452 lines
23 KiB
JSON
452 lines
23 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-2024-46750",
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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": "2024-09-11T15:12:18.267Z",
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"datePublished": "2024-09-18T07:12:10.484Z",
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"dateUpdated": "2026-10-15T00:50:41.606Z"
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},
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"dateUpdated": "2026-08-05T11:38:20.290Z"
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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\nPCI: Add missing bridge lock to pci_bus_lock()\n\nOne of the true positives that the cfg_access_lock lockdep effort\nidentified is this sequence:\n\n WARNING: CPU: 14 PID: 1 at drivers/pci/pci.c:4886 pci_bridge_secondary_bus_reset+0x5d/0x70\n RIP: 0010:pci_bridge_secondary_bus_reset+0x5d/0x70\n Call Trace:\n <TASK>\n ? __warn+0x8c/0x190\n ? pci_bridge_secondary_bus_reset+0x5d/0x70\n ? report_bug+0x1f8/0x200\n ? handle_bug+0x3c/0x70\n ? exc_invalid_op+0x18/0x70\n ? asm_exc_invalid_op+0x1a/0x20\n ? pci_bridge_secondary_bus_reset+0x5d/0x70\n pci_reset_bus+0x1d8/0x270\n vmd_probe+0x778/0xa10\n pci_device_probe+0x95/0x120\n\nWhere pci_reset_bus() users are triggering unlocked secondary bus resets.\nIronically pci_bus_reset(), several calls down from pci_reset_bus(), uses\npci_bus_lock() before issuing the reset which locks everything *but* the\nbridge itself.\n\nFor the same motivation as adding:\n\n bridge = pci_upstream_bridge(dev);\n if (bridge)\n pci_dev_lock(bridge);\n\nto pci_reset_function() for the \"bus\" and \"cxl_bus\" reset cases, add\npci_dev_lock() for @bus->self to pci_bus_lock().\n\n[bhelgaas: squash in recursive locking deadlock fix from Keith Busch:\nhttps://lore.kernel.org/r/20240711193650.701834-1-kbusch@meta.com]"
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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 - The reset paths are reached only from local interfaces — the `VFIO_DEVICE_PCI_HOT_RESET` ioctl on an open VFIO device fd, sysfs attributes such as `reset_subordinate`, or driver probe/recovery paths. No remote or adjacent-network data path reaches `pci_bus_lock()`.\nAC:L - The attacker controls both sides of the race: they trigger the bus reset on demand via the VFIO ioctl, and the bridge stays unlocked for the full `msleep(2)` plus up to ~1 s of `pci_bridge_wait_for_secondary_bus()` link polling, so no precise timing or unattainable memory layout is needed.\nPR:L - `VFIO_DEVICE_PCI_HOT_RESET` requires only an open VFIO device fd, which libvirt/QEMU and DPDK deployments routinely hand to an unprivileged user; no root or capability in the init namespace is needed to drive `pci_reset_bus()` repeatedly.\nUI:N - The attacker issues the ioctl (or repeatedly opens/closes the VFIO device) entirely on their own; no victim action is required to reach the unlocked reset.\nS:U - The corruption and any resulting crash stay within the kernel's own security authority — there is no guest-to-host escape or IOMMU/DMA boundary crossing, and VFIO already requires all bus-affected devices to be in the caller's device set.\nC:H - The bridge's `device_lock` is not held across the sleeping reset, so driver unbind/remove and PM transitions on the bridge run unsynchronized against an in-flight reset that keeps dereferencing `bus->self` and its port-service state, giving a use-after-free class read primitive over freed kernel objects.\nI:H - Without `pci_cfg_access_lock()` on the bridge, concurrent config writes and a parallel `pci_dev_save_and_disable()`/`pci_dev_restore()` on the same bridge interleave with the `PCI_BRIDGE_CONTROL` read-modify-write, corrupting bridge state (bus numbers, MMIO windows, COMMAND, control bits); the same missing `device_lock` makes the driver-model race exploitable for kernel memory corruption.\nA:H - A lost update can leave `PCI_BRIDGE_CTL_BUS_RESET` asserted, permanently removing every device behind the bridge (potentially the root storage or network controller), and the unlocked unbind/remove-versus-reset race produces oopses and hangs; the reset is repeatable at will."
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}
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]
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}
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],
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"drivers/pci/pci.c"
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],
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},
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"version": "4.19.322",
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"lessThanOrEqual": "4.19.*",
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}
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],
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"title": "PCI: Add missing bridge lock to pci_bus_lock()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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{
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{
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"content": {
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"timestamp": "2024-09-29T14:47:52.159037Z",
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"id": "CVE-2024-46750",
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"options": [
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{
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"Exploitation": "none"
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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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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"shortName": "CISA-ADP",
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"dateUpdated": "2024-09-29T14:48:07.141Z"
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}
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},
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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://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
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},
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{
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"url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T22:17:46.292Z"
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}
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"dateUpdated": "2026-10-15T00:50:41.606Z"
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},
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"affected": [
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"vendor": "Siemens",
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"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
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"versions": [
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{
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"status": "affected",
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"versions": [
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"versions": [
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{
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"product": "SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family",
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"versions": [
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{
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"status": "affected",
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},
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{
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"vendor": "Siemens",
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"versions": [
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{
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|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-398330.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-355557.html"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
} |