---
cve: "CVE-2024-26605"
severity: "LOW"
cvss: 3.1
epss: "21%"
vendor: "Linux"
kev: false
exploited: false
published: "2024-02-26 16:28:00"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-13T18:03:41+02:00"
---

# CVE-2024-26605

> 3.1 LOW

## Beschreibung

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.

## Patch verfügbar (OSV)

- Kernel ≥ 6.1.88
- Kernel ≥ 6.6.29
- Kernel ≥ 6.7.5

## Referenzen

- <https://git.kernel.org/stable/c/0f7908a016c092cfdaa16d785fa5099d867bc1a3>
- <https://git.kernel.org/stable/c/b0f4478838be1f1d330061201898fef65bf8fd7c>
- <https://git.kernel.org/stable/c/ef90508574d7af48420bdc5f7b9a4f1cdd26bc70>
- <https://git.kernel.org/stable/c/1e560864159d002b453da42bd2c13a1805515a20>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2024-26605) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_