Out-of-bounds write in tpm2-tss - CVE-2026-73990
Published: November 4, 2026
Vulnerability identifier: #VU159299
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-73990
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service or corrupt memory in applications that process attacker-controlled event logs.
The vulnerability exists due to an off-by-one bounds check in the tpm2-tss FAPI event log parser when processing event log entries. A local user can supply a crafted event log with PCRIndex = 32 to trigger out-of-bounds reads or writes to the JSON serializer's recnum_tab[TPM2_MAX_PCRS] array, potentially corrupting memory or crashing the application.
Affected software
tpm2-tss
How to mitigate CVE-2026-73990
Install security update from vendor's website.
tpm2-tss - addressed in versions 4.1.4, 4.2.0