Out-of-bounds write in Linux kernel - CVE-2026-89864

Vulnerability identifier: #VU150421

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-2026-89864

CWE-ID: CWE-787

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to corrupt kernel heap and stack memory.

The vulnerability exists due to improper bounds checking in the qla2x00_write_i2c() and qla2x00_read_i2c() I2C BSG handlers when processing a user-supplied I2C length. A local privileged user can submit a crafted I2C BSG request with an oversized length to corrupt kernel heap and stack memory.

Exploitation requires CAP_SYS_RAWIO.

Linux kernel
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
Debian Linux
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Micro Extras
SUSE Linux Micro
SUSE Linux Enterprise Live Patching
Ubuntu
linux (Ubuntu package)
linux-kvm (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-azure (Ubuntu package)
linux-oracle (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-gke (Ubuntu package)
linux-aws-5.15 (Ubuntu package)
linux-lowlatency-hwe-5.15 (Ubuntu package)
linux-hwe-5.15 (Ubuntu package)
linux-fips (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
linux-ibm-5.15 (Ubuntu package)
linux-nvidia-tegra-igx (Ubuntu package)
linux-gkeop (Ubuntu package)
linux-realtime (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-azure-fde-5.15 (Ubuntu package)
linux-intel-iotg (Ubuntu package)
linux-ibm (Ubuntu package)
linux-intel-iotg-5.15 (Ubuntu package)
linux-oracle-5.15 (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
kgraft-patch-4_12_14-122_339-default
dlm-kmp-default
gfs2-kmp-default
cluster-md-kmp-default
ocfs2-kmp-default
kernel-default-devel-debuginfo
kernel-source
kernel-macros
gfs2-kmp-default-debuginfo
kernel-devel
kernel-default-man
kernel-default-base
kernel-default-base-debuginfo
kernel-default-devel
dlm-kmp-default-debuginfo
kernel-syms
ocfs2-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
kernel-default-kgraft-devel
kernel-default-kgraft
kernel-default-debugsource
kernel-default
kernel-default-debuginfo
kernel-obs-build-debugsource
kernel-64kb
kernel-obs-build
kernel-64kb-debugsource
kernel-64kb-devel
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 5.15.0-202.212, 7.0.0-42.42
linux-kvm (Ubuntu package) - update to 5.15.0-1111.116
linux-aws (Ubuntu package) - addressed in versions 5.15.0-1119.126, 7.0.0-1016.17
linux-gcp (Ubuntu package) - addressed in versions 5.15.0-1120.130, 7.0.0-1016.18
linux-azure (Ubuntu package) - update to 5.15.0-1125.134
linux-oracle (Ubuntu package) - addressed in versions 5.15.0-1116.122, 7.0.0-1015.16
linux-lowlatency (Ubuntu package) - update to 5.15.0-197.207
linux-gke (Ubuntu package) - update to 5.15.0-1115.121
linux-aws-5.15 (Ubuntu package) - update to 5.15.0-1119.126~20.04.1
linux-lowlatency-hwe-5.15 (Ubuntu package) - update to 5.15.0-197.207~20.04.1
linux-hwe-5.15 (Ubuntu package) - update to 5.15.0-202.212~20.04.1
linux-fips (Ubuntu package) - update to 5.15.0-202.212+fips1
linux-azure-5.15 (Ubuntu package) - update to 5.15.0-1125.134~20.04.1
linux-ibm-5.15 (Ubuntu package) - update to 5.15.0-1113.117~20.04.1
linux-nvidia-tegra-igx (Ubuntu package) - update to 5.15.0-1059.59
linux-gkeop (Ubuntu package) - update to 5.15.0-1102.110
linux-realtime (Ubuntu package) - update to 5.15.0-1118.127
linux-nvidia-tegra (Ubuntu package) - update to 5.15.0-1070.72
linux-nvidia (Ubuntu package) - update to 5.15.0-1114.115
linux-azure-fde-5.15 (Ubuntu package) - update to 5.15.0-1124.133~20.04.1
linux-intel-iotg (Ubuntu package) - update to 5.15.0-1114.120
linux-ibm (Ubuntu package) - addressed in versions 5.15.0-1113.117, 7.0.0-1017.17
linux-intel-iotg-5.15 (Ubuntu package) - update to 5.15.0-1114.120~20.04.1
linux-oracle-5.15 (Ubuntu package) - update to 5.15.0-1116.122~20.04.1
linux-gcp-5.15 (Ubuntu package) - update to 5.15.0-1120.130~20.04.1
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1070.72~20.04.1
linux-azure-fde (Ubuntu package) - update to 5.15.0-1124.133
linux-intel-iot-realtime (Ubuntu package) - update to 5.15.0-1111.115
linux-gcp-fips (Ubuntu package) - update to 5.15.0-1120.130+fips1
linux-aws-fips (Ubuntu package) - update to 5.15.0-1119.126+fips1
linux-azure-fips (Ubuntu package) - update to 5.15.0-1125.134+fips1
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
kgraft-patch-4_12_14-122_339-default - update to 1-8.3.1
dlm-kmp-default - update to 4.12.14-122.339.1
gfs2-kmp-default - update to 4.12.14-122.339.1
cluster-md-kmp-default - update to 4.12.14-122.339.1
ocfs2-kmp-default - update to 4.12.14-122.339.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.339.1, 6.4.0-159998.55.1
kernel-source - update to 4.12.14-122.339.1
kernel-macros - update to 4.12.14-122.339.1
gfs2-kmp-default-debuginfo - update to 4.12.14-122.339.1
kernel-devel - update to 4.12.14-122.339.1
kernel-default-man - update to 4.12.14-122.339.1
kernel-default-base - update to 4.12.14-122.339.1
kernel-default-base-debuginfo - update to 4.12.14-122.339.1
kernel-default-devel - addressed in versions 4.12.14-122.339.1, 6.4.0-159998.55.1
dlm-kmp-default-debuginfo - update to 4.12.14-122.339.1
kernel-syms - addressed in versions 4.12.14-122.339.1, 6.4.0-159998.55.1
ocfs2-kmp-default-debuginfo - update to 4.12.14-122.339.1
cluster-md-kmp-default-debuginfo - update to 4.12.14-122.339.1
kernel-default-kgraft-devel - update to 4.12.14-122.339.1
kernel-default-kgraft - update to 4.12.14-122.339.1
kernel-default-debugsource - addressed in versions 4.12.14-122.339.1, 6.4.0-159998.55.1
kernel-default - addressed in versions 4.12.14-122.339.1, 6.4.0-159998.55.1
kernel-default-debuginfo - update to 4.12.14-122.339.1
kernel-obs-build-debugsource - update to 6.4.0-159998.55.1
kernel-64kb - update to 6.4.0-159998.55.1
kernel-obs-build - 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
linux (Debian package) - update to 6.12.111-1

• https://git.kernel.org/stable/c/0918ee2c0eeb4d7f45b82b3dc11e65c2d9b7ad59
• https://git.kernel.org/stable/c/2be39946abcde5a6416fb074ef728429e246a996
• https://git.kernel.org/stable/c/32d6df14fdab71fe1ba304fd9a0db0411ea2e043
• https://git.kernel.org/stable/c/47049fdadc0eaa115e813735b827e1379c0d2cf8
• https://git.kernel.org/stable/c/522d6dcdc645d8f97d6b4cdfd6d8eea307f3ff0e
• https://git.kernel.org/stable/c/8f01f886cc5e7bbc16cbf1a9928fdebbc911e973
• https://git.kernel.org/stable/c/97ca58b0fb026799b99e3d552d5f69cf9a3113ad
• https://git.kernel.org/stable/c/9a756f277eb89f769dbf380f38245c270d31fdb5

• Out-of-bounds write in Linux kernel scsi qla2xxx driver
• Debian update for linux
• Ubuntu update for linux-azure-fde
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more
• Ubuntu update for linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx
• Ubuntu update for linux, linux-aws, linux-aws-5.15 and more
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel