Out-of-bounds read in Linux kernel - CVE-2026-98887

Vulnerability identifier: #VU157621

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-2026-98887

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 that may cause a denial of service.

The vulnerability exists due to an out-of-bounds read in the Linux kernel mac80211_hwsim function hwsim_tx_info_frame_received_nl() when processing an undersized HWSIM_ATTR_TX_INFO netlink attribute. A local privileged user can submit a short or zero-length attribute that passes the maximum-length-only validation to trigger an unconditional eight-byte read beyond the attribute payload, potentially causing a kernel fault.

Linux kernel
Ubuntu
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-igx (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-aws (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia-tegra (Ubuntu package) - update to 5.15.0-1070.72
linux-nvidia-tegra-igx (Ubuntu package) - update to 5.15.0-1059.59
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1070.72~20.04.1
linux (Ubuntu package) - update to 7.0.0-42.42
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
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

• https://git.kernel.org/stable/c/13edd8ea7ff2ce6a964b290ef2034cd8cbed96c7
• https://git.kernel.org/stable/c/1ae85bb34fe3510659b86d6a5f8036dd498233f8
• https://git.kernel.org/stable/c/3a96bb65b4b820d8b41fa155781ec1c29e3479d4
• https://git.kernel.org/stable/c/3dc723ac78a6e4fa0fd49e27e487ed319da40a9f
• https://git.kernel.org/stable/c/59e1f2a0242232b4a3af144ae317d3913fc09046
• https://git.kernel.org/stable/c/6f6368b20f8c9481fa7ba7b672dcb3c9f36b2695
• https://git.kernel.org/stable/c/b5b1234bbfa25537fb9a5c0d62c328ed4547f721

• Out-of-bounds read in Linux kernel wireless virtual driver
• 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