CVE-2026-68402: wifi: cfg80211: bound element ID read when checking non-inheritance
Vulnerability summary
CVE-2026-68402 is a high (CVSS 7.1) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 18.5% of scored vulnerabilities.
Not severe (CVSS 7.1, adjacent network); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 29 · Related 26Timeline
- 10-08-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.1HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.1HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- NVDNIST7.1HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
EPSS trend
Probability
0.27%
Chance of exploitation in the next 30 days
Percentile
19%
Versus all other CVEs
30-day change
Decrease -0.14 pp
From 0.40% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: adjacent network, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu165 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-38.38
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1014.14
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.187-1 | < 6.12.101-1 | < 7.1.6-1
- linux-6.12< 6.12.101-1~deb12u1
Linux1 product
- linux≥ f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3, < 521dd5fe6d12b0d3c275f919738dc3a07117f4a5 | ≥ f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3, < 24154c172246ae3f0e69bb17c9111095685ceedc | ≥ f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3, < 2d31ebb26a14f103c9cdc5287fb20cb2d4bde901 | ≥ f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3, < 20c308d9a57722801961f816395bf825f7bde6bc | ≥ f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3, < 84bd907361c56fbd5523eceb2682cb39da059bd5 | ≥ f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3, < 11ac7a5e75f5132f1778e0c60981d30dc29fb869 | ≥ f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3, < ddf2773bcc8e49a43c561f22ec1e7924215d7947 | ≥ f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3, < cb8afea4655ff004fa7feee825d5c79783525383 | 5.2
3 vendors · 168 products
