Out-of-bounds read in Linux kernel - CVE-2026-98890

Vulnerability identifier: #VU157624

CSH Severity: Low

CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98890

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to trigger an out-of-bounds kernel memory read, potentially causing a denial of service.

The vulnerability exists due to an out-of-bounds read in the Linux kernel libertas driver's lbs_hard_start_xmit() function when processing short transmit frames in monitor mode. A local privileged user can submit a frame containing insufficient data for the radiotap TX header and the 802.11 destination address field to trigger a read beyond the socket buffer data, potentially causing a kernel crash.

Linux kernel
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-nvidia-tegra (Ubuntu package)
linux-azure-fde-5.15 (Ubuntu package)
linux-gkeop (Ubuntu package)
linux-ibm-5.15 (Ubuntu package)
linux-realtime (Ubuntu package)
linux-intel-iotg (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-tegra-igx (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-intel-iot-realtime (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-azure-fips (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 5.15.0-202.212
linux-kvm (Ubuntu package) - update to 5.15.0-1111.116
linux-aws (Ubuntu package) - update to 5.15.0-1119.126
linux-gcp (Ubuntu package) - update to 5.15.0-1120.130
linux-azure (Ubuntu package) - update to 5.15.0-1125.134
linux-oracle (Ubuntu package) - update to 5.15.0-1116.122
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-nvidia-tegra (Ubuntu package) - update to 5.15.0-1070.72
linux-azure-fde-5.15 (Ubuntu package) - update to 5.15.0-1124.133~20.04.1
linux-gkeop (Ubuntu package) - update to 5.15.0-1102.110
linux-ibm-5.15 (Ubuntu package) - update to 5.15.0-1113.117~20.04.1
linux-realtime (Ubuntu package) - update to 5.15.0-1118.127
linux-intel-iotg (Ubuntu package) - update to 5.15.0-1114.120
linux-nvidia (Ubuntu package) - update to 5.15.0-1114.115
linux-nvidia-tegra-igx (Ubuntu package) - update to 5.15.0-1059.59
linux-ibm (Ubuntu package) - update to 5.15.0-1113.117
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-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

• https://git.kernel.org/stable/c/13ff543e0b2c713aedeaadadde686686e949dc78
• https://git.kernel.org/stable/c/443fac3de65c76544b450b9f9903be8989150d55
• https://git.kernel.org/stable/c/6576baa3fdbaa91fa75e4ba27095f4b8a27349a8
• https://git.kernel.org/stable/c/68c92c991ddb75dfd3fd62a94a1d4d2dde44dc3c
• https://git.kernel.org/stable/c/b657cc98d7936c5d9ed7e0e1944ad0e1f36375bb
• https://git.kernel.org/stable/c/cdcfd662c67833d89ee3d912efde2eb67c8a7326
• https://git.kernel.org/stable/c/d865dd6de8295f2bfaa83f0f5d49d2bef1543065

• Out-of-bounds read in Linux kernel marvell libertas driver
• 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