CVE-2022-50227

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-50227", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-06-18T10:57:27.432Z", "datePublished": "2025-06-18T11:03:59.885Z", "dateUpdated": "2026-08-05T08:57:47.222Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:57:47.222Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86/xen: Initialize Xen timer only once\n\nAdd a check for existing xen timers before initializing a new one.\n\nCurrently kvm_xen_init_timer() is called on every\nKVM_XEN_VCPU_ATTR_TYPE_TIMER, which is causing the following ODEBUG\ncrash when vcpu->arch.xen.timer is already set.\n\nODEBUG: init active (active state 0)\nobject type: hrtimer hint: xen_timer_callbac0\nRIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:502\nCall Trace:\n__debug_object_init\ndebug_hrtimer_init\ndebug_init\nhrtimer_init\nkvm_xen_init_timer\nkvm_xen_vcpu_set_attr\nkvm_arch_vcpu_ioctl\nkvm_vcpu_ioctl\nvfs_ioctl"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Triggered only via the host KVM_XEN_VCPU_SET_ATTR vCPU ioctl on /dev/kvm; guest Xen timer hypercalls call kvm_xen_start_timer but never kvm_xen_init_timer, so this is not remotely reachable.\nAC:L - An attacker with a vCPU fd can reliably reproduce by issuing KVM_XEN_VCPU_ATTR_TYPE_TIMER twice with a non-zero port and expires_ns, fully controlling both the initial arming and the re-init; no race or external condition is required.\nPR:L - Reachable by any unprivileged local user who can open /dev/kvm (typically kvm-group membership), create a VM/vCPU, and issue the ioctl; no CAP_SYS_ADMIN or init-namespace root is required.\nUI:N - Exploitation is entirely attacker-driven through ioctl calls; no victim action is needed.\nS:U - This is host userspace (VMM) corrupting the host kernel timer subsystem, not a guest-to-host escape; impact stays within the host kernel authority.\nC:H - Without DEBUG_OBJECTS, hrtimer_init memset()s an still-enqueued hrtimer, corrupting the timerqueue rbtree and enabling use-after-free primitives that can yield arbitrary kernel reads.\nI:H - The same timer-queue corruption provides a write/UAF primitive against kernel timer structures, which can be leveraged for control-flow hijacking or arbitrary writes.\nA:H - Re-init of an active hrtimer causes kernel WARN/oops under debugobjects and timer-subsystem crashes or hangs on production kernels when the corrupted rbtree is walked."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/kvm/xen.c"], "versions": [{"version": "536395260582be7443b0b35b0bbb89ffe3947f62", "lessThan": "9a9b5771e930f408c3419799000f76a9abaf2278", "status": "affected", "versionType": "git"}, {"version": "536395260582be7443b0b35b0bbb89ffe3947f62", "lessThan": "af735db31285fa699384c649be72a9f32ecbb665", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/kvm/xen.c"], "versions": [{"version": "5.19", "status": "affected"}, {"version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver"}, {"version": "5.19.2", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "5.19.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9a9b5771e930f408c3419799000f76a9abaf2278"}, {"url": "https://git.kernel.org/stable/c/af735db31285fa699384c649be72a9f32ecbb665"}], "title": "KVM: x86/xen: Initialize Xen timer only once", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/x86/kvm/xen.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "9a9b5771e930f408c3419799000f76a9abaf2278", "status": "affected", "version": "536395260582be7443b0b35b0bbb89ffe3947f62", "versionType": "git"}, {"lessThan": "af735db31285fa699384c649be72a9f32ecbb665", "status": "affected", "version": "536395260582be7443b0b35b0bbb89ffe3947f62", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/x86/kvm/xen.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.19"}, {"lessThan": "5.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.19.*", "status": "unaffected", "version": "5.19.2", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A1A2A5A5-4598-4D7E-BA07-4660398D6C8F", "versionEndExcluding": "5.19.2", "versionStartIncluding": "5.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86/xen: Initialize Xen timer only once\n\nAdd a check for existing xen timers before initializing a new one.\n\nCurrently kvm_xen_init_timer() is called on every\nKVM_XEN_VCPU_ATTR_TYPE_TIMER, which is causing the following ODEBUG\ncrash when vcpu->arch.xen.timer is already set.\n\nODEBUG: init active (active state 0)\nobject type: hrtimer hint: xen_timer_callbac0\nRIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:502\nCall Trace:\n__debug_object_init\ndebug_hrtimer_init\ndebug_init\nhrtimer_init\nkvm_xen_init_timer\nkvm_xen_vcpu_set_attr\nkvm_arch_vcpu_ioctl\nkvm_vcpu_ioctl\nvfs_ioctl"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: x86/xen: Inicializar el temporizador Xen solo una vez. Se ha a\u00f1adido una comprobaci\u00f3n de los temporizadores Xen existentes antes de inicializar uno nuevo. Actualmente, se llama a kvm_xen_init_timer() en cada KVM_XEN_VCPU_ATTR_TYPE_TIMER, lo que provoca el siguiente fallo de ODEBUG cuando vcpu->arch.xen.timer ya est\u00e1 configurado. ODEBUG: init activo (estado activo 0) tipo de objeto: hrtimer sugerencia: xen_timer_callbac0 RIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:502 Seguimiento de llamadas: __debug_object_init debug_hrtimer_init debug_init hrtimer_init kvm_xen_init_timer kvm_xen_vcpu_set_attr kvm_arch_vcpu_ioctl kvm_vcpu_ioctl vfs_ioctl"}], "id": "CVE-2022-50227", "lastModified": "2026-08-04T10:18:07.817", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-06-18T11:15:53.743", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9a9b5771e930f408c3419799000f76a9abaf2278"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/af735db31285fa699384c649be72a9f32ecbb665"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: KVM: x86/xen: Initialize Xen timer only once", "id": "2373504", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373504"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nKVM: x86/xen: Initialize Xen timer only once\nAdd a check for existing xen timers before initializing a new one.\nCurrently kvm_xen_init_timer() is called on every\nKVM_XEN_VCPU_ATTR_TYPE_TIMER, which is causing the following ODEBUG\ncrash when vcpu->arch.xen.timer is already set.\nODEBUG: init active (active state 0)\nobject type: hrtimer hint: xen_timer_callbac0\nRIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:502\nCall Trace:\n__debug_object_init\ndebug_hrtimer_init\ndebug_init\nhrtimer_init\nkvm_xen_init_timer\nkvm_xen_vcpu_set_attr\nkvm_arch_vcpu_ioctl\nkvm_vcpu_ioctl\nvfs_ioctl"], "name": "CVE-2022-50227", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-06-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-50227\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-50227\nhttps://lore.kernel.org/linux-cve-announce/2025061849-CVE-2022-50227-890e@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-06-23T08:36:33.788818+00:00", "updated": "2025-06-23T08:36:33.788867+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}