UBUNTU-CVE-2026-42546

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Source

https://ubuntu.com/security/CVE-2026-42546

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42546.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-42546

Upstream

CVE-2026-42546

Published

2026-07-06T20:16:00Z

Modified

2026-07-09T17:15:34.972881187Z

Severity

3.8 (Low) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

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 3.3.0 and prior to version 4.11.0, a resource leak exists in OP-TEE’s shared memory cleanup logic because the function cleanup_shm_refs() in core/tee/entry_std.c fails to apply a required bitmask (OPTEE_MSG_ATTR_TYPE_MASK) to parameter attributes. When processing non-contiguous memory parameters from a normal-world caller, the system fails to match the attribute type in its internal switch statement and skips the necessary mobj_put() call. This results in a persistent reference leak of mobj_reg_shm objects, which remain on internal lists with dangling refcounts. This affects non-FF-A configurations that support non-contiguous, non-secure shared memory. Over time, these accumulated leaks progressively consume the secure-world heap, degrading the system's ability to service trusted application operations and eventually requiring a reboot to recover. Version 4.11.0 contains a patch. No known workarounds are available.

References

Affected packages

Ubuntu:25.10 / optee-os

Package

Name: optee-os
Purl: pkg:deb/ubuntu/optee-os?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.5.0-1

4.5.0-2

4.7.0-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "4.7.0-1",
            "binary_name": "optee-os"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42546.json"

Ubuntu:26.04:LTS / optee-os