{"id":"CVE-2026-64376","state":"PUBLISHED","title":"firmware_loader: fix device reference leak in firmware_upload_register()","description":"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_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.","publishedAt":"2026-07-25T08:50:27.577Z","updatedAt":"2026-08-17T04:54:27.297Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"97730bbb242cde22b7140acd202ffd88823886c9","status":"affected","lessThan":"517676ec7dfca064e08f94007a4abd21969de0a0","versionType":"git"},{"version":"97730bbb242cde22b7140acd202ffd88823886c9","status":"affected","lessThan":"46d403da376a8b7c1187193294953816e1a8d7fe","versionType":"git"},{"version":"97730bbb242cde22b7140acd202ffd88823886c9","status":"affected","lessThan":"2619b47a0c8114eef980a56ade7e3ef4b58eb384","versionType":"git"},{"version":"97730bbb242cde22b7140acd202ffd88823886c9","status":"affected","lessThan":"92f41769e5fd16bcd9ba97500d0517332e0a5b45","versionType":"git"},{"version":"97730bbb242cde22b7140acd202ffd88823886c9","status":"affected","lessThan":"15432f19562fdb9199cce6d9fc24db12c71ed574","versionType":"git"},{"version":"97730bbb242cde22b7140acd202ffd88823886c9","status":"affected","lessThan":"896df22ee57648b0c505bd76ddbc6b2341834696","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/base/firmware_loader/sysfs_upload.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/base/firmware_loader/sysfs_upload.c"]}],"references":["https://git.kernel.org/stable/c/517676ec7dfca064e08f94007a4abd21969de0a0","https://git.kernel.org/stable/c/46d403da376a8b7c1187193294953816e1a8d7fe","https://git.kernel.org/stable/c/2619b47a0c8114eef980a56ade7e3ef4b58eb384","https://git.kernel.org/stable/c/92f41769e5fd16bcd9ba97500d0517332e0a5b45","https://git.kernel.org/stable/c/15432f19562fdb9199cce6d9fc24db12c71ed574","https://git.kernel.org/stable/c/896df22ee57648b0c505bd76ddbc6b2341834696"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64376.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64376","state":"PUBLISHED","datePublished":"2026-07-25T08:50:27.577Z","dateUpdated":"2026-08-17T04:54:27.297Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.784Z"},"containers":{"cna":{"title":"firmware_loader: fix device reference leak in firmware_upload_register()","descriptions":[{"lang":"en","value":"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_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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"97730bbb242cde22b7140acd202ffd88823886c9","status":"affected","lessThan":"517676ec7dfca064e08f94007a4abd21969de0a0","versionType":"git"},{"version":"97730bbb242cde22b7140acd202ffd88823886c9","status":"affected","lessThan":"46d403da376a8b7c1187193294953816e1a8d7fe","versionType":"git"},{"version":"97730bbb242cde22b7140acd202ffd88823886c9","status":"affected","lessThan":"2619b47a0c8114eef980a56ade7e3ef4b58eb384","versionType":"git"},{"version":"97730bbb242cde22b7140acd202ffd88823886c9","status":"affected","lessThan":"92f41769e5fd16bcd9ba97500d0517332e0a5b45","versionType":"git"},{"version":"97730bbb242cde22b7140acd202ffd88823886c9","status":"affected","lessThan":"15432f19562fdb9199cce6d9fc24db12c71ed574","versionType":"git"},{"version":"97730bbb242cde22b7140acd202ffd88823886c9","status":"affected","lessThan":"896df22ee57648b0c505bd76ddbc6b2341834696","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/base/firmware_loader/sysfs_upload.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/base/firmware_loader/sysfs_upload.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/517676ec7dfca064e08f94007a4abd21969de0a0"},{"url":"https://git.kernel.org/stable/c/46d403da376a8b7c1187193294953816e1a8d7fe"},{"url":"https://git.kernel.org/stable/c/2619b47a0c8114eef980a56ade7e3ef4b58eb384"},{"url":"https://git.kernel.org/stable/c/92f41769e5fd16bcd9ba97500d0517332e0a5b45"},{"url":"https://git.kernel.org/stable/c/15432f19562fdb9199cce6d9fc24db12c71ed574"},{"url":"https://git.kernel.org/stable/c/896df22ee57648b0c505bd76ddbc6b2341834696"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:54:27.297Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}