dmaengine: idxd: Remove improper idxd_free

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-39871
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-23 06:15:46 UTC
Updated2026-07-14 13:17:50 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-416

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 68ac5a01f635b3791196fd1c39bc48497252c36f 24414bbcb37e1af95190af36c21ae51d497e1a9e git Not specified
CNA Linux Linux affected d2d05fd0fc95c4defed6f7b87550e20e8baa1d97 0e95ee7f532b21206fe3f1c4054002b0d21e3b9c git Not specified
CNA Linux Linux affected 21f9f5cd9a0c75084d4369ba0b8c4f695c41dea7 dd7a7e43269711d757fc260b0bbdf7138f75de11 git Not specified
CNA Linux Linux affected d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805 da4fbc1488a4cec6748da685181ee4449a878dac git Not specified
CNA Linux Linux affected d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805 f41c538881eec4dcf5961a242097d447f848cda6 git Not specified
CNA Linux Linux affected 2b7a961cea0e5b65afda911f76d14fec5c98d024 git Not specified
CNA Linux Linux affected 6.1.140 6.1.160 semver Not specified
CNA Linux Linux affected 6.6.92 6.6.107 semver Not specified
CNA Linux Linux affected 6.12.30 6.12.48 semver Not specified
CNA Linux Linux affected 6.14.8 6.15 semver Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 6.1.160 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.107 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.48 6.12.* semver Not specified
CNA Linux Linux unaffected 6.16.8 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0e95ee7f532b21206fe3f1c4054002b0d21e3b9c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/24414bbcb37e1af95190af36c21ae51d497e1a9e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
cert-portal.siemens.com/productcert/html/ssa-019113.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/f41c538881eec4dcf5961a242097d447f848cda6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/da4fbc1488a4cec6748da685181ee4449a878dac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/dd7a7e43269711d757fc260b0bbdf7138f75de11 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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