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CVE-2026-68402— wifi: cfg80211: bound element ID read when checking non-inheritance

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基金会开源的一个操作系统内核。 Linux kernel 5.2版本存在安全漏洞，该漏洞源于cfg80211_is_element_inherited()函数在检查非继承元素时未验证元素是否包含数据八位字节，导致零长度扩展元素读取越界，可能触发slab-out-of-bounds读取。

CVSS 7.1 · High EPSS 0.27% · P17

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3< 521dd5fe6d12b0d3c275f919738dc3a07117f4a5 affected
f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3< 24154c172246ae3f0e69bb17c9111095685ceedc affected
f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3< 2d31ebb26a14f103c9cdc5287fb20cb2d4bde901 affected
f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3< 20c308d9a57722801961f816395bf825f7bde6bc affected
f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3< 84bd907361c56fbd5523eceb2682cb39da059bd5 affected
f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3< 11ac7a5e75f5132f1778e0c60981d30dc29fb869 affected
f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3< ddf2773bcc8e49a43c561f22ec1e7924215d7947 affected
f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3< cb8afea4655ff004fa7feee825d5c79783525383 affected
… +10 more rows
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I. Basic Information for CVE-2026-68402

Vulnerability Information
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Vulnerability Title
wifi: cfg80211: bound element ID read when checking non-inheritance
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: bound element ID read when checking non-inheritance cfg80211_is_element_inherited() reads the first data octet of the candidate element (id = elem->data[0]) to look it up in an extension non-inheritance list. It does so after testing elem->id, but without verifying that the element actually has a data octet. A zero-length extension element (WLAN_EID_EXTENSION with length 0) therefore makes it read one octet past the end of the element. _ieee802_11_parse_elems_full() runs this check for every element of a frame once a non-inheritance context exists -- e.g. while parsing a per-STA profile of a Multi-Link element in a (re)association response, or a non-transmitted BSS profile -- so a crafted frame from an AP can trigger a one-octet slab-out-of-bounds read during element parsing: BUG: KASAN: slab-out-of-bounds in cfg80211_is_element_inherited Read of size 1 ... in net/wireless/scan.c Return early (treat the element as inherited) when an extension element carries no data, mirroring the existing handling of empty ID lists. The bug was found by fuzzing ieee802_11_parse_elems_full() under KASAN.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/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基金会开源的一个操作系统内核。 Linux kernel 5.2版本存在安全漏洞，该漏洞源于cfg80211_is_element_inherited()函数在检查非继承元素时未验证元素是否包含数据八位字节，导致零长度扩展元素读取越界，可能触发slab-out-of-bounds读取。
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 f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3 ~ 521dd5fe6d12b0d3c275f919738dc3a07117f4a5 -
Linux Linux 5.2 -

II. Public POCs for CVE-2026-68402

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III. Intelligence Information for CVE-2026-68402

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Patches & Fixes for CVE-2026-68402 (7)

Same Patch Batch · Linux · 2026-08-10 · 344 CVEs total

CVE-2026-68158 9.8 CRITICAL libceph: Fix multiplication overflow in decode_new_up_state_weight()
CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68156 9.8 CRITICAL libceph: refresh auth->authorizer_buf{,_len} after authorizer update
CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
CVE-2026-68124 9.6 CRITICAL mctp: serial: handle zero-length frames to prevent rx buffer overflow

Showing top 20 of 344 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68402

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