SB20261022309 - Use-after-free in Linux kernel mac80211

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-98704)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker on the local network to potentially cause a denial of service by triggering access to freed kernel memory during wireless association.

The vulnerability exists due to use-after-free in the Linux kernel mac80211 ieee80211_assoc_config_link() function when associating with a non-transmitted MBSSID profile using an association response that omits WMM, HT, or VHT information. Pointers copied from the fallback parse reference merged-profile storage that is freed before channel, bandwidth, and HT capability configuration finishes. A remote attacker on the local network can supply a specially crafted association response to trigger reads through these dangling pointers and potentially crash the kernel.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0878594c5806dd29fa5e16cc026ce19158afdad2
• https://git.kernel.org/stable/c/1d9644753d46c86b4e5c05bd6d9d35339ea27331
• https://git.kernel.org/stable/c/a10a2f80476d166fd81c361ec0319493671b694e
• https://git.kernel.org/stable/c/d0183cd1f6a2dba9e63be20af2f65093c9c8d121
• https://git.kernel.org/stable/c/de77b0f68142147e74fac1c497dbe1f93daeeed9