SB20261022448 - Integer overflow in Linux kernel mac80211

Description

This security bulletin contains information about 1 vulnerability.

1) Integer overflow (CVE-ID: CVE-2026-98829)

CWE-ID: CWE-190 - Integer overflow

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 cause a denial of service by crashing the Linux kernel.

The vulnerability exists due to integer overflow in the Linux kernel mac80211 ieee80211_rx_h_defragment() function when accumulating payload lengths from oversized IEEE 802.11 fragments. A remote attacker on the local network can transmit a crafted fragment sequence whose accumulated payload length exceeds 65535 bytes to wrap the 16-bit entry->extra_len counter, resulting in insufficient buffer tailroom and a kernel panic when the queued payloads are appended.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5e4f3509793b4db2c0835340224743db680e861f
• https://git.kernel.org/stable/c/870b8cb9baa9bd859deceb33ae158011e6ba2360
• https://git.kernel.org/stable/c/9338b2dea74cb0fc80a4c958b68e687610ba2261