{ "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": "2026-05-11T20:52:40.934Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:52:40.934Z" }, "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": "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": "6.6.64", "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": "6.6.64" }, { "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/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" } } } }