309 lines
18 KiB
JSON
309 lines
18 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2021-47341",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-05-21T14:28:16.979Z",
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"datePublished": "2024-05-21T14:35:49.001Z",
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"dateUpdated": "2026-08-05T08:47:18.943Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:47:18.943Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: mmio: Fix use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio\n\nBUG: KASAN: use-after-free in kvm_vm_ioctl_unregister_coalesced_mmio+0x7c/0x1ec arch/arm64/kvm/../../../virt/kvm/coalesced_mmio.c:183\nRead of size 8 at addr ffff0000c03a2500 by task syz-executor083/4269\n\nCPU: 5 PID: 4269 Comm: syz-executor083 Not tainted 5.10.0 #7\nHardware name: linux,dummy-virt (DT)\nCall trace:\n dump_backtrace+0x0/0x2d0 arch/arm64/kernel/stacktrace.c:132\n show_stack+0x28/0x34 arch/arm64/kernel/stacktrace.c:196\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack+0x110/0x164 lib/dump_stack.c:118\n print_address_description+0x78/0x5c8 mm/kasan/report.c:385\n __kasan_report mm/kasan/report.c:545 [inline]\n kasan_report+0x148/0x1e4 mm/kasan/report.c:562\n check_memory_region_inline mm/kasan/generic.c:183 [inline]\n __asan_load8+0xb4/0xbc mm/kasan/generic.c:252\n kvm_vm_ioctl_unregister_coalesced_mmio+0x7c/0x1ec arch/arm64/kvm/../../../virt/kvm/coalesced_mmio.c:183\n kvm_vm_ioctl+0xe30/0x14c4 arch/arm64/kvm/../../../virt/kvm/kvm_main.c:3755\n vfs_ioctl fs/ioctl.c:48 [inline]\n __do_sys_ioctl fs/ioctl.c:753 [inline]\n __se_sys_ioctl fs/ioctl.c:739 [inline]\n __arm64_sys_ioctl+0xf88/0x131c fs/ioctl.c:739\n __invoke_syscall arch/arm64/kernel/syscall.c:36 [inline]\n invoke_syscall arch/arm64/kernel/syscall.c:48 [inline]\n el0_svc_common arch/arm64/kernel/syscall.c:158 [inline]\n do_el0_svc+0x120/0x290 arch/arm64/kernel/syscall.c:220\n el0_svc+0x1c/0x28 arch/arm64/kernel/entry-common.c:367\n el0_sync_handler+0x98/0x170 arch/arm64/kernel/entry-common.c:383\n el0_sync+0x140/0x180 arch/arm64/kernel/entry.S:670\n\nAllocated by task 4269:\n stack_trace_save+0x80/0xb8 kernel/stacktrace.c:121\n kasan_save_stack mm/kasan/common.c:48 [inline]\n kasan_set_track mm/kasan/common.c:56 [inline]\n __kasan_kmalloc+0xdc/0x120 mm/kasan/common.c:461\n kasan_kmalloc+0xc/0x14 mm/kasan/common.c:475\n kmem_cache_alloc_trace include/linux/slab.h:450 [inline]\n kmalloc include/linux/slab.h:552 [inline]\n kzalloc include/linux/slab.h:664 [inline]\n kvm_vm_ioctl_register_coalesced_mmio+0x78/0x1cc arch/arm64/kvm/../../../virt/kvm/coalesced_mmio.c:146\n kvm_vm_ioctl+0x7e8/0x14c4 arch/arm64/kvm/../../../virt/kvm/kvm_main.c:3746\n vfs_ioctl fs/ioctl.c:48 [inline]\n __do_sys_ioctl fs/ioctl.c:753 [inline]\n __se_sys_ioctl fs/ioctl.c:739 [inline]\n __arm64_sys_ioctl+0xf88/0x131c fs/ioctl.c:739\n __invoke_syscall arch/arm64/kernel/syscall.c:36 [inline]\n invoke_syscall arch/arm64/kernel/syscall.c:48 [inline]\n el0_svc_common arch/arm64/kernel/syscall.c:158 [inline]\n do_el0_svc+0x120/0x290 arch/arm64/kernel/syscall.c:220\n el0_svc+0x1c/0x28 arch/arm64/kernel/entry-common.c:367\n el0_sync_handler+0x98/0x170 arch/arm64/kernel/entry-common.c:383\n el0_sync+0x140/0x180 arch/arm64/kernel/entry.S:670\n\nFreed by task 4269:\n stack_trace_save+0x80/0xb8 kernel/stacktrace.c:121\n kasan_save_stack mm/kasan/common.c:48 [inline]\n kasan_set_track+0x38/0x6c mm/kasan/common.c:56\n kasan_set_free_info+0x20/0x40 mm/kasan/generic.c:355\n __kasan_slab_free+0x124/0x150 mm/kasan/common.c:422\n kasan_slab_free+0x10/0x1c mm/kasan/common.c:431\n slab_free_hook mm/slub.c:1544 [inline]\n slab_free_freelist_hook mm/slub.c:1577 [inline]\n slab_free mm/slub.c:3142 [inline]\n kfree+0x104/0x38c mm/slub.c:4124\n coalesced_mmio_destructor+0x94/0xa4 arch/arm64/kvm/../../../virt/kvm/coalesced_mmio.c:102\n kvm_iodevice_destructor include/kvm/iodev.h:61 [inline]\n kvm_io_bus_unregister_dev+0x248/0x280 arch/arm64/kvm/../../../virt/kvm/kvm_main.c:4374\n kvm_vm_ioctl_unregister_coalesced_mmio+0x158/0x1ec arch/arm64/kvm/../../../virt/kvm/coalesced_mmio.c:186\n kvm_vm_ioctl+0xe30/0x14c4 arch/arm64/kvm/../../../virt/kvm/kvm_main.c:3755\n vfs_ioctl fs/ioctl.c:48 [inline]\n __do_sys_ioctl fs/ioctl.c:753 [inline]\n __se_sys_ioctl fs/ioctl.c:739 [inline]\n __arm64_sys_ioctl+0xf88/0x131c fs/ioctl.c:739\n __invoke_syscall arch/arm64/kernel/syscall.c:36 [inline]\n invoke_syscall arch/arm64/kernel/sys\n---truncated---"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - Reachable only via local host ioctls on /dev/kvm (KVM_CREATE_VM then KVM_REGISTER/UNREGISTER_COALESCED_MMIO through kvm_vm_ioctl); not via network packets or unaided guest MMIO.\nAC:L - The attacker fully controls zone registration/unregistration and can reliably force the GFP_KERNEL_ACCOUNT kmalloc failure in kvm_io_bus_unregister_dev (e.g. memcg/memory pressure) that triggers the UAF path.\nPR:L - The ioctl path has no capable() check; access needs only /dev/kvm permissions (kvm group or seat uaccess), which is unprivileged device access rather than init-namespace root.\nUI:N - The attacker triggers the bug directly with their own KVM ioctls; no separate victim action is required.\nS:U - This is host userspace (VMM) corrupting host kernel state via the KVM ioctl interface, not a guest-to-host escape across a VM security boundary.\nC:H - KASAN-confirmed use-after-free of kvm_coalesced_mmio_dev heap objects; freed objects can be reallocated/sprayed to obtain arbitrary kernel memory disclosure.\nI:H - UAF/double-free of IO-bus device objects enables heap corruption and write primitives that can hijack kernel control flow.\nA:H - Dereferencing freed coalesced-MMIO list/device objects causes kernel oops/panic, and UAF paths remain crashable even without full exploitation."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"virt/kvm/coalesced_mmio.c"
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],
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"versions": [
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{
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"version": "7d1bc32d6477ff96a32695ea4be8144e4513ab2d",
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"lessThan": "f2ff9d03432fcb160e9f7d4be26174d89de2779a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "2a20592baff59c5351c5200ec667e1a2aa22af85",
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"lessThan": "679837dc0abaa2c6e2a7bcd86483e05eee1d5066",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "50cbad42bfea8c052b7ca590bd4126cdc898713c",
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"lessThan": "8d7c539316d652d217e5e82b89ee204c812a7061",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5d3c4c79384af06e3c8e25b7770b6247496b4417",
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"lessThan": "069d44a24c0ff8f85adf49233aae7a8ca16f5c7e",
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"status": "affected",
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"version": "5d3c4c79384af06e3c8e25b7770b6247496b4417",
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"lessThan": "23fa2e46a5556f787ce2ea1a315d3ab93cced204",
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"status": "affected",
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},
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{
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"version": "168e82f640ed1891a700bdb43e37da354b2ab63c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5.4.119",
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"lessThan": "5.4.134",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.10.37",
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"lessThan": "5.10.52",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.12.4",
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"lessThan": "5.12.19",
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"status": "affected",
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},
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{
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"version": "5.11.21",
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"lessThan": "5.12",
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"virt/kvm/coalesced_mmio.c"
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],
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"versions": [
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{
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"version": "5.13",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.13",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.4.134",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.52",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.12.19",
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"lessThanOrEqual": "5.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.13.4",
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"lessThanOrEqual": "5.13.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.14",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.4.119",
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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{
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"references": [
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"url": "https://git.kernel.org/stable/c/f2ff9d03432fcb160e9f7d4be26174d89de2779a"
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},
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{
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"url": "https://git.kernel.org/stable/c/679837dc0abaa2c6e2a7bcd86483e05eee1d5066"
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},
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{
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"url": "https://git.kernel.org/stable/c/8d7c539316d652d217e5e82b89ee204c812a7061"
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},
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{
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"url": "https://git.kernel.org/stable/c/069d44a24c0ff8f85adf49233aae7a8ca16f5c7e"
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},
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{
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"url": "https://git.kernel.org/stable/c/23fa2e46a5556f787ce2ea1a315d3ab93cced204"
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}
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],
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"title": "KVM: mmio: Fix use-after-free Read in kvm_vm_ioctl_unregister_coalesced_mmio",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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"adp": [
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{
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2024-08-04T05:32:08.601Z"
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},
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/f2ff9d03432fcb160e9f7d4be26174d89de2779a",
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"url": "https://git.kernel.org/stable/c/679837dc0abaa2c6e2a7bcd86483e05eee1d5066",
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"url": "https://git.kernel.org/stable/c/8d7c539316d652d217e5e82b89ee204c812a7061",
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"tags": [
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},
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{
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"url": "https://git.kernel.org/stable/c/069d44a24c0ff8f85adf49233aae7a8ca16f5c7e",
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"url": "https://git.kernel.org/stable/c/23fa2e46a5556f787ce2ea1a315d3ab93cced204",
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]
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},
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2021-47341",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2024-09-10T15:38:50.302115Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2024-09-11T17:33:49.116Z"
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}
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}
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]
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}
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} |