CVE-2025-40085
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix NULL pointer deference in try_to_register_card In try_to_register_card(), the return value of usb_ifnum_to_if() is passed directly to usb_interface_claimed() without a NULL check, which will lead to a NULL pointer dereference when creating an invalid USB audio device. Fix this by adding a check to ensure the interface pointer is valid before passing it to usb_interface_claimed().
Affected versions
Linux kernel versions
5.15.75,
5.19.17,
6.0.3,
6.1
and later are affected. Fixed in
5.15.196,
6.1.158,
6.6.114,
6.12.55,
6.17.5,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40085 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/28412b489b088fb88dff488305fd4e56bd47f6e4
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PatchKernel patch commithttps://git.kernel.org/stable/c/576312eb436326b44b7010f4d9ae2b698df075ea
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PatchKernel patch commithttps://git.kernel.org/stable/c/736159f7b296d7a95f7208eb4799639b1f8b16a0
Frequently asked questions
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What is CVE-2025-40085?
CVE-2025-40085 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.15.75 onward and has been patched in 5.15.196, 6.1.158, 6.6.114 and others. CVE-2025-40085 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-2025-40085?
Yes — CVE-2025-40085 has been patched. Fixed versions include 5.15.196, 6.1.158, 6.6.114 and others. If you are running Linux kernel 5.15.75 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40085 actively exploited?
No — CVE-2025-40085 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.