Out-of-bounds read in Linux kernel - CVE-2026-64276

Vulnerability identifier: #VU139705

CSH Severity: Low

CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-64276

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service or disclose sensitive information.

The vulnerability exists due to out-of-bounds read and out-of-bounds write in the rmi_f30_attention handler and EVIOCGKEYCODE/EVIOCSKEYCODE ioctl handling in the synaptics-rmi4 F30 driver when processing a device that reports a gpioled_count greater than 6 with GPIO support enabled. A local user can trigger the attention interrupt or use EVIOCGKEYCODE/EVIOCSKEYCODE ioctls to cause a denial of service or disclose sensitive information.

The issue occurs because the keymap allocation is smaller than the gpioled_count value used for iteration and keycode bounds.

Linux kernel
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
openEuler
Ubuntu
kernel (Red Hat package)
kernel-rt (Red Hat package)
bpftool
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-source
kernel-headers
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
kernel
kernel-tools
linux (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel (Red Hat package) - addressed in versions 4.18.0-553.158.1.el8_10, 5.14.0-687.42.1.el9_8, 6.12.0-211.50.1.el10_2
kernel-rt (Red Hat package) - update to 4.18.0-553.158.1.rt7.499.el8_10
bpftool - update to 5.10.0-329.0.0.230
python3-perf-debuginfo - update to 5.10.0-329.0.0.230
python3-perf - update to 5.10.0-329.0.0.230
perf-debuginfo - update to 5.10.0-329.0.0.230
perf - update to 5.10.0-329.0.0.230
kernel-tools-devel - update to 5.10.0-329.0.0.230
kernel-tools-debuginfo - update to 5.10.0-329.0.0.230
kernel-source - update to 5.10.0-329.0.0.230
kernel-headers - update to 5.10.0-329.0.0.230
kernel-devel - update to 5.10.0-329.0.0.230
kernel-debugsource - update to 5.10.0-329.0.0.230
kernel-debuginfo - update to 5.10.0-329.0.0.230
bpftool-debuginfo - update to 5.10.0-329.0.0.230
kernel - update to 5.10.0-329.0.0.230
kernel-tools - update to 5.10.0-329.0.0.230
linux (Ubuntu package) - addressed in versions 7.0.0-31.31, 7.0.0-31.31.1, 7.0.0-31.31~24.04.1, 7.0.0-1006.7, 7.0.0-1011.11~24.04.1, 7.0.0-1012.12, 7.0.0-1012.12~24.04.1
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1013.13

• https://git.kernel.org/stable/c/26c895928d7118436a24f564587cb4aefc40cdd8
• https://git.kernel.org/stable/c/4e3689c26854356f41fbaa1eafa382e58ac79e00
• https://git.kernel.org/stable/c/8c6d18d61bb6fe0e6edf848413391c590552e8a9
• https://git.kernel.org/stable/c/bfe622efecd4ff0a792d0ecd1a8dce535a902f50
• https://git.kernel.org/stable/c/d162a1ead7de404d8b41a093c83ed0db6487cded
• https://git.kernel.org/stable/c/d577e46785d45484b2ab7e7309c49b18764bf56c
• https://git.kernel.org/stable/c/e849c6f51e6877104c765da084e001ec37c8e119
• https://git.kernel.org/stable/c/f0be9eba946e9200b43265e0a748d38bd0a56954

• Out-of-bounds read in Linux kernel input rmi4 driver
• openEuler 22.03 LTS SP4 update for kernel
• Red Hat Enterprise Linux 9 update for kernel
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 8 update for kernel
• Red Hat Enterprise Linux 10 update for kernel
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux
• Ubuntu update for linux-gcp-7.0