{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-46750", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-09-11T15:12:18.267Z", "datePublished": "2024-09-18T07:12:10.484Z", "dateUpdated": "2026-08-05T11:38:20.290Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:38:20.290Z" }, "descriptions": [ { "lang": "en", "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 \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]" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/pci/pci.c" ], "versions": [ { "version": "090a3c5322e900f468b3205b76d0837003ad57b2", "lessThan": "0790b89c7e911003b8c50ae50e3ac7645de1fae9", "status": "affected", "versionType": "git" }, { "version": "090a3c5322e900f468b3205b76d0837003ad57b2", "lessThan": "df77a678c33871a6e4ac5b54a71662f1d702335b", "status": "affected", "versionType": "git" }, { "version": "090a3c5322e900f468b3205b76d0837003ad57b2", "lessThan": "e2355d513b89a2cb511b4ded0deb426cdb01acd0", "status": "affected", "versionType": "git" }, { "version": "090a3c5322e900f468b3205b76d0837003ad57b2", "lessThan": "04e85a3285b0e5c5af6fd2c0fd6e95ffecc01945", "status": "affected", "versionType": "git" }, { "version": "090a3c5322e900f468b3205b76d0837003ad57b2", "lessThan": "7253b4fed46471cc247c6cacefac890a8472c083", "status": "affected", "versionType": "git" }, { "version": "090a3c5322e900f468b3205b76d0837003ad57b2", "lessThan": "78c6e39fef5c428960aff742149bba302dd46f5a", "status": "affected", "versionType": "git" }, { "version": "090a3c5322e900f468b3205b76d0837003ad57b2", "lessThan": "81c68e218ab883dfa368460a59b674084c0240da", "status": "affected", "versionType": "git" }, { "version": "090a3c5322e900f468b3205b76d0837003ad57b2", "lessThan": "a4e772898f8bf2e7e1cf661a12c60a5612c4afab", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/pci/pci.c" ], "versions": [ { "version": "3.12", "status": "affected" }, { "version": "0", "lessThan": "3.12", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.322", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.284", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.226", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.167", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.110", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.51", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.10", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11", "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": "3.12", "versionEndExcluding": "4.19.322" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "5.4.284" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "5.10.226" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "5.15.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.1.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.6.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.10.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/0790b89c7e911003b8c50ae50e3ac7645de1fae9" }, { "url": "https://git.kernel.org/stable/c/df77a678c33871a6e4ac5b54a71662f1d702335b" }, { "url": "https://git.kernel.org/stable/c/e2355d513b89a2cb511b4ded0deb426cdb01acd0" }, { "url": "https://git.kernel.org/stable/c/04e85a3285b0e5c5af6fd2c0fd6e95ffecc01945" }, { "url": "https://git.kernel.org/stable/c/7253b4fed46471cc247c6cacefac890a8472c083" }, { "url": "https://git.kernel.org/stable/c/78c6e39fef5c428960aff742149bba302dd46f5a" }, { "url": "https://git.kernel.org/stable/c/81c68e218ab883dfa368460a59b674084c0240da" }, { "url": "https://git.kernel.org/stable/c/a4e772898f8bf2e7e1cf661a12c60a5612c4afab" } ], "title": "PCI: Add missing bridge lock to pci_bus_lock()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-09-29T14:47:52.159037Z", "id": "CVE-2024-46750", 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"V3.2", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family", "versions": [ { "status": "affected", "version": "0", "lessThan": "V3.2", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SCALANCE XCM-/XRM-/XCH-/XRH-300 family", "versions": [ { "status": "affected", "version": "0", "lessThan": "V3.2", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [ { "status": "affected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.0", "lessThan": "V3.1.5", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.0", "lessThan": "V3.1.5", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.0", "lessThan": "V3.1.5", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.0", "lessThan": "V3.1.5", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.0", "lessThan": "V3.1.5", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "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" } ] } ] } }