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CVE-2026-64574— wifi: mac80211: tear down new links on vif update error path

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 6.4版本存在安全漏洞，该漏洞源于ieee80211_vif_update_links()在drv_change_vif_links()失败时未移除新链接的debugfs条目或停止链接，导致释放后重用，可能造成信息泄露或内核崩溃。

CVSS 7.8 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 170cd6a66d9a164180eb4dc72d50afa6ce1ce566< 329589417214d3b7221432e5b266ed2bba7ff674 affected
170cd6a66d9a164180eb4dc72d50afa6ce1ce566< c57d97f381306bbfba174e8f708419e007824e0c affected
170cd6a66d9a164180eb4dc72d50afa6ce1ce566< 0f7eaeb950adb77f71beb546e5ab30f90b41fe6f affected
170cd6a66d9a164180eb4dc72d50afa6ce1ce566< 901a73523e093beff123b54b1ceaf3113f18acc9 affected
170cd6a66d9a164180eb4dc72d50afa6ce1ce566< 952c02b33f56207a160421bcd61e7ac53c9c59ae affected
6.4 affected
< 6.4 unaffected
6.6.148≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-64574

Vulnerability Information
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Vulnerability Title
wifi: mac80211: tear down new links on vif update error path
Source: CVE Program / CVE List V5
Vulnerability 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->private_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 'free', which frees the new containers but never removes their debugfs entries or stops the links. The debugfs files survive with file->private_data dangling at the freed container, so a later open()+read() (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's keys and debugfs entries and calls ieee80211_link_stop(); the add path on the error branch does not. Commit be1ba9ed221f ("wifi: mac80211: avoid weird state in error path") hardened this same error path for the link-removal case (new_links == 0) but left the newly-added links' teardown unaddressed. drv_change_vif_links() can fail at runtime on MLO drivers (internal allocation / queue / firmware command failures). Remove the new links' 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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 6.4版本存在安全漏洞，该漏洞源于ieee80211_vif_update_links()在drv_change_vif_links()失败时未移除新链接的debugfs条目或停止链接，导致释放后重用，可能造成信息泄露或内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 170cd6a66d9a164180eb4dc72d50afa6ce1ce566 ~ 329589417214d3b7221432e5b266ed2bba7ff674 -
Linux Linux 6.4 -

II. Public POCs for CVE-2026-64574

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III. Intelligence Information for CVE-2026-64574

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Patches & Fixes for CVE-2026-64574 (4)

Same Patch Batch · Linux · 2026-08-05 · 17 CVEs total

CVE-2026-64566 9.8 CRITICAL xfrm: iptfs: propagate SKBFL_SHARED_FRAG in iptfs_skb_add_frags()
CVE-2026-64578 8.2 HIGH ksmbd: validate compound request size before reading StructureSize2
CVE-2026-64567 7.8 HIGH btrfs: reject free space cache with more entries than pages
CVE-2026-64568 7.8 HIGH wifi: mac80211: fix unsol_bcast_probe_resp double free on alloc failure
CVE-2026-64570 7.8 HIGH wifi: mac80211: fix fils_discovery double free on alloc failure
CVE-2026-64575 7.8 HIGH bpf: tcp: fix double sock release on batch realloc
CVE-2026-64580 7.8 HIGH xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()
CVE-2026-64581 7.8 HIGH xfrm: fix sk_dst_cache double-free in xfrm_user_policy()
CVE-2026-64582 7.8 HIGH RDMA/rxe: Fix a use-after-free problem in rxe_mmap
CVE-2026-64577 7.5 HIGH gtp: check skb_pull_data() return in gtp1u_send_echo_resp()
CVE-2026-64576 7.1 HIGH nexthop: initialize extack in nh_res_bucket_migrate()
CVE-2026-64569 mpls: fix NULL deref in mpls_valid_fib_dump_req() on CONFIG_INET=n
CVE-2026-64571 wifi: p54: validate RX frame length in p54_rx_eeprom_readback()
CVE-2026-64572 ipv4: fib: free fib_alias with kfree_rcu() on insert error path
CVE-2026-64573 Bluetooth: qca: fix NVM tag length underflow in TLV parser
CVE-2026-64579 xfrm: policy: preallocate inexact bins before xfrm_hash_rebuild reinsert

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64574

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