VulnerabilityPublished 16 Sep 2026Updated 21 Oct 2026

CVE-2026-90023: Linux kernel · usb: gadget: f_mass_storage: fix null pointer dereference in

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f4f0fe3ab47ed57ee4974fdd3e9dccb7839a7ebf : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f4f0fe3ab47ed57ee4974fdd3e9dccb7839a7ebf, b9b5b5df5b8dd3c1572ed267200276a44cc67d8e, 51cc9af4f2d3f0b765266aced66b9b532b423b13 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 16 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ fe5a6c48fd954489f51aab151d5dad9254c76419, < f4f0fe3ab47ed57ee4974fdd3e9dccb7839a7ebf	Fixed in f4f0fe3ab47ed57ee4974fdd3e9dccb7839a7ebf
LinuxLinux	Affected ≥ fe5a6c48fd954489f51aab151d5dad9254c76419, < b9b5b5df5b8dd3c1572ed267200276a44cc67d8e	Fixed in b9b5b5df5b8dd3c1572ed267200276a44cc67d8e
LinuxLinux	Affected ≥ fe5a6c48fd954489f51aab151d5dad9254c76419, < 51cc9af4f2d3f0b765266aced66b9b532b423b13	Fixed in 51cc9af4f2d3f0b765266aced66b9b532b423b13
LinuxLinux	Affected ≥ fe5a6c48fd954489f51aab151d5dad9254c76419, < 9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957	Fixed in 9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957
LinuxLinux	Affected ≥ fe5a6c48fd954489f51aab151d5dad9254c76419, < 2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc	Fixed in 2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc
LinuxLinux	Affected =4.8	Fixed in–

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.

References

Community reviews

Loading reviews…