In the Linux kernel, the following vulnerability has been resolved: tty: n_gsm: Don't block input queue by waiting MSC Currently gsm_queue() processes incoming frames and when opening a DLC channel it calls gsm_dlci_open() which calls gsm_modem_update(). If basic mode is used it calls gsm_modem_upd_via_msc() and it cannot block the input queue by waiting the response to come into the same input queue. Instead allow sending Modem Status Command without waiting for remote end to respond. Define a new function gsm_modem_send_initial_msc() for this purpose. As MSC is only valid for basic encoding, it does not do anything for advanced or when convergence layer type 2 is used.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/3cf0b3c243e56bc43be560617416c1d9f301f44c cve-icon cve-icon
https://git.kernel.org/stable/c/5416e89b81b00443cb03c88df8da097ae091a141 cve-icon cve-icon
https://git.kernel.org/stable/c/c36785f9de03df56ff9b8eca30fa681a12b2310d cve-icon cve-icon
https://git.kernel.org/stable/c/c5a2791a7f11939f05f95c01f0aec0c55bbf28d5 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025102818-CVE-2025-40071-6cff@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-40071 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-40071 cve-icon
History

Wed, 29 Oct 2025 11:00:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Wed, 29 Oct 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Important

Tue, 28 Oct 2025 12:00:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: tty: n_gsm: Don't block input queue by waiting MSC Currently gsm_queue() processes incoming frames and when opening a DLC channel it calls gsm_dlci_open() which calls gsm_modem_update(). If basic mode is used it calls gsm_modem_upd_via_msc() and it cannot block the input queue by waiting the response to come into the same input queue. Instead allow sending Modem Status Command without waiting for remote end to respond. Define a new function gsm_modem_send_initial_msc() for this purpose. As MSC is only valid for basic encoding, it does not do anything for advanced or when convergence layer type 2 is used.
Title tty: n_gsm: Don't block input queue by waiting MSC
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-10-28T11:48:39.417Z

Reserved: 2025-04-16T07:20:57.159Z

Link: CVE-2025-40071

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-10-28T12:15:41.613

Modified: 2025-10-30T15:05:32.197

Link: CVE-2025-40071

cve-icon Redhat

Severity : Important

Publid Date: 2025-10-28T00:00:00Z

Links: CVE-2025-40071 - Bugzilla