dmaengine: idxd: Remove improper idxd_free
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: 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.
CVE-2025-39871
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-39871
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "68ac5a01f635b3791196fd1c39bc48497252c36f",
"lessThan": "24414bbcb37e1af95190af36c21ae51d497e1a9e",
"versionType": "git"
},
{
"status": "affected",
"version": "d2d05fd0fc95c4defed6f7b87550e20e8baa1d97",
"lessThan": "0e95ee7f532b21206fe3f1c4054002b0d21e3b9c",
"versionType": "git"
},
{
"status": "affected",
"version": "21f9f5cd9a0c75084d4369ba0b8c4f695c41dea7",
"lessThan": "dd7a7e43269711d757fc260b0bbdf7138f75de11",
"versionType": "git"
},
{
"status": "affected",
"version": "d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805",
"lessThan": "da4fbc1488a4cec6748da685181ee4449a878dac",
"versionType": "git"
},
{
"status": "affected",
"version": "d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805",
"lessThan": "f41c538881eec4dcf5961a242097d447f848cda6",
"versionType": "git"
},
{
"status": "affected",
"version": "2b7a961cea0e5b65afda911f76d14fec5c98d024",
"versionType": "git"
},
{
"status": "affected",
"version": "6.1.140",
"lessThan": "6.1.160",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.92",
"lessThan": "6.6.107",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.30",
"lessThan": "6.12.48",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.14.8",
"lessThan": "6.15",
"versionType": "semver"
}
],
"programFiles": [
"drivers/dma/idxd/init.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.160",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.107",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.48",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.16.8",
"versionType": "semver",
"lessThanOrEqual": "6.16.*"
},
{
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/dma/idxd/init.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-39871
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #27074 · Revision 1
- Added to Heist Feed
- Publisher date