VULNERABILITY INTELLIGENCE
CVE-2026-75900
CVSS score6.1 MEDIUM
EPSS probability0.11%
CISA KEVNot currently listed
Published2026-08-19
Last modified2026-08-21
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
Description
An out-of-bounds read vulnerability was found in swtpm's SWTPM_NVRAM_CheckHeader() function. The entry guard checks the buffer length against sizeof(bh), where bh is a pointer, instead of sizeof(*bh), the actual struct size. This allows an undersized buffer to pass validation, causing a 2-byte heap overread on 64-bit systems (6 bytes on 32-bit) when accessing the totlen field. This may cause daemon termination on some platforms and leaks heap data to the log.
Weakness classification
- secalert@redhat.com: CWE-125