Answer in brief
CVE-2025-39871 records a High severity (CVSS 7.8) vulnerability in dmaengine: idxd: Remove improper idxd_free. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2025-39871 records a High severity (CVSS 7.8) vulnerability in dmaengine: idxd: Remove improper idxd_free. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=68ac5a01f635b3791196fd1c39bc48497252c36f <24414bbcb37e1af95190af36c21ae51d497e1a9e || >=d2d05fd0fc95c4defed6f7b87550e20e8baa1d97 <0e95ee7f532b21206fe3f1c4054002b0d21e3b9c || >=21f9f5cd9a0c75084d4369ba0b8c4f695c41dea7 <dd7a7e43269711d757fc260b0bbdf7138f75de11 || >=d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805 <da4fbc1488a4cec6748da685181ee4449a878dac || >=d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805 <f41c538881eec4dcf5961a242097d447f848cda6 || 2b7a961cea0e5b65afda911f76d14fec5c98d024 || >=6.1.140 <6.1.160 || >=6.6.92 <6.6.107 || >=6.12.30 <6.12.48 || >=6.14.8 <6.15 | 24414bbcb37e1af95190af36c21ae51d497e1a9e, 0e95ee7f532b21206fe3f1c4054002b0d21e3b9c, dd7a7e43269711d757fc260b0bbdf7138f75de11, da4fbc1488a4cec6748da685181ee4449a878dac, f41c538881eec4dcf5961a242097d447f848cda6, 6.1.160, 6.6.107, 6.12.48, 6.15 |
| Linux/Linuxgeneric | 6.15 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
Published upstream
Sep 23, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=68ac5a01f635b3791196fd1c39bc48497252c36f <24414bbcb37e1af95190af36c21ae51d497e1a9e || >=d2d05fd0fc95c4defed6f7b87550e20e8baa1d97 <0e95ee7f532b21206fe3f1c4054002b0d21e3b9c || >=21f9f5cd9a0c75084d4369ba0b8c4f695c41dea7 <dd7a7e43269711d757fc260b0bbdf7138f75de11 || >=d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805 <da4fbc1488a4cec6748da685181ee4449a878dac || >=d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805 <f41c538881eec4dcf5961a242097d447f848cda6 || 2b7a961cea0e5b65afda911f76d14fec5c98d024 || >=6.1.140 <6.1.160 || >=6.6.92 <6.6.107 || >=6.12.30 <6.12.48 || >=6.14.8 <6.15 | 24414bbcb37e1af95190af36c21ae51d497e1a9e, 0e95ee7f532b21206fe3f1c4054002b0d21e3b9c, dd7a7e43269711d757fc260b0bbdf7138f75de11, da4fbc1488a4cec6748da685181ee4449a878dac, f41c538881eec4dcf5961a242097d447f848cda6, 6.1.160, 6.6.107, 6.12.48, 6.15 |
| Linux/Linuxgeneric | 6.15 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
Published upstream
Sep 23, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.