221 lines
12 KiB
JSON
221 lines
12 KiB
JSON
{
|
||
"dataType": "CVE_RECORD",
|
||
"dataVersion": "5.2",
|
||
"cveMetadata": {
|
||
"cveId": "CVE-2021-47390",
|
||
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
||
"state": "PUBLISHED",
|
||
"assignerShortName": "Linux",
|
||
"dateReserved": "2024-05-21T14:58:30.813Z",
|
||
"datePublished": "2024-05-21T15:03:48.883Z",
|
||
"dateUpdated": "2026-08-05T08:47:35.643Z"
|
||
},
|
||
"containers": {
|
||
"cna": {
|
||
"providerMetadata": {
|
||
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
||
"shortName": "Linux",
|
||
"dateUpdated": "2026-08-05T08:47:35.643Z"
|
||
},
|
||
"descriptions": [
|
||
{
|
||
"lang": "en",
|
||
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Fix stack-out-of-bounds memory access from ioapic_write_indirect()\n\nKASAN reports the following issue:\n\n BUG: KASAN: stack-out-of-bounds in kvm_make_vcpus_request_mask+0x174/0x440 [kvm]\n Read of size 8 at addr ffffc9001364f638 by task qemu-kvm/4798\n\n CPU: 0 PID: 4798 Comm: qemu-kvm Tainted: G X --------- ---\n Hardware name: AMD Corporation DAYTONA_X/DAYTONA_X, BIOS RYM0081C 07/13/2020\n Call Trace:\n dump_stack+0xa5/0xe6\n print_address_description.constprop.0+0x18/0x130\n ? kvm_make_vcpus_request_mask+0x174/0x440 [kvm]\n __kasan_report.cold+0x7f/0x114\n ? kvm_make_vcpus_request_mask+0x174/0x440 [kvm]\n kasan_report+0x38/0x50\n kasan_check_range+0xf5/0x1d0\n kvm_make_vcpus_request_mask+0x174/0x440 [kvm]\n kvm_make_scan_ioapic_request_mask+0x84/0xc0 [kvm]\n ? kvm_arch_exit+0x110/0x110 [kvm]\n ? sched_clock+0x5/0x10\n ioapic_write_indirect+0x59f/0x9e0 [kvm]\n ? static_obj+0xc0/0xc0\n ? __lock_acquired+0x1d2/0x8c0\n ? kvm_ioapic_eoi_inject_work+0x120/0x120 [kvm]\n\nThe problem appears to be that 'vcpu_bitmap' is allocated as a single long\non stack and it should really be KVM_MAX_VCPUS long. We also seem to clear\nthe lower 16 bits of it with bitmap_zero() for no particular reason (my\nguess would be that 'bitmap' and 'vcpu_bitmap' variables in\nkvm_bitmap_or_dest_vcpus() caused the confusion: while the later is indeed\n16-bit long, the later should accommodate all possible vCPUs)."
|
||
}
|
||
],
|
||
"metrics": [
|
||
{
|
||
"cvssV3_1": {
|
||
"version": "3.1",
|
||
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
|
||
"baseScore": 8.8,
|
||
"baseSeverity": "HIGH"
|
||
},
|
||
"scenarios": [
|
||
{
|
||
"lang": "en",
|
||
"value": "AV:L - The bug is reached when a guest writes the in-kernel IOAPIC MMIO window (0xfec00000), causing a KVM MMIO exit into ioapic_mmio_write → ioapic_write_indirect on the host; this is a local hypervisor/guest interface, not a network protocol path.\nAC:L - A guest (or VMM user who creates the VM) can reliably trigger the path by writing an IOAPIC redirect entry with FIXED delivery mode; the undersized bitmap is always over-read, and with ≥65 vCPUs the attacker-controlled dest can also force out-of-bounds __set_bit writes with no race or uncontrolled condition.\nPR:L - Exploitation needs only the ability to run a KVM guest that uses the in-kernel irqchip—typically an unprivileged kvm-group user on /dev/kvm, or a cloud tenant controlling their guest OS—not real host root/CAP_SYS_ADMIN.\nUI:N - No victim action is required; the attacker triggers the vulnerable IOAPIC write path directly from guest code or their own VMM once the VM exists.\nS:C - A malicious guest corrupts host-kernel stack memory in KVM’s IOAPIC emulation, crossing the guest/host security boundary and enabling a potential VM escape affecting the host and other tenants.\nC:H - kvm_make_vcpus_request_mask performs a stack out-of-bounds read of the undersized vcpu_bitmap across KVM_MAX_VCPUS bits (~128 bytes), and stack corruption from the related OOB write can be leveraged for further host memory disclosure.\nI:H - kvm_bitmap_or_dest_vcpus uses __set_bit() on vcpu_idx values that can exceed the single unsigned long (bits ≥64), writing past the stack allocation toward higher stack addresses and enabling host memory corruption / control-flow hijacking.\nA:H - The out-of-bounds stack access can oops/panic the host kernel (as shown by the KASAN report in qemu-kvm), so availability impact on the host is high."
|
||
}
|
||
]
|
||
}
|
||
],
|
||
"affected": [
|
||
{
|
||
"product": "Linux",
|
||
"vendor": "Linux",
|
||
"defaultStatus": "unaffected",
|
||
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
||
"programFiles": [
|
||
"arch/x86/kvm/ioapic.c"
|
||
],
|
||
"versions": [
|
||
{
|
||
"version": "7ee30bc132c683d06a6d9e360e39e483e3990708",
|
||
"lessThan": "bebabb76ad9acca8858e0371e102fb60d708e25b",
|
||
"status": "affected",
|
||
"versionType": "git"
|
||
},
|
||
{
|
||
"version": "7ee30bc132c683d06a6d9e360e39e483e3990708",
|
||
"lessThan": "99a9e9b80f19fc63be005a33d76211dd23114792",
|
||
"status": "affected",
|
||
"versionType": "git"
|
||
},
|
||
{
|
||
"version": "7ee30bc132c683d06a6d9e360e39e483e3990708",
|
||
"lessThan": "2f9b68f57c6278c322793a06063181deded0ad69",
|
||
"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/ioapic.c"
|
||
],
|
||
"versions": [
|
||
{
|
||
"version": "5.5",
|
||
"status": "affected"
|
||
},
|
||
{
|
||
"version": "0",
|
||
"lessThan": "5.5",
|
||
"status": "unaffected",
|
||
"versionType": "semver"
|
||
},
|
||
{
|
||
"version": "5.10.71",
|
||
"lessThanOrEqual": "5.10.*",
|
||
"status": "unaffected",
|
||
"versionType": "semver"
|
||
},
|
||
{
|
||
"version": "5.14.10",
|
||
"lessThanOrEqual": "5.14.*",
|
||
"status": "unaffected",
|
||
"versionType": "semver"
|
||
},
|
||
{
|
||
"version": "5.15",
|
||
"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": "5.5",
|
||
"versionEndExcluding": "5.10.71"
|
||
},
|
||
{
|
||
"vulnerable": true,
|
||
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
||
"versionStartIncluding": "5.5",
|
||
"versionEndExcluding": "5.14.10"
|
||
},
|
||
{
|
||
"vulnerable": true,
|
||
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
||
"versionStartIncluding": "5.5",
|
||
"versionEndExcluding": "5.15"
|
||
}
|
||
]
|
||
}
|
||
]
|
||
}
|
||
],
|
||
"references": [
|
||
{
|
||
"url": "https://git.kernel.org/stable/c/bebabb76ad9acca8858e0371e102fb60d708e25b"
|
||
},
|
||
{
|
||
"url": "https://git.kernel.org/stable/c/99a9e9b80f19fc63be005a33d76211dd23114792"
|
||
},
|
||
{
|
||
"url": "https://git.kernel.org/stable/c/2f9b68f57c6278c322793a06063181deded0ad69"
|
||
}
|
||
],
|
||
"title": "KVM: x86: Fix stack-out-of-bounds memory access from ioapic_write_indirect()",
|
||
"x_generator": {
|
||
"engine": "bippy-1.2.0"
|
||
}
|
||
},
|
||
"adp": [
|
||
{
|
||
"metrics": [
|
||
{
|
||
"other": {
|
||
"type": "ssvc",
|
||
"content": {
|
||
"timestamp": "2024-06-17T17:37:17.652949Z",
|
||
"id": "CVE-2021-47390",
|
||
"options": [
|
||
{
|
||
"Exploitation": "none"
|
||
},
|
||
{
|
||
"Automatable": "no"
|
||
},
|
||
{
|
||
"Technical Impact": "partial"
|
||
}
|
||
],
|
||
"role": "CISA Coordinator",
|
||
"version": "2.0.3"
|
||
}
|
||
}
|
||
}
|
||
],
|
||
"title": "CISA ADP Vulnrichment",
|
||
"providerMetadata": {
|
||
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
||
"shortName": "CISA-ADP",
|
||
"dateUpdated": "2024-06-17T17:38:01.491Z"
|
||
}
|
||
},
|
||
{
|
||
"providerMetadata": {
|
||
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
|
||
"shortName": "CVE",
|
||
"dateUpdated": "2024-08-04T05:39:59.812Z"
|
||
},
|
||
"title": "CVE Program Container",
|
||
"references": [
|
||
{
|
||
"url": "https://git.kernel.org/stable/c/bebabb76ad9acca8858e0371e102fb60d708e25b",
|
||
"tags": [
|
||
"x_transferred"
|
||
]
|
||
},
|
||
{
|
||
"url": "https://git.kernel.org/stable/c/99a9e9b80f19fc63be005a33d76211dd23114792",
|
||
"tags": [
|
||
"x_transferred"
|
||
]
|
||
},
|
||
{
|
||
"url": "https://git.kernel.org/stable/c/2f9b68f57c6278c322793a06063181deded0ad69",
|
||
"tags": [
|
||
"x_transferred"
|
||
]
|
||
}
|
||
]
|
||
}
|
||
]
|
||
}
|
||
} |