{"id":"CVE-2026-64574","summary":"wifi: mac80211: tear down new links on vif update error path","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: tear down new links on vif update error path\n\nWhen ieee80211_vif_update_links() adds new links it allocates a link\ncontainer for each and calls ieee80211_link_init() (which registers the\nper-link debugfs files with file-\u003eprivate_data pointing into the container)\nand ieee80211_link_setup(). If the subsequent drv_change_vif_links() fails,\nthe error path restores the old pointers and jumps to 'free', which frees\nthe new containers but never removes their debugfs entries or stops the\nlinks. The debugfs files survive with file-\u003eprivate_data dangling at the\nfreed container, so a later open()+read() (e.g. link-1/txpower)\ndereferences freed memory in ieee80211_if_read_link(), a use-after-free.\n\nThe removal path already dismantles links correctly via\nieee80211_tear_down_links(), which removes each link's keys and debugfs\nentries and calls ieee80211_link_stop(); the add path on the error branch\ndoes not. Commit be1ba9ed221f (\"wifi: mac80211: avoid weird state in error\npath\") hardened this same error path for the link-removal case\n(new_links == 0) but left the newly-added links' teardown unaddressed.\n\ndrv_change_vif_links() can fail at runtime on MLO drivers (internal\nallocation / queue / firmware command failures).\n\nRemove the new links' debugfs entries and stop them before freeing.\n\n  BUG: KASAN: slab-use-after-free in ieee80211_if_read_link (net/mac80211/debugfs_netdev.c:127)\n  Read of size 8 at addr ffff888011290000 by task exploit/145\n  Call Trace:\n   ...\n   ieee80211_if_read_link (net/mac80211/debugfs_netdev.c:127)\n   short_proxy_read (fs/debugfs/file.c:373)\n   vfs_read (fs/read_write.c:572)\n   ksys_read (fs/read_write.c:716)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n  ...\n  Oops: general protection fault, probably for non-canonical address 0xdffffc000000000a\n  RIP: 0010:ieee80211_if_read_link (net/mac80211/debugfs_netdev.c:127)\n  Kernel panic - not syncing: Fatal exception","modified":"2026-08-07T03:45:37.180253928Z","published":"2026-08-05T08:08:10.272Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64574.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0f7eaeb950adb77f71beb546e5ab30f90b41fe6f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/329589417214d3b7221432e5b266ed2bba7ff674"},{"type":"WEB","url":"https://git.kernel.org/stable/c/901a73523e093beff123b54b1ceaf3113f18acc9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/952c02b33f56207a160421bcd61e7ac53c9c59ae"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c57d97f381306bbfba174e8f708419e007824e0c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64574.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64574"},{"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":"170cd6a66d9a164180eb4dc72d50afa6ce1ce566"},{"fixed":"329589417214d3b7221432e5b266ed2bba7ff674"},{"fixed":"c57d97f381306bbfba174e8f708419e007824e0c"},{"fixed":"0f7eaeb950adb77f71beb546e5ab30f90b41fe6f"},{"fixed":"901a73523e093beff123b54b1ceaf3113f18acc9"},{"fixed":"952c02b33f56207a160421bcd61e7ac53c9c59ae"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64574.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.4.0"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64574.json"}}],"schema_version":"1.8.0"}