Vulnerability · Published Jul 6, 2026 · Assigned by GitHub_M

CVE-2026-41516OP-TEE: Hisilicon HPRE PKCS#1 v1.5 Decryption Padding Oracle

Low 2.5

In plain English

A low-severity security flaw in optee_os from OP-TEE. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).

Severity (CVSS 3.1)2.5Low

Exploit odds (30 days)0.1%top 96.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on Arm; Cortex-A cores using the TrustZone technology. Starting in version 4.5.0 and prior to version 4.11.0, the RSA PKCS#1 v1.5 decryption implementation in the Hisilicon HPRE crypto driver uses non-constant-time `memcmp()` for label hash verification and has multiple distinguishable error paths. This creates a Bleichenbacher-style padding oracle that allows an attacker to recover RSA PKCS#1 v1.5 plaintext. Version 4.11.0 contains a patch. As a workaround, disable Hisilicon HPRE RSA driver with `CFG_HISILICON_ACC_V3=n`.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	optee-os	no fix listed	DEBIAN-CVE-2026-41516
Ubuntu:25.10	optee-os	no fix listed	UBUNTU-CVE-2026-41516
Ubuntu:26.04:LTS	optee-os	no fix listed	UBUNTU-CVE-2026-41516
Ubuntu:26.10	optee-os	no fix listed	UBUNTU-CVE-2026-41516

Affected products (as reported)

Vendor	Product	Versions
OP-TEE	optee_os	>= 4.5.0, < 4.11.0

Weakness: CWE-208 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

References

https://github.com/OP-TEE/optee_os/security/advisories/GHSA-wxp6-8wwr-h4gf x_refsource_CONFIRM