VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98764: Linux kernel · usb: gadget: f_fs: Fix NULL pointer dereference in FUNCTIONFS_ENDPOINT_DESC

Source GCVE Database

Authoritative record:CVE-2026-98764

Not known to be exploited · fixed in 7811d8e26c77f8eea79e22d0d14c67ec0658b348 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 7811d8e26c77f8eea79e22d0d14c67ec0658b348, 35ab269602e1f7c4c0fe6ea3477264bea77eced3, 9d8761b3c133f6c6a6d3486839dac60e2cf4bfe3 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 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.

ghsa-2g29-xq2m-qcrf

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ c559a353410939c0884e83bdb0e2420a986ac53b, < 7811d8e26c77f8eea79e22d0d14c67ec0658b348	Fixed in 7811d8e26c77f8eea79e22d0d14c67ec0658b348
LinuxLinux	Affected ≥ c559a353410939c0884e83bdb0e2420a986ac53b, < 35ab269602e1f7c4c0fe6ea3477264bea77eced3	Fixed in 35ab269602e1f7c4c0fe6ea3477264bea77eced3
LinuxLinux	Affected ≥ c559a353410939c0884e83bdb0e2420a986ac53b, < 9d8761b3c133f6c6a6d3486839dac60e2cf4bfe3	Fixed in 9d8761b3c133f6c6a6d3486839dac60e2cf4bfe3
LinuxLinux	Affected ≥ c559a353410939c0884e83bdb0e2420a986ac53b, < 9cd072788c76595529eb38f42bf94d23852f8534	Fixed in 9cd072788c76595529eb38f42bf94d23852f8534
LinuxLinux	Affected ≥ c559a353410939c0884e83bdb0e2420a986ac53b, < 06ac8609d6d185ac18c1d6a6a8a9b99e398bd124	Fixed in 06ac8609d6d185ac18c1d6a6a8a9b99e398bd124
LinuxLinux	Affected =3.18	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to address this issue by adding fallback logic for descriptor selection and safe error handling. Users should update to the fixed kernel version once available. No additional mitigation is indicated in the advisory.

Description

A NULL pointer dereference vulnerability in the Linux kernel's usb gadget FunctionFS endpoint descriptor handling was resolved. The issue occurs when user space sets up FunctionFS with only full-speed descriptors but the gadget operates at a higher speed. The kernel attempts to access a descriptor index that is NULL, causing a kernel panic. The fix implements fallback logic to use lower speed descriptors if the current speed descriptor is missing, preventing the NULL dereference.

References

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