{
  "cveId": "CVE-2026-64574",
  "url": "https://patchblox.com/security/cve/CVE-2026-64574",
  "summary": "CVE-2026-64574 is fixed in 52 products on 1 platform, first by DEBIAN-CVE-2026-64574, released August 7, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "wifi: mac80211: tear down new links on vif update error path",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  wifi: mac80211: tear down new links on vif update error path  When ieee80211_vif_update_links() adds new links it allocates a link container for each and calls ieee80211_link_init() (which registers the per-link debugfs files with file-\u003Eprivate_data pointing into the container) and ieee80211_link_setup(). If the subsequent drv_change_vif_links() fails, the error path restores the old pointers and jumps to \u0027free\u0027, which frees the new containers but never removes their debugfs entries or stops the links. The debugfs files survive with file-\u003Eprivate_data dangling at the freed container, so a later open()\u002Bread() (e.g. link-1/txpower) dereferences freed memory in ieee80211_if_read_link(), a use-after-free.  The removal path already dismantles links correctly via ieee80211_tear_down_links(), which removes each link\u0027s keys and debugfs entries and calls ieee80211_link_stop(); the add path on the error branch does not. Commit be1ba9ed221f (\u0022wifi: mac80211: avoid weird state in error path\u0022) hardened this same error path for the link-removal case (new_links == 0) but left the newly-added links\u0027 teardown unaddressed.  drv_change_vif_links() can fail at runtime on MLO drivers (internal allocation / queue / firmware command failures).  Remove the new links\u0027 debugfs entries and stop them before freeing.    BUG: KASAN: slab-use-after-free in ieee80211_if_read_link (net/mac80211/debugfs_netdev.c:127)   Read of size 8 at addr ffff888011290000 by task exploit/145   Call Trace:    ...    ieee80211_if_read_link (net/mac80211/debugfs_netdev.c:127)    short_proxy_read (fs/debugfs/file.c:373)    vfs_read (fs/read_write.c:572)    ksys_read (fs/read_write.c:716)    do_syscall_64 (arch/x86/entry/syscall_64.c:94)    entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)   ...   Oops: general protection fault, probably for non-canonical address 0xdffffc000000000a   RIP: 0010:ieee80211_if_read_link (net/mac80211/debugfs_netdev.c:127)   Kernel panic - not syncing: Fatal exception",
  "published": "2026-08-05T08:16:37Z",
  "severity": "Moderate",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00157,
  "epssPercentile": 0.04851,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64574",
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