SB20261022303 - Improper Check for Unusual or Exceptional Conditions in Linux kernel mac80211

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-98698)

CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service by triggering a kernel failure.

The vulnerability exists due to improper handling of zero-length allocations in mac80211 AES-SIV encryption when processing an association or reassociation request ending with a FILS Session element. A local user can trigger encryption of such a request to cause an invalid page to be placed in a scatterlist, triggering a kernel BUG when CONFIG_DEBUG_SG is enabled and potentially causing a denial of service otherwise.

Remediation

Install update from vendor's website.

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