CVE-2026-71969

Summary

OP-TEE OS through 4.10.0, fixed in commit 7b8b494, contains a buffer underwrite vulnerability in the RSA NOPAD encrypt and decrypt operations within the mbedTLS software backend and SE050 hardware driver that allows a malicious Trusted Application to corrupt secure-world heap memory by supplying an input length exceeding the RSA modulus size. When src_len exceeds rsa_len, the subtraction expression wraps to a large unsigned value, causing a subsequent memcpy to write attacker-controlled data before the destination buffer in S-EL1 secure-world heap memory.

Affected Software

VendorProductVersion RangeStatus
OP-TEEoptee_os0 <= 4.10.0affected
OP-TEEoptee_os7b8b494e0a324cefec8ed386b7de413b44f1aaf3unaffected

Weaknesses

  • CWE-787: Out-of-bounds Write
  • CWE-124: Buffer Underwrite ('Buffer Underflow')

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References