CVE-2025-39871None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: Remove improper idxd_free The call to idxd_free() introduces a duplicate put_device() leading to a reference count underflow: refcount_t: underflow; u…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
In the Linux kernel, the following vulnerability has been resolved:
dmaengine: idxd: Remove improper idxd_free
The call to idxd_free() introduces a duplicate put_device() leading to a reference count underflow: refcount_t: underflow; use-after-free. WARNING: CPU: 15 PID: 4428 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110 ... Call Trace: <TASK> idxd_remove+0xe4/0x120 [idxd] pci_device_remove+0x3f/0xb0 device_release_driver_internal+0x197/0x200 driver_detach+0x48/0x90 bus_remove_driver+0x74/0xf0 pci_unregister_driver+0x2e/0xb0 idxd_exit_module+0x34/0x7a0 [idxd] __do_sys_delete_module.constprop.0+0x183/0x280 do_syscall_64+0x54/0xd70 entry_SYSCALL_64_after_hwframe+0x76/0x7e
The idxd_unregister_devices() which is invoked at the very beginning of idxd_remove(), already takes care of the necessary put_device() through the following call path: idxd_unregister_devices() -> device_unregister() -> put_device()
In addition, when CONFIG_DEBUG_KOBJECT_RELEASE is enabled, put_device() may trigger asynchronous cleanup via schedule_delayed_work(). If idxd_free() is called immediately after, it can result in a use-after-free.
Remove the improper idxd_free() to avoid both the refcount underflow and potential memory corruption during module unload.
Linux >= 68ac5a01f635b3791196fd1c39bc48497252c36f < 24414bbcb37e1af95190af36c21ae51d497e1a9eLinux >= d2d05fd0fc95c4defed6f7b87550e20e8baa1d97 < 0e95ee7f532b21206fe3f1c4054002b0d21e3b9cLinux >= 21f9f5cd9a0c75084d4369ba0b8c4f695c41dea7 < dd7a7e43269711d757fc260b0bbdf7138f75de11Linux >= d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805 < da4fbc1488a4cec6748da685181ee4449a878dacLinux >= d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805 < f41c538881eec4dcf5961a242097d447f848cda6Linux 2b7a961cea0e5b65afda911f76d14fec5c98d024Linux >= 6.1.140 < 6.1.160Linux >= 6.6.92 < 6.6.107Linux >= 6.12.30 < 6.12.48Linux >= 6.14.8 < 6.15Linux 6.15Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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