CVE-2026-90023
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers() Previously fsg_num_buffers_validate() was removed as it was not necessary due to Kconfig setting the limits for n from 2 to 256 with default as 2. However, setting the page content in such a way that kstrtou8() reflects n value as either 0 or 1 bypasses these restrictions leading to a null pointer dereference if n is 0. Fix this by adding a check for n < 2 and returning -EINVAL if n is either 0 or 1 consistent with Kconfig logic.
Affected versions
Linux kernel versions
4.8
and later are affected. Fixed in
6.12.112,
6.18.52,
7.2.5,
7.3-rc2
and their respective stable series.
References
4 totalFrequently asked questions
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What is CVE-2026-90023?
CVE-2026-90023 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.8 onward and has been patched in 6.12.112, 6.18.52, 7.2.5 and others. CVE-2026-90023 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-2026-90023?
Yes. CVE-2026-90023 has been patched. Fixed versions include 6.12.112, 6.18.52, 7.2.5 and others. If you are running Linux kernel 4.8 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-90023 actively exploited?
No. CVE-2026-90023 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.