CVE-2025-40071
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.
Affected versions
Linux kernel versions
5.15.54,
5.17.6,
5.18
and later are affected. Fixed in
6.6.112,
6.12.53,
6.17.3,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40071 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/3cf0b3c243e56bc43be560617416c1d9f301f44c
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PatchKernel patch commithttps://git.kernel.org/stable/c/5416e89b81b00443cb03c88df8da097ae091a141
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PatchKernel patch commithttps://git.kernel.org/stable/c/c36785f9de03df56ff9b8eca30fa681a12b2310d
Frequently asked questions
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What is CVE-2025-40071?
CVE-2025-40071 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.15.54 onward and has been patched in 6.6.112, 6.12.53, 6.17.3 and others. CVE-2025-40071 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-40071?
Yes — CVE-2025-40071 has been patched. Fixed versions include 6.6.112, 6.12.53, 6.17.3 and others. If you are running Linux kernel 5.15.54 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40071 actively exploited?
No — CVE-2025-40071 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.