CVE-2026-98698

/// Technical 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References