SB2026080624 - Double free in Linux kernel mac80211

Description

This security bulletin contains information about 1 vulnerability.

1) Double free (CVE-ID: CVE-2026-64570)

CWE-ID: CWE-415 - Double Free

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.

The vulnerability exists due to double free in ieee80211_set_fils_discovery() when handling FILS discovery template updates after an allocation failure. A local user can trigger an allocation failure and cause the same object to be queued for freeing multiple times to cause a denial of service.

The issue is triggered when a later update or AP teardown re-queues an object that still points to memory already scheduled for RCU freeing.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1981fba71797ec95e6755fb882cad88899a2a84f
• https://git.kernel.org/stable/c/286e52a799fa158bdbd77da1426c4d93f9a6e7ad
• https://git.kernel.org/stable/c/5baaa1042f71dd4b8e418f2cdd516808702d229b
• https://git.kernel.org/stable/c/e2c55079155a953db669ca1986a985fa286bad95