PCI/DPC: Fix use-after-free on concurrent DPC and hot-removal

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-42302
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-08-17 09:15:10 UTC
Updated2026-05-12 12:17:06 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: PCI/DPC: Fix use-after-free on concurrent DPC and hot-removal Keith reports a use-after-free when a DPC event occurs concurrently to hot-removal of the same portion of the hierarchy: The dpc_handler() awaits readiness of the secondary bus below the Downstream Port where the DPC event occurred. To do so, it polls the config space of the first child device on the secondary bus. If that child device is concurrently removed, accesses to its struct pci_dev cause the kernel to oops. That's because pci_bridge_wait_for_secondary_bus() neglects to hold a reference on the child device. Before v6.3, the function was only called on resume from system sleep or on runtime resume. Holding a reference wasn't necessary back then because the pciehp IRQ thread could never run concurrently. (On resume from system sleep, IRQs are not enabled until after the resume_noirq phase. And runtime resume is always awaited before a PCI device is removed.) However starting with v6.3, pci_bridge_wait_for_secondary_bus() is also called on a DPC event. Commit 53b54ad074de ("PCI/DPC: Await readiness of secondary bus after reset"), which introduced that, failed to appreciate that pci_bridge_wait_for_secondary_bus() now needs to hold a reference on the child device because dpc_handler() and pciehp may indeed run concurrently. The commit was backported to v5.10+ stable kernels, so that's the oldest one affected. Add the missing reference acquisition. Abridged stack trace: BUG: unable to handle page fault for address: 00000000091400c0 CPU: 15 PID: 2464 Comm: irq/53-pcie-dpc 6.9.0 RIP: pci_bus_read_config_dword+0x17/0x50 pci_dev_wait() pci_bridge_wait_for_secondary_bus() dpc_reset_link() pcie_do_recovery() dpc_handler()

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-416

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 11.0 All All All
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d0292124bb5787a2f1ab1316509e801ca89c10fb c52f9e1a9eb40f13993142c331a6cfd334d4b91d git Not specified
CNA Linux Linux affected ffe2318405e605f1b3985ce188eff69e6d1d1baa 2c111413f38ca5cf87557cab89f6d82b0e3433e7 git Not specified
CNA Linux Linux affected 189f856e76f5463f59efb5fc18dcc1692d04c41a f63df70b439bb8331358a306541893bf415bf1da git Not specified
CNA Linux Linux affected 53b54ad074de1896f8b021615f65b27f557ce874 2cc8973bdc4d6c928ebe38b88090a2cdfe81f42f git Not specified
CNA Linux Linux affected 53b54ad074de1896f8b021615f65b27f557ce874 b16f3ea1db47a6766a9f1169244cf1fc287a7c62 git Not specified
CNA Linux Linux affected 53b54ad074de1896f8b021615f65b27f557ce874 11a1f4bc47362700fcbde717292158873fb847ed git Not specified
CNA Linux Linux affected 0081032082b5b45ca902b3c3d6986cb5cca69ff2 git Not specified
CNA Linux Linux affected 6.3 Not specified
CNA Linux Linux unaffected 6.3 semver Not specified
CNA Linux Linux unaffected 5.10.224 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.165 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.103 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.44 6.6.* semver Not specified
CNA Linux Linux unaffected 6.10.3 6.10.* semver Not specified
CNA Linux Linux unaffected 6.11 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f63df70b439bb8331358a306541893bf415bf1da 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2cc8973bdc4d6c928ebe38b88090a2cdfe81f42f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2c111413f38ca5cf87557cab89f6d82b0e3433e7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/c52f9e1a9eb40f13993142c331a6cfd334d4b91d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2024/10/msg00003.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/b16f3ea1db47a6766a9f1169244cf1fc287a7c62 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/11a1f4bc47362700fcbde717292158873fb847ed 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/01/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
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