What’s Vulnerable › Vulnerabilities

CVE-2026-98339: wifi: cfg80211: don't filter by BSS type when removing stale entries

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-06 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: don't filter by BSS type when removing stale entries When an assoc AP switches to a channel that already has a BSS entry, cfg80211_update_assoc_bss_entry() removes that entry before rehashing the real one, since the two would otherwise collide in the BSS rbtree. The lookup for that entry also required it to match the connection's BSS type, so an entry advertising e.g. the IBSS capability bit was left in place, and the following cfg80211_rehash_bss() then ran into it: WARN_ON(!cmp) Changing the type shouldn't really happen, but can be triggered by a rogue AP/device, so drop the check and remove any entries matching the comparison.

Affected products

• Linux kernel: 5.4 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0aa44982125c86b47961be5ac1c82eddab8080f3
• https://git.kernel.org/stable/c/1380ee3a202dbb9f8e8b3c3b87eb410450d57799
• https://git.kernel.org/stable/c/64e23a36d8f04811372365b44cfca325f8e0f4bb
• https://git.kernel.org/stable/c/65fdb973bd905bc3f5cb045a04c1828f2d2a7e24
• https://git.kernel.org/stable/c/6d2fd26185678038ef2ea11dd4d2e6eccbf2dd25
• https://git.kernel.org/stable/c/6ef87a853327434ae1cd9c5a2c27a557fb4047fc
• https://git.kernel.org/stable/c/b377e1000d963e7182a987082b4b06580bd7ac84
• https://git.kernel.org/stable/c/fb445ec7480da5d2b82bf681e3b4313603722729

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