OP-TEE double free in shdr_verify_signature

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Summary

CVECVE-2023-41325
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-09-15 20:15:10 UTC
Updated2026-06-05 20:13:25 UTC
DescriptionOP-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 3.20 and prior to version 3.22, `shdr_verify_signature` can make a double free. `shdr_verify_signature` used to verify a TA binary before it is loaded. To verify a signature of it, allocate a memory for RSA key. RSA key allocate function (`sw_crypto_acipher_alloc_rsa_public_key`) will try to allocate a memory (which is optee’s heap memory). RSA key is consist of exponent and modulus (represent as variable `e`, `n`) and it allocation is not atomic way, so it may succeed in `e` but fail in `n`. In this case sw_crypto_acipher_alloc_rsa_public_key` will free on `e` and return as it is failed but variable ‘e’ is remained as already freed memory address . `shdr_verify_signature` will free again that memory (which is `e`) even it is freed when it failed allocate RSA key. A patch is available in version 3.22. No known workarounds are available.

Risk And Classification

Primary CVSS: v3.1 6.7 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000800000 probability, percentile 0.235820000 (date 2026-06-11)

Problem Types: CWE-415 | CWE-415 CWE-415: Double Free

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary6.7MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N
3.1CNADECLARED7.4HIGHCVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Trustedfirmware Op-tee All All All All
Operating System Trustedfirmware Op-tee 3.22.0 rc1 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OP-TEE Optee Os affected >= 3.20, < 3.22 Not specified

References

ReferenceSourceLinkTags
Double free in shdr_verify_signature · Advisory · OP-TEE/optee_os · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Exploit, Vendor Advisory
core: crypto_bignum_free(): add indirection and set pointer to NULL · OP-TEE/optee_os@e2ec831 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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