{"id":"CVE-2025-39871","state":"PUBLISHED","title":"dmaengine: idxd: Remove improper idxd_free","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: Remove improper idxd_free\n\nThe call to idxd_free() introduces a duplicate put_device() leading to a\nreference count underflow:\nrefcount_t: underflow; use-after-free.\nWARNING: CPU: 15 PID: 4428 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110\n...\nCall Trace:\n <TASK>\n  idxd_remove+0xe4/0x120 [idxd]\n  pci_device_remove+0x3f/0xb0\n  device_release_driver_internal+0x197/0x200\n  driver_detach+0x48/0x90\n  bus_remove_driver+0x74/0xf0\n  pci_unregister_driver+0x2e/0xb0\n  idxd_exit_module+0x34/0x7a0 [idxd]\n  __do_sys_delete_module.constprop.0+0x183/0x280\n  do_syscall_64+0x54/0xd70\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThe idxd_unregister_devices() which is invoked at the very beginning of\nidxd_remove(), already takes care of the necessary put_device() through the\nfollowing call path:\nidxd_unregister_devices() -> device_unregister() -> put_device()\n\nIn addition, when CONFIG_DEBUG_KOBJECT_RELEASE is enabled, put_device() may\ntrigger asynchronous cleanup via schedule_delayed_work(). If idxd_free() is\ncalled immediately after, it can result in a use-after-free.\n\nRemove the improper idxd_free() to avoid both the refcount underflow and\npotential memory corruption during module unload.","publishedAt":"2025-09-23T06:00:44.882Z","updatedAt":"2026-10-15T01:08:33.888Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"68ac5a01f635b3791196fd1c39bc48497252c36f","status":"affected","lessThan":"24414bbcb37e1af95190af36c21ae51d497e1a9e","versionType":"git"},{"version":"d2d05fd0fc95c4defed6f7b87550e20e8baa1d97","status":"affected","lessThan":"0e95ee7f532b21206fe3f1c4054002b0d21e3b9c","versionType":"git"},{"version":"21f9f5cd9a0c75084d4369ba0b8c4f695c41dea7","status":"affected","lessThan":"dd7a7e43269711d757fc260b0bbdf7138f75de11","versionType":"git"},{"version":"d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805","status":"affected","lessThan":"da4fbc1488a4cec6748da685181ee4449a878dac","versionType":"git"},{"version":"d5449ff1b04dfe9ed8e455769aa01e4c2ccf6805","status":"affected","lessThan":"f41c538881eec4dcf5961a242097d447f848cda6","versionType":"git"},{"version":"2b7a961cea0e5b65afda911f76d14fec5c98d024","status":"affected","versionType":"git"},{"version":"6.1.140","status":"affected","lessThan":"6.1.160","versionType":"semver"},{"version":"6.6.92","status":"affected","lessThan":"6.6.107","versionType":"semver"},{"version":"6.12.30","status":"affected","lessThan":"6.12.48","versionType":"semver"},{"version":"6.14.8","status":"affected","lessThan":"6.15","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/idxd/init.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.15","versionType":"semver"},{"version":"6.1.160","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.107","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.48","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.16.8","status":"unaffected","lessThanOrEqual":"6.16.*","versionType":"semver"},{"version":"6.17","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/idxd/init.c"]}],"references":["https://git.kernel.org/stable/c/24414bbcb37e1af95190af36c21ae51d497e1a9e","https://git.kernel.org/stable/c/0e95ee7f532b21206fe3f1c4054002b0d21e3b9c","https://git.kernel.org/stable/c/dd7a7e43269711d757fc260b0bbdf7138f75de11","https://git.kernel.org/stable/c/da4fbc1488a4cec6748da685181ee4449a878dac","https://git.kernel.org/stable/c/f41c538881eec4dcf5961a242097d447f848cda6","https://cert-portal.siemens.com/productcert/html/ssa-019113.html","https://cert-portal.siemens.com/productcert/html/ssa-457936.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/39xxx/CVE-2025-39871.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-39871","state":"PUBLISHED","datePublished":"2025-09-23T06:00:44.882Z","dateUpdated":"2026-10-15T01:08:33.888Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T07:20:57.143Z"},"containers":{"cna":{"title":"dmaengine: idxd: Remove improper idxd_free","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: Remove improper idxd_free\n\nThe call to idxd_free() introduces a duplicate put_device() leading to a\nreference count underflow:\nrefcount_t: underflow; use-after-free.\nWARNING: CPU: 15 PID: 4428 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110\n...\nCall Trace:\n <TASK>\n  idxd_remove+0xe4/0x120 [idxd]\n  pci_device_remove+0x3f/0xb0\n  device_release_driver_internal+0x197/0x200\n  driver_detach+0x48/0x90\n  bus_remove_driver+0x74/0xf0\n  pci_unregister_driver+0x2e/0xb0\n  idxd_exit_module+0x34/0x7a0 [idxd]\n  __do_sys_delete_module.constprop.0+0x183/0x280\n  do_syscall_64+0x54/0xd70\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThe idxd_unregister_devices() which is invoked at the very beginning of\nidxd_remove(), already takes care of the necessary put_device() through the\nfollowing call path:\nidxd_unregister_devices() -> device_unregister() -> put_device()\n\nIn addition, when CONFIG_DEBUG_KOBJECT_RELEASE is enabled, put_device() may\ntrigger asynchronous cleanup via schedule_delayed_work(). If idxd_free() is\ncalled immediately after, it can result in a use-after-free.\n\nRemove the improper idxd_free() to avoid both the refcount underflow and\npotential memory corruption during module 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