{"id":"CVE-2021-47416","state":"PUBLISHED","title":"phy: mdio: fix memory leak","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nphy: mdio: fix memory leak\n\nSyzbot reported memory leak in MDIO bus interface, the problem was in\nwrong state logic.\n\nMDIOBUS_ALLOCATED indicates 2 states:\n\t1. Bus is only allocated\n\t2. Bus allocated and __mdiobus_register() fails, but\n\t   device_register() was called\n\nIn case of device_register() has been called we should call put_device()\nto correctly free the memory allocated for this device, but mdiobus_free()\ncalls just kfree(dev) in case of MDIOBUS_ALLOCATED state\n\nTo avoid this behaviour we need to set bus->state to MDIOBUS_UNREGISTERED\n_before_ calling device_register(), because put_device() should be\ncalled even in case of device_register() failure.","publishedAt":"2024-05-21T15:04:06.042Z","updatedAt":"2026-05-11T13:54:16.957Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"46abc02175b3c246dd5141d878f565a8725060c9","status":"affected","lessThan":"25e9f88c7e3cc35f5e3d3db199660d28a15df639","versionType":"git"},{"version":"46abc02175b3c246dd5141d878f565a8725060c9","status":"affected","lessThan":"2250392d930bd0d989f24d355d6355b0150256e7","versionType":"git"},{"version":"46abc02175b3c246dd5141d878f565a8725060c9","status":"affected","lessThan":"f4f502a04ee1e543825af78f47eb7785015cd9f6","versionType":"git"},{"version":"46abc02175b3c246dd5141d878f565a8725060c9","status":"affected","lessThan":"2397b9e118721292429fea8807a698e71b94795f","versionType":"git"},{"version":"46abc02175b3c246dd5141d878f565a8725060c9","status":"affected","lessThan":"414bb4ead1362ef2c8592db723c017258f213988","versionType":"git"},{"version":"46abc02175b3c246dd5141d878f565a8725060c9","status":"affected","lessThan":"0d2dd40a7be61b89a7c99dae8ee96389d27b413a","versionType":"git"},{"version":"46abc02175b3c246dd5141d878f565a8725060c9","status":"affected","lessThan":"064c2616234a7394867c924b5c1303974f3a4f4d","versionType":"git"},{"version":"46abc02175b3c246dd5141d878f565a8725060c9","status":"affected","lessThan":"ca6e11c337daf7925ff8a2aac8e84490a8691905","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/phy/mdio_bus.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.28","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.28","versionType":"semver"},{"version":"4.4.289","status":"unaffected","lessThanOrEqual":"4.4.*","versionType":"semver"},{"version":"4.9.287","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.251","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.211","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.153","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.73","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.14.12","status":"unaffected","lessThanOrEqual":"5.14.*","versionType":"semver"},{"version":"5.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/phy/mdio_bus.c"]}],"references":["https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639","https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7","https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6","https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f","https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988","https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413a","https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4d","https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47416.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47416","state":"PUBLISHED","datePublished":"2024-05-21T15:04:06.042Z","dateUpdated":"2026-05-11T13:54:16.957Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-21T14:58:30.818Z"},"containers":{"cna":{"title":"phy: mdio: fix memory leak","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nphy: mdio: fix memory leak\n\nSyzbot reported memory leak in MDIO bus interface, the problem was in\nwrong state logic.\n\nMDIOBUS_ALLOCATED indicates 2 states:\n\t1. 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