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CVE-2026-98698

Linux: wifi: mac80211: handle empty FILS association request payload

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.17%Chance of exploitation activity in the next 30 days, higher than 5% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in0b1e4a7eeb6a301ee33bd318982927cbdbae9f36Also 2f5b62f6534d336a62fdb9e88b186dd70b4323ef, 452f1c9b76f7a122bbc4630b9691bda4809677c4 and 2 moreCVE List
Published18 Oct 2026Updated 21 Oct 2026CVE List

What fixes it

  • 0b1e4a7eeb6a301ee33bd318982927cbdbae9f36LinuxCVE List
  • 2f5b62f6534d336a62fdb9e88b186dd70b4323efLinuxCVE List
  • 452f1c9b76f7a122bbc4630b9691bda4809677c4LinuxCVE List
  • 20f939b0c151d1d28e6b62a76b2454fa6fe877f2LinuxCVE List
  • 5bfd4b0b40b79781d900cb2f7da0685070f53c67LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 12

  • Linuxaffected: 39404feee691a2dc524a629ed6eb5cfe5d8898d1 before 0b1e4a7eeb6a301ee33bd318982927cbdbae9f36CVE List
  • Linuxaffected: 39404feee691a2dc524a629ed6eb5cfe5d8898d1 before 2f5b62f6534d336a62fdb9e88b186dd70b4323efCVE List
  • Linuxaffected: 39404feee691a2dc524a629ed6eb5cfe5d8898d1 before 452f1c9b76f7a122bbc4630b9691bda4809677c4CVE List
  • Linuxaffected: 39404feee691a2dc524a629ed6eb5cfe5d8898d1 before 20f939b0c151d1d28e6b62a76b2454fa6fe877f2CVE List
  • Linuxaffected: 39404feee691a2dc524a629ed6eb5cfe5d8898d1 before 5bfd4b0b40b79781d900cb2f7da0685070f53c67CVE List
  • Linuxaffected: 4.10CVE List
  • Linuxunaffected: all versions before 4.10CVE List
  • Linuxunaffected: 6.6.160 through 6.6.*CVE List
  • Linuxunaffected: 6.12.113 through 6.12.*CVE List
  • Linuxunaffected: 6.18.56 through 6.18.*CVE List
  • Linuxunaffected: 7.2.10 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 5