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CVE-2026-90023

UnknownEPSS 0.22%

Last modified

CVE-2026-90023 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.22% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability
0.22%

12.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= fe5a6c48fd954489f51aab151d5dad9254c76419, < 38edd187a37db0d8e4bf84cc954dbdbe7bfa366f; >= fe5a6c48fd954489f51aab151d5dad9254c76419, < e54820b9dc1d6d731ecc3e51462445dc952906a7; >= fe5a6c48fd954489f51aab151d5dad9254c76419, < 5d56dbaeb81d5cd967cdee8ddcc70814b7139246; >= fe5a6c48fd954489f51aab151d5dad9254c76419, < f4f0fe3ab47ed57ee4974fdd3e9dccb7839a7ebf; >= fe5a6c48fd954489f51aab151d5dad9254c76419, < 51cc9af4f2d3f0b765266aced66b9b532b423b13; >= fe5a6c48fd954489f51aab151d5dad9254c76419, < 9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957; >= fe5a6c48fd954489f51aab151d5dad9254c76419, < b9b5b5df5b8dd3c1572ed267200276a44cc67d8e; >= fe5a6c48fd954489f51aab151d5dad9254c76419, < 2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc
LinuxLinux4.8

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is 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.
How severe is CVE-2026-90023?
Severity scoring for CVE-2026-90023 is pending analysis. The EPSS model estimates a 0.22% probability of exploitation in the next 30 days.
How do I fix CVE-2026-90023?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST