{"id":"CVE-2026-64376","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware_loader: fix device reference leak in firmware_upload_register()\n\nfirmware_upload_register()\n  -> fw_create_instance()\n     -> device_initialize()\n\nAfter fw_cre…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware_loader: fix device reference leak in firmware_upload_register()\n\nfirmware_upload_register()\n  -> fw_create_instance()\n     -> device_initialize()\n\nAfter fw_cre…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.19, < 6.1.178","linux_kernel >= 6.2, < 6.6.145","linux_kernel >= 6.7, < 6.12.96","linux_kernel >= 6.13, < 6.18.39","linux_kernel >= 6.19, < 7.1.4"],"patched":["linux_kernel 7.1.4"],"published":"2026-07-25","updated":"2026-09-08","sourceUpdated":"2026-09-08T14:21:55.037","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-64376","references":[{"url":"https://git.kernel.org/stable/c/15432f19562fdb9199cce6d9fc24db12c71ed574","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2619b47a0c8114eef980a56ade7e3ef4b58eb384","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/46d403da376a8b7c1187193294953816e1a8d7fe","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/517676ec7dfca064e08f94007a4abd21969de0a0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/896df22ee57648b0c505bd76ddbc6b2341834696","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/92f41769e5fd16bcd9ba97500d0517332e0a5b45","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64376.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-64376"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2507205"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64376"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64376"},{"url":"https://lore.kernel.org/linux-cve-announce/2026072524-CVE-2026-64376-efcf@gregkh/T"}],"tags":["nvd","csaf","vex","red-hat"],"epss":0.00123,"epssPercentile":0.02349,"ingestedAt":"2026-09-08T15:33:26.948Z","cwe":["CWE-911"],"slug":"CVE-2026-64376","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nfirmware_loader: fix device reference leak in firmware_upload_register()\n\nfirmware_upload_register()\n  -> fw_create_instance()\n     -> device_initialize()\n\nAfter fw_create_instance() succeeds, the lifetime of the embedded struct\ndevice is expected to be managed through the device core reference\ncounting, since fw_create_instance() has already called\ndevice_initialize().\n\nIn firmware_upload_register(), if alloc_lookup_fw_priv() fails after\nfw_create_instance() succeeds, the code reaches free_fw_sysfs and frees\nfw_sysfs directly instead of releasing the device reference with\nput_device(). This may leave the reference count of the embedded struct\ndevice unbalanced, resulting in a refcount leak.\n\nThe issue was identified by a static analysis tool I developed and\nconfirmed by manual review. Fix this by using put_device(fw_dev) in the\nfailure path and letting fw_dev_release() handle the final cleanup,\ninstead of freeing the instance directly from the error path.\n\n## Affected\n\n- `linux_kernel >= 5.19, < 6.1.178`\n- `linux_kernel >= 6.2, < 6.6.145`\n- `linux_kernel >= 6.7, < 6.12.96`\n- `linux_kernel >= 6.13, < 6.18.39`\n- `linux_kernel >= 6.19, < 7.1.4`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 7.1.4`\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-09-08 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64376.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}