{"id":"CVE-2026-53234","summary":"net: ibm: emac: Fix use-after-free during device removal","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ibm: emac: Fix use-after-free during device removal\n\nThe driver was using devm_register_netdev() which causes unregister_netdev()\nto be deferred until the devres cleanup phase, which runs after emac_remove()\nreturns. This creates a use-after-free window where:\n\n1. emac_remove() is called, which tears down hardware (cancels work, detaches\n   modules, unregisters from MAL)\n2. emac_remove() returns\n3. devres cleanup runs and finally calls unregister_netdev()\n\nDuring step 3, the network stack might still process packets, triggering\nemac_irq(), emac_poll(), or other handlers that access now-freed hardware\nresources (dev-\u003eemacp, dev-\u003emal, etc.).\n\nFix this by replacing devm_register_netdev() with manual register_netdev()\nand calling unregister_netdev() at the beginning of emac_remove(), before\nany hardware teardown. This ensures the network device is fully stopped and\nunregistered before hardware resources are released.\n\nThe change is safe because:\n- dev-\u003endev is assigned very early in probe (before any error paths that\n  could bypass emac_remove)\n- platform_set_drvdata() is only called after successful registration, so\n  emac_remove() only runs for fully registered devices\n- unregister_netdev() is idempotent and safe to call on any registered device","modified":"2026-07-10T03:53:55.571677362Z","published":"2026-06-25T08:39:31.852Z","related":["CGA-3qhh-8gwx-rrgp"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53234.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/a0130d682222ae21afc395aead7cd2d87e1a8358"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c09c2e236eef6f59e105f38a30f5439e6ccbcad7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c12584cd6078085d707266be864e7e1cc91d74e3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cf8e14db93eaecc4c0c58299be3b3183b0e53ed5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53234.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53234"},{"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":"a4dd8535a527061a01f2fd335596fa77ca240a96"},{"fixed":"cf8e14db93eaecc4c0c58299be3b3183b0e53ed5"},{"fixed":"c09c2e236eef6f59e105f38a30f5439e6ccbcad7"},{"fixed":"c12584cd6078085d707266be864e7e1cc91d74e3"},{"fixed":"a0130d682222ae21afc395aead7cd2d87e1a8358"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53234.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.12.0"},{"fixed":"6.12.94"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.36"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53234.json"}}],"schema_version":"1.7.5"}