Out-of-bounds write in Linux kernel - CVE-2026-98703

Vulnerability identifier: #VU157043

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98703

CWE-ID: CWE-787

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to corrupt kernel memory and potentially cause a denial of service.

The vulnerability exists due to an out-of-bounds write in the Linux kernel mac80211 minstrel_ht rate-control component when processing an invalid fixed rate index supplied through the fixed_rate_idx debugfs file. A local privileged user can write a value such as 65535 to select group 4095 and rate index 15, causing minstrel_ht_set_rate() to access and update rate statistics outside the valid arrays and corrupt adjacent kernel memory.

Linux kernel
SUSE Linux Micro
SUSE Linux Micro Extras
kernel-default
kernel-64kb
kernel-64kb-debugsource
kernel-64kb-devel
kernel-default-devel
kernel-syms
kernel-obs-build
kernel-obs-build-debugsource
kernel-default-debugsource
kernel-default-devel-debuginfo

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-default - update to 6.4.0-159998.55.1
kernel-64kb - update to 6.4.0-159998.55.1
kernel-64kb-debugsource - update to 6.4.0-159998.55.1
kernel-64kb-devel - update to 6.4.0-159998.55.1
kernel-default-devel - update to 6.4.0-159998.55.1
kernel-syms - update to 6.4.0-159998.55.1
kernel-obs-build - update to 6.4.0-159998.55.1
kernel-obs-build-debugsource - update to 6.4.0-159998.55.1
kernel-default-debugsource - update to 6.4.0-159998.55.1
kernel-default-devel-debuginfo - update to 6.4.0-159998.55.1

• https://git.kernel.org/stable/c/15fb9e3cea55fbc378261ce35a32b0f8828f0000
• https://git.kernel.org/stable/c/42aa9feb27b600809414a3c6b0c650bafba542a9
• https://git.kernel.org/stable/c/43082d604a9937b94ceb2e484403956d0f363324
• https://git.kernel.org/stable/c/eebc70f132041b35da9ec74d5d395083125289b2
• https://git.kernel.org/stable/c/f8ab6ae1fa360b0191252677f41e781dcb0ffe6e

• Out-of-bounds write in Linux kernel mac80211
• SUSE update for the Linux Kernel