{"id":"CVE-2026-72391","summary":"net: phy: sfp: free mii_bus in sfp_i2c_mdiobus_destroy","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: phy: sfp: free mii_bus in sfp_i2c_mdiobus_destroy\n\nsfp_i2c_mdiobus_create() allocates the I2C MDIO bus with mdio_i2c_alloc(),\na plain (non-devm) allocation, and registers it. sfp_i2c_mdiobus_destroy()\nonly unregisters the bus and clears sfp-\u003ei2c_mii without calling\nmdiobus_free(). As the only reference to the bus is then cleared, the\nstruct mii_bus is leaked.\n\nThis is hit whenever a copper/RollBall SFP module that instantiated an MDIO\nbus is removed: sfp_sm_main() takes the global teardown path and calls\nsfp_i2c_mdiobus_destroy(). sfp_cleanup(), on driver unbind, frees\nsfp-\u003ei2c_mii directly, which is why the leak only triggered on module\nhot-removal and not on unbind.\n\nFree the bus in sfp_i2c_mdiobus_destroy() to match the allocation done in\nsfp_i2c_mdiobus_create().","modified":"2026-08-18T03:31:05.367030050Z","published":"2026-08-15T05:56:19.842Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72391.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2381bf3f484e8e4fd89a225445872ec14e036ab5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3183b6f5510c876a1c4b4a6bdc3d0ad8940fe742"},{"type":"WEB","url":"https://git.kernel.org/stable/c/86d379fcf1b79bdf4bc2ac891297f30f63d041d8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8f31efff9206f9f0adb853cad6916086aac4d5ef"},{"type":"WEB","url":"https://git.kernel.org/stable/c/92dd9a522f01ef57f633a8c1953cf6d48ef2bcd5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d2c37f26d1a37f8177be5f354537f8ee3ec31cc2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72391.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72391"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e85b1347ace677c3822c12d9332dfaaffe594da6"},{"fixed":"92dd9a522f01ef57f633a8c1953cf6d48ef2bcd5"},{"fixed":"d2c37f26d1a37f8177be5f354537f8ee3ec31cc2"},{"fixed":"3183b6f5510c876a1c4b4a6bdc3d0ad8940fe742"},{"fixed":"86d379fcf1b79bdf4bc2ac891297f30f63d041d8"},{"fixed":"2381bf3f484e8e4fd89a225445872ec14e036ab5"},{"fixed":"8f31efff9206f9f0adb853cad6916086aac4d5ef"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72391.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.1.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72391.json"}}],"schema_version":"1.9.0"}