222 lines
13 KiB
JSON
222 lines
13 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-2026-72380",
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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": "2026-08-09T03:40:39.922Z",
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"datePublished": "2026-08-15T05:56:12.866Z",
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"dateUpdated": "2026-10-30T12:29:12.462Z"
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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": "2026-10-30T12:29:12.462Z"
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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\nxen/pvcalls: bound backend response req_id before indexing rsp[]\n\npvcalls_front_event_handler() takes req_id directly from the\nbackend-supplied ring response and uses it to index the fixed-size\nbedata->rsp[] array for a memcpy() and a store, with no range check. A\nmalicious or buggy backend can set req_id past PVCALLS_NR_RSP_PER_RING\nand drive an out-of-bounds write past the bedata allocation.\n\nreq_id was also declared int while the wire field rsp->req_id is u32, so\na range check on the signed value alone is insufficient: a backend\nreq_id of 0xffffffff becomes -1, passes a >= PVCALLS_NR_RSP_PER_RING\ntest and indexes bedata->rsp[-1]. Declare req_id as u32 so a single\nbound covers both ends.\n\nA backend that sends an out-of-range req_id has violated the wire\nprotocol, so rather than silently dropping the response, log once and\nstop trusting the backend: set bedata->disabled. The event handler then\nignores further responses, and the request paths that wait for a\nresponse return -EIO instead of blocking forever. This mirrors the\nfatal-error handling xen-netback uses (xenvif_fatal_tx_err()).\n\nThe pvcalls frontend currently trusts its backend, so this is not a\nclassic-Xen security issue, but it matters for hardening PV frontends\nagainst malicious backends (confidential and disaggregated deployments)."
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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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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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:A - The bug is reached when a malicious Xen PVCalls backend writes crafted responses into the shared grant-table ring and notifies the guest frontend via an inter-domain event channel; this is an adjacent on-host backend-to-guest path, not remote IP delivery to the guest.\nAC:L - A compromised backend fully controls ring response contents and can set any req_id (including 0xffffffff for rsp[-1]) and re-notify the frontend IRQ at will; no races or attacker-uncontrollable heap layout are required to trigger the out-of-bounds write.\nPR:N - No credentials inside the vulnerable guest are needed; once the pvcalls frontend is xenbus-connected to a backend, that backend alone can inject the malformed response. Backend/domain control is the attack position, not privileges obtainable in the guest via user namespaces.\nUI:N - No victim user or application action is required after xenbus binds the pvcalls frontend to its backend; backend-driven ring writes and event-channel interrupts alone reach pvcalls_front_event_handler() without mounts, socket use, or other interactive steps.\nS:U - The out-of-bounds write corrupts kmalloc heap memory and kernel objects within the guest running the pvcalls frontend. This is backend-to-guest hardening, not a demonstrated guest-to-host or hypervisor escape across the VM security boundary.\nC:H - Backend-chosen req_id indexes bedata->rsp[] out of bounds for a ~20-byte memcpy plus req_id store, corrupting adjacent kernel heap memory (including rsp[-1] via the signed req_id bug) and enabling plausible arbitrary kernel memory disclosure if shaped further.\nI:H - The heap out-of-bounds write can overwrite adjacent kmalloc objects or allocator metadata, providing a credible path to arbitrary guest-kernel memory modification and control-flow hijack rather than being limited to a bounded or non-security integrity effect.\nA:H - Corrupting kernel heap structures via the unbounded rsp[] indexing can immediately panic or oops the guest kernel; even unexploited attempts are likely to crash or disable the frontend, causing total loss of guest availability."
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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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"drivers/xen/pvcalls-front.c"
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],
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"versions": [
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{
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"version": "2195046bfd69e487d9a76dc47840f15c8412840c",
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"lessThan": "4aaf7f32f1569e2c0475e073b8d7ec63b231d4c6",
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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": "2195046bfd69e487d9a76dc47840f15c8412840c",
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"lessThan": "72e27ef70a20298e60a1de438f3628c515dea895",
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"status": "affected",
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"versionType": "git"
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"lessThan": "ede7a60b046d8b7288651c55198574ed7c259da7",
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"status": "affected",
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"versionType": "git"
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{
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"lessThan": "bc8f2d1c6f7cf6e6551c00eb582baf4b52a04794",
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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": "2195046bfd69e487d9a76dc47840f15c8412840c",
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"lessThan": "d1297a9e2fd6ce08678b370d41bc980ca798f809",
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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": "2195046bfd69e487d9a76dc47840f15c8412840c",
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"lessThan": "d33846c8dcc06b83b7acdeac1e8bfbb5c0c26cb2",
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"status": "affected",
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"versionType": "git"
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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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"drivers/xen/pvcalls-front.c"
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],
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"versions": [
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{
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"version": "4.15",
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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": "4.15",
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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": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.114",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.57",
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"lessThanOrEqual": "6.18.*",
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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": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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"versionStartIncluding": "4.15",
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"versionEndExcluding": "6.1.191"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/4aaf7f32f1569e2c0475e073b8d7ec63b231d4c6"
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},
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{
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"url": "https://git.kernel.org/stable/c/72e27ef70a20298e60a1de438f3628c515dea895"
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"url": "https://git.kernel.org/stable/c/ede7a60b046d8b7288651c55198574ed7c259da7"
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"url": "https://git.kernel.org/stable/c/bc8f2d1c6f7cf6e6551c00eb582baf4b52a04794"
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{
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"url": "https://git.kernel.org/stable/c/d1297a9e2fd6ce08678b370d41bc980ca798f809"
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},
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{
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"url": "https://git.kernel.org/stable/c/d33846c8dcc06b83b7acdeac1e8bfbb5c0c26cb2"
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}
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],
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"title": "xen/pvcalls: bound backend response req_id before indexing rsp[]",
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