16","versionType":"semver"},{"version":"5.15.176","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.122","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.68","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.7","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/x86.c"]}],"references":["https://git.kernel.org/stable/c/0840d360a8909c722fb62459f42836afe32ededb","https://git.kernel.org/stable/c/7ed4db315094963de0678a8adfd43c46471b9349","https://git.kernel.org/stable/c/3d2634ec0d1dbe8f4b511cf5261f327c6a76f4b6","https://git.kernel.org/stable/c/22b5c2acd65dbe949032f619d4758a35a82fffc3","https://git.kernel.org/stable/c/9b42d1e8e4fe9dc631162c04caa69b0d1860b0f0","https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:08:04.920Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/55xxx/CVE-2024-55881.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-55881","state":"PUBLISHED","datePublished":"2025-01-11T12:35:44.019Z","dateUpdated":"2026-05-23T15:55:35.333Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-01-09T09:51:32.450Z"},"containers":{"cna":{"title":"KVM: x86: Play nice with protected guests in complete_hypercall_exit()","descriptions":[{"lang":"en","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 ]---"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5969e2435cbd7f0ce8c28d717bfc39987ee8d8f1","status":"affected","lessThan":"0840d360a8909c722fb62459f42836afe32ededb","versionType":"git"},{"version":"b5aead0064f33ae5e693a364e3204fe1c0ac9af2","status":"affected","lessThan":"7ed4db315094963de0678a8adfd43c46471b9349","versionType":"git"},{"version":"b5aead0064f33ae5e693a364e3204fe1c0ac9af2","status":"affected","lessThan":"3d2634ec0d1dbe8f4b511cf5261f327c6a76f4b6","versionType":"git"},{"version":"b5aead0064f33ae5e693a364e3204fe1c0ac9af2","status":"affected","lessThan":"22b5c2acd65dbe949032f619d4758a35a82fffc3","versionType":"git"},{"version":"b5aead0064f33ae5e693a364e3204fe1c0ac9af2","status":"affected","lessThan":"9b42d1e8e4fe9dc631162c04caa69b0d1860b0f0","versionType":"git"},{"version":"5.15.5","status":"affected","lessThan":"5.15.176","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/x86.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.16","versionType":"semver"},{"version":"5.15.176","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.122","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.68","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.7","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/x86.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0840d360a8909c722fb62459f42836afe32ededb"},{"url":"https://git.kernel.org/stable/c/7ed4db315094963de0678a8adfd43c46471b9349"},{"url":"https://git.kernel.org/stable/c/3d2634ec0d1dbe8f4b511cf5261f327c6a76f4b6"},{"url":"https://git.kernel.org/stable/c/22b5c2acd65dbe949032f619d4758a35a82fffc3"},{"url":"https://git.kernel.org/stable/c/9b42d1e8e4fe9dc631162c04caa69b0d1860b0f0"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-23T15:55:35.333Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.5","versionEndExcluding":"5.15.176"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.122"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.6.68"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.12.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.13"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T20:48:49.526Z"}}]}}}