CVE-2024-53195

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-53195", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-11-19T17:17:25.014Z", "datePublished": "2024-12-27T13:49:37.514Z", "dateUpdated": "2026-11-05T20:31:22.916Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:20:11.823Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Get rid of userspace_irqchip_in_use\n\nImproper use of userspace_irqchip_in_use led to syzbot hitting the\nfollowing WARN_ON() in kvm_timer_update_irq():\n\nWARNING: CPU: 0 PID: 3281 at arch/arm64/kvm/arch_timer.c:459\nkvm_timer_update_irq+0x21c/0x394\nCall trace:\n kvm_timer_update_irq+0x21c/0x394 arch/arm64/kvm/arch_timer.c:459\n kvm_timer_vcpu_reset+0x158/0x684 arch/arm64/kvm/arch_timer.c:968\n kvm_reset_vcpu+0x3b4/0x560 arch/arm64/kvm/reset.c:264\n kvm_vcpu_set_target arch/arm64/kvm/arm.c:1553 [inline]\n kvm_arch_vcpu_ioctl_vcpu_init arch/arm64/kvm/arm.c:1573 [inline]\n kvm_arch_vcpu_ioctl+0x112c/0x1b3c arch/arm64/kvm/arm.c:1695\n kvm_vcpu_ioctl+0x4ec/0xf74 virt/kvm/kvm_main.c:4658\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl fs/ioctl.c:893 [inline]\n __arm64_sys_ioctl+0x108/0x184 fs/ioctl.c:893\n __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]\n invoke_syscall+0x78/0x1b8 arch/arm64/kernel/syscall.c:49\n el0_svc_common+0xe8/0x1b0 arch/arm64/kernel/syscall.c:132\n do_el0_svc+0x40/0x50 arch/arm64/kernel/syscall.c:151\n el0_svc+0x54/0x14c arch/arm64/kernel/entry-common.c:712\n el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730\n el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598\n\nThe following sequence led to the scenario:\n - Userspace creates a VM and a vCPU.\n - The vCPU is initialized with KVM_ARM_VCPU_PMU_V3 during\n KVM_ARM_VCPU_INIT.\n - Without any other setup, such as vGIC or vPMU, userspace issues\n KVM_RUN on the vCPU. Since the vPMU is requested, but not setup,\n kvm_arm_pmu_v3_enable() fails in kvm_arch_vcpu_run_pid_change().\n As a result, KVM_RUN returns after enabling the timer, but before\n incrementing 'userspace_irqchip_in_use':\n kvm_arch_vcpu_run_pid_change()\n ret = kvm_arm_pmu_v3_enable()\n if (!vcpu->arch.pmu.created)\n return -EINVAL;\n if (ret)\n return ret;\n [...]\n if (!irqchip_in_kernel(kvm))\n static_branch_inc(&userspace_irqchip_in_use);\n - Userspace ignores the error and issues KVM_ARM_VCPU_INIT again.\n Since the timer is already enabled, control moves through the\n following flow, ultimately hitting the WARN_ON():\n kvm_timer_vcpu_reset()\n if (timer->enabled)\n kvm_timer_update_irq()\n if (!userspace_irqchip())\n ret = kvm_vgic_inject_irq()\n ret = vgic_lazy_init()\n if (unlikely(!vgic_initialized(kvm)))\n if (kvm->arch.vgic.vgic_model !=\n KVM_DEV_TYPE_ARM_VGIC_V2)\n return -EBUSY;\n WARN_ON(ret);\n\nTheoretically, since userspace_irqchip_in_use's functionality can be\nsimply replaced by '!irqchip_in_kernel()', get rid of the static key\nto avoid the mismanagement, which also helps with the syzbot issue."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm64/include/asm/kvm_host.h", "arch/arm64/kvm/arch_timer.c", "arch/arm64/kvm/arm.c"], "versions": [{"version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "lessThan": "982a1461ab9cf3146302fe5a139ecb1f9b2d33fc", "status": "affected", "versionType": "git"}, {"version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "lessThan": "dd2f9861f27571d47998d71e7516bf7216db0b52", "status": "affected", "versionType": "git"}, {"version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "lessThan": "c16e2dba39ff6ae84bb8dc9c8e0fb21d9b2f6f5c", "status": "affected", "versionType": "git"}, {"version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "lessThan": "fe425d5239a28c21e0c83ee7a8f4cb210d29fdb4", "status": "affected", "versionType": "git"}, {"version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "lessThan": "38d7aacca09230fdb98a34194fec2af597e8e20d", "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/arm64/include/asm/kvm_host.h", "arch/arm64/kvm/arch_timer.c", "arch/arm64/kvm/arm.c"], "versions": [{"version": "3.11", "status": "affected"}, {"version": "0", "lessThan": "3.11", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.64", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11.11", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.2", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13", "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": "3.11", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.6.64"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.11.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.12.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/982a1461ab9cf3146302fe5a139ecb1f9b2d33fc"}, {"url": "https://git.kernel.org/stable/c/dd2f9861f27571d47998d71e7516bf7216db0b52"}, {"url": "https://git.kernel.org/stable/c/c16e2dba39ff6ae84bb8dc9c8e0fb21d9b2f6f5c"}, {"url": "https://git.kernel.org/stable/c/fe425d5239a28c21e0c83ee7a8f4cb210d29fdb4"}, {"url": "https://git.kernel.org/stable/c/38d7aacca09230fdb98a34194fec2af597e8e20d"}], "title": "KVM: arm64: Get rid of userspace_irqchip_in_use", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-53195", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-05T20:28:17.466515Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-05T20:31:22.916Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-53195", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-05T20:28:17.466515Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-05T20:28:18.809Z"}}], "cna": {"title": "KVM: arm64: Get rid of userspace_irqchip_in_use", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "lessThan": "982a1461ab9cf3146302fe5a139ecb1f9b2d33fc", "versionType": "git"}, {"status": "affected", "version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "lessThan": "dd2f9861f27571d47998d71e7516bf7216db0b52", "versionType": "git"}, {"status": "affected", "version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "lessThan": "c16e2dba39ff6ae84bb8dc9c8e0fb21d9b2f6f5c", "versionType": "git"}, {"status": "affected", "version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "lessThan": "fe425d5239a28c21e0c83ee7a8f4cb210d29fdb4", "versionType": "git"}, {"status": "affected", "version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "lessThan": "38d7aacca09230fdb98a34194fec2af597e8e20d", "versionType": "git"}], "programFiles": ["arch/arm64/include/asm/kvm_host.h", "arch/arm64/kvm/arch_timer.c", "arch/arm64/kvm/arm.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.11"}, {"status": "unaffected", "version": "0", "lessThan": "3.11", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.191", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.64", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.11.11", "versionType": "semver", "lessThanOrEqual": "6.11.*"}, {"status": "unaffected", "version": "6.12.2", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.13", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["arch/arm64/include/asm/kvm_host.h", "arch/arm64/kvm/arch_timer.c", "arch/arm64/kvm/arm.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/982a1461ab9cf3146302fe5a139ecb1f9b2d33fc"}, {"url": "https://git.kernel.org/stable/c/dd2f9861f27571d47998d71e7516bf7216db0b52"}, {"url": "https://git.kernel.org/stable/c/c16e2dba39ff6ae84bb8dc9c8e0fb21d9b2f6f5c"}, {"url": "https://git.kernel.org/stable/c/fe425d5239a28c21e0c83ee7a8f4cb210d29fdb4"}, {"url": "https://git.kernel.org/stable/c/38d7aacca09230fdb98a34194fec2af597e8e20d"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Get rid of userspace_irqchip_in_use\n\nImproper use of userspace_irqchip_in_use led to syzbot hitting the\nfollowing WARN_ON() in kvm_timer_update_irq():\n\nWARNING: CPU: 0 PID: 3281 at arch/arm64/kvm/arch_timer.c:459\nkvm_timer_update_irq+0x21c/0x394\nCall trace:\n kvm_timer_update_irq+0x21c/0x394 arch/arm64/kvm/arch_timer.c:459\n kvm_timer_vcpu_reset+0x158/0x684 arch/arm64/kvm/arch_timer.c:968\n kvm_reset_vcpu+0x3b4/0x560 arch/arm64/kvm/reset.c:264\n kvm_vcpu_set_target arch/arm64/kvm/arm.c:1553 [inline]\n kvm_arch_vcpu_ioctl_vcpu_init arch/arm64/kvm/arm.c:1573 [inline]\n kvm_arch_vcpu_ioctl+0x112c/0x1b3c arch/arm64/kvm/arm.c:1695\n kvm_vcpu_ioctl+0x4ec/0xf74 virt/kvm/kvm_main.c:4658\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl fs/ioctl.c:893 [inline]\n __arm64_sys_ioctl+0x108/0x184 fs/ioctl.c:893\n __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]\n invoke_syscall+0x78/0x1b8 arch/arm64/kernel/syscall.c:49\n el0_svc_common+0xe8/0x1b0 arch/arm64/kernel/syscall.c:132\n do_el0_svc+0x40/0x50 arch/arm64/kernel/syscall.c:151\n el0_svc+0x54/0x14c arch/arm64/kernel/entry-common.c:712\n el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730\n el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598\n\nThe following sequence led to the scenario:\n - Userspace creates a VM and a vCPU.\n - The vCPU is initialized with KVM_ARM_VCPU_PMU_V3 during\n KVM_ARM_VCPU_INIT.\n - Without any other setup, such as vGIC or vPMU, userspace issues\n KVM_RUN on the vCPU. Since the vPMU is requested, but not setup,\n kvm_arm_pmu_v3_enable() fails in kvm_arch_vcpu_run_pid_change().\n As a result, KVM_RUN returns after enabling the timer, but before\n incrementing 'userspace_irqchip_in_use':\n kvm_arch_vcpu_run_pid_change()\n ret = kvm_arm_pmu_v3_enable()\n if (!vcpu->arch.pmu.created)\n return -EINVAL;\n if (ret)\n return ret;\n [...]\n if (!irqchip_in_kernel(kvm))\n static_branch_inc(&userspace_irqchip_in_use);\n - Userspace ignores the error and issues KVM_ARM_VCPU_INIT again.\n Since the timer is already enabled, control moves through the\n following flow, ultimately hitting the WARN_ON():\n kvm_timer_vcpu_reset()\n if (timer->enabled)\n kvm_timer_update_irq()\n if (!userspace_irqchip())\n ret = kvm_vgic_inject_irq()\n ret = vgic_lazy_init()\n if (unlikely(!vgic_initialized(kvm)))\n if (kvm->arch.vgic.vgic_model !=\n KVM_DEV_TYPE_ARM_VGIC_V2)\n return -EBUSY;\n WARN_ON(ret);\n\nTheoretically, since userspace_irqchip_in_use's functionality can be\nsimply replaced by '!irqchip_in_kernel()', get rid of the static key\nto avoid the mismanagement, which also helps with the syzbot issue."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.191", "versionStartIncluding": "3.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.64", "versionStartIncluding": "3.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.11.11", "versionStartIncluding": "3.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.2", "versionStartIncluding": "3.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.13", "versionStartIncluding": "3.11"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:20:11.823Z"}}}, "cveMetadata": {"cveId": "CVE-2024-53195", "state": "PUBLISHED", "dateUpdated": "2026-11-05T20:31:22.916Z", "dateReserved": "2024-11-19T17:17:25.014Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-12-27T13:49:37.514Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/arm64/include/asm/kvm_host.h", "arch/arm64/kvm/arch_timer.c", "arch/arm64/kvm/arm.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "982a1461ab9cf3146302fe5a139ecb1f9b2d33fc", "status": "affected", "version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "versionType": "git"}, {"lessThan": "dd2f9861f27571d47998d71e7516bf7216db0b52", "status": "affected", "version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "versionType": "git"}, {"lessThan": "c16e2dba39ff6ae84bb8dc9c8e0fb21d9b2f6f5c", "status": "affected", "version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "versionType": "git"}, {"lessThan": "fe425d5239a28c21e0c83ee7a8f4cb210d29fdb4", "status": "affected", "version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "versionType": "git"}, {"lessThan": "38d7aacca09230fdb98a34194fec2af597e8e20d", "status": "affected", "version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/arm64/include/asm/kvm_host.h", "arch/arm64/kvm/arch_timer.c", "arch/arm64/kvm/arm.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.11"}, {"lessThan": "3.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.64", "versionType": "semver"}, {"lessThanOrEqual": "6.11.*", "status": "unaffected", "version": "6.11.11", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.2", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.13", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "523573B1-32B0-4CEF-A666-DC2DA3D85104", "versionEndExcluding": "6.6.64", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "21434379-192D-472F-9B54-D45E3650E893", "versionEndExcluding": "6.11.11", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D8882B1B-2ABC-4838-AC1D-DBDBB5764776", "versionEndExcluding": "6.12.2", "versionStartIncluding": "6.12", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Get rid of userspace_irqchip_in_use\n\nImproper use of userspace_irqchip_in_use led to syzbot hitting the\nfollowing WARN_ON() in kvm_timer_update_irq():\n\nWARNING: CPU: 0 PID: 3281 at arch/arm64/kvm/arch_timer.c:459\nkvm_timer_update_irq+0x21c/0x394\nCall trace:\n kvm_timer_update_irq+0x21c/0x394 arch/arm64/kvm/arch_timer.c:459\n kvm_timer_vcpu_reset+0x158/0x684 arch/arm64/kvm/arch_timer.c:968\n kvm_reset_vcpu+0x3b4/0x560 arch/arm64/kvm/reset.c:264\n kvm_vcpu_set_target arch/arm64/kvm/arm.c:1553 [inline]\n kvm_arch_vcpu_ioctl_vcpu_init arch/arm64/kvm/arm.c:1573 [inline]\n kvm_arch_vcpu_ioctl+0x112c/0x1b3c arch/arm64/kvm/arm.c:1695\n kvm_vcpu_ioctl+0x4ec/0xf74 virt/kvm/kvm_main.c:4658\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl fs/ioctl.c:893 [inline]\n __arm64_sys_ioctl+0x108/0x184 fs/ioctl.c:893\n __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]\n invoke_syscall+0x78/0x1b8 arch/arm64/kernel/syscall.c:49\n el0_svc_common+0xe8/0x1b0 arch/arm64/kernel/syscall.c:132\n do_el0_svc+0x40/0x50 arch/arm64/kernel/syscall.c:151\n el0_svc+0x54/0x14c arch/arm64/kernel/entry-common.c:712\n el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730\n el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598\n\nThe following sequence led to the scenario:\n - Userspace creates a VM and a vCPU.\n - The vCPU is initialized with KVM_ARM_VCPU_PMU_V3 during\n KVM_ARM_VCPU_INIT.\n - Without any other setup, such as vGIC or vPMU, userspace issues\n KVM_RUN on the vCPU. Since the vPMU is requested, but not setup,\n kvm_arm_pmu_v3_enable() fails in kvm_arch_vcpu_run_pid_change().\n As a result, KVM_RUN returns after enabling the timer, but before\n incrementing 'userspace_irqchip_in_use':\n kvm_arch_vcpu_run_pid_change()\n ret = kvm_arm_pmu_v3_enable()\n if (!vcpu->arch.pmu.created)\n return -EINVAL;\n if (ret)\n return ret;\n [...]\n if (!irqchip_in_kernel(kvm))\n static_branch_inc(&userspace_irqchip_in_use);\n - Userspace ignores the error and issues KVM_ARM_VCPU_INIT again.\n Since the timer is already enabled, control moves through the\n following flow, ultimately hitting the WARN_ON():\n kvm_timer_vcpu_reset()\n if (timer->enabled)\n kvm_timer_update_irq()\n if (!userspace_irqchip())\n ret = kvm_vgic_inject_irq()\n ret = vgic_lazy_init()\n if (unlikely(!vgic_initialized(kvm)))\n if (kvm->arch.vgic.vgic_model !=\n KVM_DEV_TYPE_ARM_VGIC_V2)\n return -EBUSY;\n WARN_ON(ret);\n\nTheoretically, since userspace_irqchip_in_use's functionality can be\nsimply replaced by '!irqchip_in_kernel()', get rid of the static key\nto avoid the mismanagement, which also helps with the syzbot issue."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: arm64: deshacerse de userspace_irqchip_in_use El uso inadecuado de userspace_irqchip_in_use provoc\u00f3 que syzbot ejecutara el siguiente WARN_ON() en kvm_timer_update_irq(): ADVERTENCIA: CPU: 0 PID: 3281 en arch/arm64/kvm/arch_timer.c:459 kvm_timer_update_irq+0x21c/0x394 Rastreo de llamadas: kvm_timer_update_irq+0x21c/0x394 arch/arm64/kvm/arch_timer.c:459 kvm_timer_vcpu_reset+0x158/0x684 arch/arm64/kvm/arch_timer.c:968 kvm_reset_vcpu+0x3b4/0x560 arch/arm64/kvm/reset.c:264 kvm_vcpu_set_target arch/arm64/kvm/arm.c:1553 [en l\u00ednea] kvm_arch_vcpu_ioctl_vcpu_init arch/arm64/kvm/arm.c:1573 [en l\u00ednea] kvm_arch_vcpu_ioctl+0x112c/0x1b3c arch/arm64/kvm/arm.c:1695 kvm_vcpu_ioctl+0x4ec/0xf74 virt/kvm/kvm_main.c:4658 vfs_ioctl fs/ioctl.c:51 [en l\u00ednea] __do_sys_ioctl fs/ioctl.c:907 [en l\u00ednea] __se_sys_ioctl fs/ioctl.c:893 [en l\u00ednea] __arm64_sys_ioctl+0x108/0x184 fs/ioctl.c:893 __invoke_syscall arch/arm64/kernel/syscall.c:35 [en l\u00ednea] anybody_syscall+0x78/0x1b8 another_syscall arch/arm64/kernel/syscall.c:49 another_svc_common+0xe8/0x1b0 another_syscall arch/arm64/kernel/syscall.c:132 another_svc+0x40/0x50 another_syscall arch/arm64/kernel/syscall.c:151 another_svc+0x54/0x14c arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 La siguiente secuencia condujo al escenario: - El espacio de usuario crea una VM y una vCPU. - La vCPU se inicializa con KVM_ARM_VCPU_PMU_V3 durante KVM_ARM_VCPU_INIT. - Sin ninguna otra configuraci\u00f3n, como vGIC o vPMU, el espacio de usuario emite KVM_RUN en la vCPU. Dado que se solicita la vPMU, pero no se configura, kvm_arm_pmu_v3_enable() falla en kvm_arch_vcpu_run_pid_change(). Como resultado, KVM_RUN regresa despu\u00e9s de habilitar el temporizador, pero antes de incrementar 'userspace_irqchip_in_use': kvm_arch_vcpu_run_pid_change() ret = kvm_arm_pmu_v3_enable() if (!vcpu->arch.pmu.created) return -EINVAL; if (ret) return ret; [...] if (!irqchip_in_kernel(kvm)) static_branch_inc(&userspace_irqchip_in_use); - Userspace ignora el error y emite KVM_ARM_VCPU_INIT nuevamente. Como el temporizador ya est\u00e1 habilitado, el control se mueve a trav\u00e9s del siguiente flujo, y finalmente llega a WARN_ON(): kvm_timer_vcpu_reset() if (timer->enabled) kvm_timer_update_irq() if (!userspace_irqchip()) ret = kvm_vgic_inject_irq() ret = vgic_lazy_init() if (unlikely(!vgic_initialized(kvm))) if (kvm->arch.vgic.vgic_model != KVM_DEV_TYPE_ARM_VGIC_V2) return -EBUSY; WARN_ON(ret); Te\u00f3ricamente, dado que la funcionalidad de userspace_irqchip_in_use se puede reemplazar simplemente por '!irqchip_in_kernel()', desh\u00e1gase de la clave est\u00e1tica para evitar la mala administraci\u00f3n, lo que tambi\u00e9n ayuda con el problema de syzbot."}], "id": "CVE-2024-53195", "lastModified": "2026-11-05T21:17:34.283", "metrics": {"cvssMetricV31": [{"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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-53195", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T20:28:17.466515Z", "version": "2.0.3"}}]}, "published": "2024-12-27T14:15:27.137", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/38d7aacca09230fdb98a34194fec2af597e8e20d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/982a1461ab9cf3146302fe5a139ecb1f9b2d33fc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c16e2dba39ff6ae84bb8dc9c8e0fb21d9b2f6f5c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dd2f9861f27571d47998d71e7516bf7216db0b52"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fe425d5239a28c21e0c83ee7a8f4cb210d29fdb4"}], "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: arm64: Get rid of userspace_irqchip_in_use", "id": "2334383", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2334383"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-672", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nKVM: arm64: Get rid of userspace_irqchip_in_use\nImproper use of userspace_irqchip_in_use led to syzbot hitting the\nfollowing WARN_ON() in kvm_timer_update_irq():\nWARNING: CPU: 0 PID: 3281 at arch/arm64/kvm/arch_timer.c:459\nkvm_timer_update_irq+0x21c/0x394\nCall trace:\nkvm_timer_update_irq+0x21c/0x394 arch/arm64/kvm/arch_timer.c:459\nkvm_timer_vcpu_reset+0x158/0x684 arch/arm64/kvm/arch_timer.c:968\nkvm_reset_vcpu+0x3b4/0x560 arch/arm64/kvm/reset.c:264\nkvm_vcpu_set_target arch/arm64/kvm/arm.c:1553 [inline]\nkvm_arch_vcpu_ioctl_vcpu_init arch/arm64/kvm/arm.c:1573 [inline]\nkvm_arch_vcpu_ioctl+0x112c/0x1b3c arch/arm64/kvm/arm.c:1695\nkvm_vcpu_ioctl+0x4ec/0xf74 virt/kvm/kvm_main.c:4658\nvfs_ioctl fs/ioctl.c:51 [inline]\n__do_sys_ioctl fs/ioctl.c:907 [inline]\n__se_sys_ioctl fs/ioctl.c:893 [inline]\n__arm64_sys_ioctl+0x108/0x184 fs/ioctl.c:893\n__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]\ninvoke_syscall+0x78/0x1b8 arch/arm64/kernel/syscall.c:49\nel0_svc_common+0xe8/0x1b0 arch/arm64/kernel/syscall.c:132\ndo_el0_svc+0x40/0x50 arch/arm64/kernel/syscall.c:151\nel0_svc+0x54/0x14c arch/arm64/kernel/entry-common.c:712\nel0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730\nel0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598\nThe following sequence led to the scenario:\n- Userspace creates a VM and a vCPU.\n- The vCPU is initialized with KVM_ARM_VCPU_PMU_V3 during\nKVM_ARM_VCPU_INIT.\n- Without any other setup, such as vGIC or vPMU, userspace issues\nKVM_RUN on the vCPU. Since the vPMU is requested, but not setup,\nkvm_arm_pmu_v3_enable() fails in kvm_arch_vcpu_run_pid_change().\nAs a result, KVM_RUN returns after enabling the timer, but before\nincrementing 'userspace_irqchip_in_use':\nkvm_arch_vcpu_run_pid_change()\nret = kvm_arm_pmu_v3_enable()\nif (!vcpu->arch.pmu.created)\nreturn -EINVAL;\nif (ret)\nreturn ret;\n[...]\nif (!irqchip_in_kernel(kvm))\nstatic_branch_inc(&userspace_irqchip_in_use);\n- Userspace ignores the error and issues KVM_ARM_VCPU_INIT again.\nSince the timer is already enabled, control moves through the\nfollowing flow, ultimately hitting the WARN_ON():\nkvm_timer_vcpu_reset()\nif (timer->enabled)\nkvm_timer_update_irq()\nif (!userspace_irqchip())\nret = kvm_vgic_inject_irq()\nret = vgic_lazy_init()\nif (unlikely(!vgic_initialized(kvm)))\nif (kvm->arch.vgic.vgic_model !=\nKVM_DEV_TYPE_ARM_VGIC_V2)\nreturn -EBUSY;\nWARN_ON(ret);\nTheoretically, since userspace_irqchip_in_use's functionality can be\nsimply replaced by '!irqchip_in_kernel()', get rid of the static key\nto avoid the mismanagement, which also helps with the syzbot issue."], "name": "CVE-2024-53195", "package_state": [{"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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "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": "2024-12-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-53195\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-53195\nhttps://lore.kernel.org/linux-cve-announce/2024122724-CVE-2024-53195-772a@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-12T22:23:15.118287+00:00", "updated": "2025-07-12T22:23:15.118336+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}