PCI/DPC: Fix use-after-free on concurrent DPC and hot-removal
In 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 acquisiti
CVE-2024-42302
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2024-42302
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "d0292124bb5787a2f1ab1316509e801ca89c10fb",
"lessThan": "c52f9e1a9eb40f13993142c331a6cfd334d4b91d",
"versionType": "git"
},
{
"status": "affected",
"version": "ffe2318405e605f1b3985ce188eff69e6d1d1baa",
"lessThan": "2c111413f38ca5cf87557cab89f6d82b0e3433e7",
"versionType": "git"
},
{
"status": "affected",
"version": "189f856e76f5463f59efb5fc18dcc1692d04c41a",
"lessThan": "f63df70b439bb8331358a306541893bf415bf1da",
"versionType": "git"
},
{
"status": "affected",
"version": "53b54ad074de1896f8b021615f65b27f557ce874",
"lessThan": "2cc8973bdc4d6c928ebe38b88090a2cdfe81f42f",
"versionType": "git"
},
{
"status": "affected",
"version": "53b54ad074de1896f8b021615f65b27f557ce874",
"lessThan": "b16f3ea1db47a6766a9f1169244cf1fc287a7c62",
"versionType": "git"
},
{
"status": "affected",
"version": "53b54ad074de1896f8b021615f65b27f557ce874",
"lessThan": "11a1f4bc47362700fcbde717292158873fb847ed",
"versionType": "git"
},
{
"status": "affected",
"version": "0081032082b5b45ca902b3c3d6986cb5cca69ff2",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.176",
"lessThan": "5.10.224",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.104",
"lessThan": "5.15.165",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.16",
"lessThan": "6.1.103",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.2.3",
"lessThan": "6.3",
"versionType": "semver"
}
],
"programFiles": [
"drivers/pci/pci.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.224",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.165",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.103",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.44",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.10.3",
"versionType": "semver",
"lessThanOrEqual": "6.10.*"
},
{
"status": "unaffected",
"version": "6.11",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/pci/pci.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-42302
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #26680 · Revision 1
- Added to Heist Feed
- Publisher date