CVE-2022-49434

System hang via PCI lock-order inversion

Published Feb 26, 2025 · Updated May 11, 2026

Improper locking in Linux kernel PCI code allows local users to hang affected systems by racing SR-IOV configuration with a PCI reset. The pci_dev_lock() path takes the configuration-space access lock before the device lock, while sriov_numvfs_store() takes the same locks in reverse order. The flaw requires local low-privileged access and concurrent SR-IOV reconfiguration and PCI device reset operations; a successful race deadlocks the kernel and interrupts the system.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux kernel PCI code allows local users to hang affected systems by racing SR-IOV configuration with a PCI reset. The pci_dev_lock() path takes the configuration-space access lock before the device lock, while sriov_numvfs_store() takes the same locks in reverse order. The flaw requires local low-privileged access and concurrent SR-IOV reconfiguration and PCI device reset operations; a successful race deadlocks the kernel and interrupts the system.

The record

CVE
CVE-2022-49434
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e <2cdd5284035322795b0964f899eefba254cfe483
  2. Affected versionversion=17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e <59ea6b3ae51df7cd6bfd84c9c0030609b9315622
  3. Affected versionversion=17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e <a91ee0e9fca9d7501286cfbced9b30a33e52740a
  4. Affected versionversion=17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e <aed6d4d519210c28817948f34c53b6e058e0456c
  5. Affected versionversion=17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e <c3c6dc1853b8bf3c718f96fd8480a6eb09ba4831
  6. Affected versionversion=17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e <c9a81f9ed6ae3554621d6a50220b1bc74b67d81e
  7. Affected versionversion=17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e <ea047f51172aa68841adef7f52d375002438b8f0
  8. Affected versionversion=17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e <eff3587b9c01439b738298475e555c028ac9f55e
  9. Affected versionversion=4.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e <2cdd5284035322795b0964f899eefba254cfe483; version=17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e <59ea6b3ae51df7cd6bfd84c9c0030609b9315622; version=17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e <a91ee0e9fca9d7501286cfbced9b30a33e52740a; version=17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e <aed6d4d519210c28817948f34c53b6e058e0456c; version=17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e <c3c6dc1853b8bf3c718f96fd8480a6eb09ba4831; version=17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e <c9a81f9ed6ae3554621d6a50220b1bc74b67d81e; version=17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e <ea047f51172aa68841adef7f52d375002438b8f0; version=17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e <eff3587b9c01439b738298475e555c028ac9f55e; version=4.13

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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