SB20261022446 - Out-of-bounds write in Linux kernel ath ath9k driver

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: CVE-2026-98827)

CWE-ID: CWE-787 - Out-of-bounds write

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 corrupt kernel memory and potentially cause a denial of service.

The vulnerability exists due to an out-of-bounds write in the ath9k_htc driver's __hif_usb_tx() function when aggregating outgoing frames without checking their cumulative byte length against the transmit buffer capacity. A local user can trigger aggregation of large outgoing frames to exceed the 32768-byte buffer and corrupt kernel memory, potentially causing a denial of service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/345ce265cf604e84b5b560c21beaf4c6f269ab14
• https://git.kernel.org/stable/c/aeaca27c1db3106967ffbb2b517d98c835f6d500
• https://git.kernel.org/stable/c/c18882768a0fe253c70986c5fe66d9241570fbc4
• https://git.kernel.org/stable/c/e73a619f91b6cfec47bc1a94aea28df6849e5be3