What’s Vulnerable › Vulnerabilities

CVE-2026-98698: wifi: mac80211: handle empty FILS association request payload

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-18 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: handle empty FILS association request payload fils_encrypt_assoc_req() accepts a (Re)Association Request frame whose last element is the FILS Session element. crypt_len is then zero and aes_siv_encrypt() is called with an empty plaintext. kmemdup() returns ZERO_SIZE_PTR for a zero-length allocation, so the unconditional sg_init_one() puts an invalid page into the scatterlist. With CONFIG_DEBUG_SG this triggers a kernel BUG in sg_set_buf(); without the debug check the bogus page is handed to the crypto backend. AES-SIV is defined for empty plaintext and the S2V result is then the complete output, so handle this case before the CTR step, which has nothing to encrypt.

Affected products

• Linux: 4.10 — fixed in 7.3

How to fix

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

References

• https://git.kernel.org/stable/c/0b1e4a7eeb6a301ee33bd318982927cbdbae9f36
• https://git.kernel.org/stable/c/20f939b0c151d1d28e6b62a76b2454fa6fe877f2
• https://git.kernel.org/stable/c/2f5b62f6534d336a62fdb9e88b186dd70b4323ef
• https://git.kernel.org/stable/c/452f1c9b76f7a122bbc4630b9691bda4809677c4
• https://git.kernel.org/stable/c/5bfd4b0b40b79781d900cb2f7da0685070f53c67
• https://git.kernel.org/stable/c/ce70c87252a14020cb40032efe208efc6e61b1ee
• https://git.kernel.org/stable/c/d8c5dbbf584a1baaa008988ac64dd4495f7086bd
• https://git.kernel.org/stable/c/de3297c8e521c0b0ddc89ece6fee84e25da9ecf0

Get alerted when CVE-2026-98698 or the next vulnerability affects your stack