CVE-2026-80651

A flaw was found in the Linux kernel's crypto: ccp/sev-dev-tsm module. The dsm_create() function fails to properly validate the pdev->bus pointer, leading to a null pointer dereference. A local attacker could exploit this vulnerability to trigger a kernel crash, resulting in a Denial of Service (DoS).

A flaw of moderate severity was found in the Linux kernel's crypto: ccp/sev-dev-tsm module (drivers/crypto/ccp/sev-dev-tsm.c). The dsm_create() function conditionally handles a NULL pdev->bus pointer when computing the PCI segment ID, but the following statements dereference pdev->bus unconditionally through pcie_find_root_port() and pci_dev_id(). A local attacker able to reach the SEV TIO setup path with a PCI device whose pdev->bus is NULL could trigger this null pointer dereference, causing a kernel crash and resulting in a denial of service. The Red Hat CVSS v3.1 severity is moderate, with a score of 5.5 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). The affected SEV TSM code was introduced in the upstream Linux kernel in version 6.19 and is not present in any shipped Red Hat Enterprise Linux or Red Hat In-Vehicle OS kernel. All Red Hat kernel and kernel-rt offerings have therefore been assessed as not affected, because the vulnerable code is not present in the shipped kernels.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.