NULL pointer dereference in tpm2-tss - CVE-2026-73988
Published: November 4, 2026
Vulnerability identifier: #VU159297
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-73988
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service by crashing an application that loads or provisions with attacker-controlled FAPI policy JSON.
The vulnerability exists due to a null pointer dereference in the copy_policy_element function in src/tss2-fapi/ifapi_helpers.c when copying a policy that uses currentPCRs or currentPCRandBanks without a pcrs entry. A local user can supply a crafted policy JSON that selects either option and omits pcrs to trigger an unchecked dereference of from_policy->element.PolicyPCR.pcrs and crash the application.
Affected software
tpm2-tss
How to mitigate CVE-2026-73988
Install security update from vendor's website.
tpm2-tss - addressed in versions 4.1.4, 4.2.0