Out-of-bounds read in Linux kernel - CVE-2026-74340

Vulnerability identifier: #VU142860

CSH Severity: Medium

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

CVE-ID: CVE-2026-74340

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to out-of-bounds read in the wcn36xx_smd_print_reg_info_ind function when processing a firmware PRINT_REG_INFO indication. A remote attacker can provide a firmware-controlled count value that exceeds the actual message data to disclose sensitive information.

The issue occurs because the count field is used as a loop bound for indexing a flexible regs[] array without validation against the received message length.

Linux kernel
Ubuntu
linux-nvidia (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-azure (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia (Ubuntu package) - addressed in versions 5.15.0-1112.113, 5.15.0.1112.112
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1036.39+1
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux (Ubuntu package) - addressed in versions 7.0.0-38.38, 7.0.0-38.38.1, 7.0.0-1008.9, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14, 7.0.0-1015.15
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1015.15
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1017.17

• https://git.kernel.org/stable/c/0907c06dccae9e3c8d5a68eb9014beec73a36e79
• https://git.kernel.org/stable/c/22b0b8572a64362531dd0ed499b75e16282aeb2b
• https://git.kernel.org/stable/c/23d210877968657bd07e1a517e0b516db20a1d80
• https://git.kernel.org/stable/c/3cf92b44c4fb88a5e8de8733a4494c0956606bca
• https://git.kernel.org/stable/c/64228dfc4247aca178c01e5a37af7d8dcc7a6089
• https://git.kernel.org/stable/c/df2187acfca6c6cca372c5d35f42394d9c270b09
• https://git.kernel.org/stable/c/f03782f7f41f2afee5076a1ef08ced5649218771
• https://git.kernel.org/stable/c/f987efff29a5fe45320ea5991c9d5cb98b676953

• Out-of-bounds read in Linux kernel ath wcn36xx driver
• Ubuntu update for linux-gcp-7.0
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure-7.0
• Ubuntu update for linux-nvidia-tegra
• Ubuntu update for linux
• Ubuntu update for linux-azure
• Ubuntu update for linux-oem-7.0