Off-by-one in Linux kernel - CVE-2026-98392

Vulnerability identifier: #VU155928

CSH Severity: Low

CVSS v4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98392

CWE-ID: CWE-193

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause out-of-bounds memory access.

The vulnerability exists due to an off-by-one error in the bounds check in btintel_pcie_msix_tx_handle() when handling transmit queue entries. A local user can trigger processing of a transmit descriptor whose index equals the transmit queue count to cause out-of-bounds memory access.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (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 (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
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/3dd1b41f96aad08444be1b7626c89de2b9f2abd4
• https://git.kernel.org/stable/c/72bbd7c815ef92399b7b109977ae4669ce22ee6e
• https://git.kernel.org/stable/c/932a87444107e6724d808082676bba5c915c98ad
• https://git.kernel.org/stable/c/a641201a9b4d69ee8a7ef35f7aa597dddee6b9ee

• Off-by-one in Linux kernel bluetooth driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more