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CVE Record

CVE-2024-26605: PCI/ASPM: Fix deadlock when enabling ASPM

In the Linux kernel, the following vulnerability has been resolved: PCI/ASPM: Fix deadlock when enabling ASPM A last minute revert in 6.7-final introduced a potential deadlock when enabling ASPM during probe of Qualcomm PCIe controllers as reported by lockdep: ============================================ WARNING: possible recursive locking detected 6.7.0 #40 Not tainted -------------------------------------------- kworker/u16:5/90 is trying to acquire lock: ffffacfa78ced000 (pci_bus_sem){++++}-{3:3}, at: pcie_aspm_pm_state_change+0x58/0xdc but task is already holding lock: ffffacfa78ced000 (pci_bus_sem){++++}-{3:3}, at: pci_walk_bus+0x34/0xbc other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(pci_bus_sem); lock(pci_bus_sem); *** DEADLOCK *** Call trace: print_deadlock_bug+0x25c/0x348 __lock_acquire+0x10a4/0x2064 lock_acquire+0x1e8/0x318 down_read+0x60/0x184 pcie_aspm_pm_state_change+0x58/0xdc pci_set_full_power_state+0xa8/0x114 pci_set_power_state+0xc4/0x120 qcom_pcie_enable_aspm+0x1c/0x3c [pcie_qcom] pci_walk_bus+0x64/0xbc qcom_pcie_host_post_init_2_7_0+0x28/0x34 [pcie_qcom] The deadlock can easily be reproduced on machines like the Lenovo ThinkPad X13s by adding a delay to increase the race window during asynchronous probe where another thread can take a write lock. Add a new pci_set_power_state_locked() and associated helper functions that can be called with the PCI bus semaphore held to avoid taking the read lock twice.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue can deadlock a system while enabling PCIe power management on some Qualcomm PCIe controller platforms. The business impact is likely availability disruption on affected hardware rather than data theft or remote compromise. Public severity data is incomplete, and the bundle does not show active exploitation.

Executive priority

Treat this as a targeted availability risk. Patch during the next kernel maintenance window, sooner for affected Qualcomm-based fleets or systems showing boot/probe instability. It does not currently justify emergency response absent local symptoms or vendor escalation.

Technical view

The bug is recursive acquisition of pci_bus_sem during ASPM enablement in Qualcomm PCIe controller probe paths. The kernel fix adds pci_set_power_state_locked() and helper paths for callers already holding the PCI bus semaphore. Reported reproduction involves Lenovo ThinkPad X13s-like systems and asynchronous probe timing.

Likely exposure

Exposure is limited to Linux systems running affected kernel versions with the relevant PCIe ASPM and Qualcomm PCIe controller path. The bundle lists affected Linux kernel lines including 6.7, 6.7.5, 6.8, 6.1.88, and 6.6.29, but distro package mapping must be verified separately.

Exploitation context

No KEV listing is present, and the provided sources do not claim exploitation in the wild. The evidence describes a race/deadlock found by lockdep and reproducible under timing changes, not an externally weaponized attack path.

Researcher notes

The source bundle lacks CVSS, CWE, and distro-specific package status. Analysis should focus on kernel lineage, stable backports, and hardware reachability of the qcom_pcie ASPM path. Do not assume broader PCIe exposure without confirming code path use.

Mitigation direction

  • Apply Linux vendor or distribution kernel updates containing the referenced stable fixes.
  • Prioritize Qualcomm PCIe controller platforms and Lenovo ThinkPad X13s-like hardware.
  • Track distro advisories for exact fixed package versions.
  • Avoid direct kernel deployment shortcuts; follow normal tested update channels.

Validation and detection

  • Inventory Linux kernel versions across laptops, edge devices, and ARM64 fleets.
  • Identify systems using Qualcomm PCIe controller drivers and ASPM.
  • Confirm installed kernels include the referenced stable fix commits or later vendor backports.
  • Review boot and kernel logs for PCIe ASPM or lockdep deadlock symptoms.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2024-26605 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
2ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxb9c370b61d735a0e5390c42771e7eb21413f7868, 8cc22ba3f77c59df5f1ac47d62df51efb28cd868, f93e71aea6c60ebff8adbd8941e678302d377869, f93e71aea6c60ebff8adbd8941e678302d377869, 1f2f662c8bec75d1311e063efaa9107435cf16c8, 6.1.72, 6.6.11, 5.15.147unaffected
LinuxLinux6.7, 0, 6.1.88, 6.6.29, 6.7.5, 6.8affected
Weakness

CWE details

No CWE listed

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