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CVE.org (no NVD analysis yet)· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 06ac8609d6d185ac18c1d6a6a8a9b99e398bd124, 35ab269602e1f7c4c0fe6ea3477264bea77eced3, 7811d8e26c77f8eea79e22d0d14c67ec0658b348; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 06ac8609d6d185ac18c1d6a6a8a9b99e398bd124, 35ab269602e1f7c4c0fe6ea3477264bea77eced3, 7811d8e26c77f8eea79e22d0d14c67ec0658b348; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Fix NULL pointer dereference in FUNCTIONFS_ENDPOINT_DESC When user space sets up FunctionFS with only full-speed descriptors (e.g., flags = FUNCTIONFS_HAS_FS_DESC) and the gadget operates at a higher speed (such as USB_SPEED_HIGH or USB_SPEED_SUPER), config_ep_by_speed() detects that the function lacks descriptors for the current speed, logs a warning, and falls back to full-speed descriptors. The endpoint is then successfully enabled via usb_ep_enable(), and epfile->ep becomes valid. However, when user space subsequently issues the FUNCTIONFS_ENDPOINT_DESC ioctl to query the endpoint descriptor, ffs_epfile_ioctl() selects the descriptor index solely based on gadget->speed: switch (epfile->ffs->gadget->speed) { case USB_SPEED_SUPER: case USB_SPEED_SUPER_PLUS: desc_idx = 2; break; case USB_SPEED_HIGH: desc_idx = 1; break; default: desc_idx = 0; } desc = epfile->ep->descs[desc_idx]; memcpy(&desc1, desc, desc->bLength); Because user space only supplied full-speed descriptors, epfile->ep->descs[1] is NULL. Dereferencing desc->bLength triggers an immediate kernel NULL pointer dereference panic. Fix this by falling back through lower speed descriptors if the current speed descriptor was not supplied, matching the fallback logic in config_ep_by_speed() and historical f_fs behavior. If still missing, fall back to epfile->ep->ep->desc (the active descriptor), and return -EINVAL safely if no valid descriptor is found. In addition, mark desc as const to match struct usb_ep::desc and avoid discarding qualifiers.

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.18affected
    • c559a353410939c0884e83bdb0e2420a986ac53b and later · before c5f452e057df6ef89300523d13ad6833bfd199cdaffected · git
    • c559a353410939c0884e83bdb0e2420a986ac53b and later · before e5b9d6bb2a8906a1188c9a90cc8d102de3f07cadaffected · git
    • c559a353410939c0884e83bdb0e2420a986ac53b and later · before 7ef0ad5f462fa95bc4c6647d097d7c0384245b9caffected · git
    • c559a353410939c0884e83bdb0e2420a986ac53b and later · before 06ac8609d6d185ac18c1d6a6a8a9b99e398bd124affected · git
    • c559a353410939c0884e83bdb0e2420a986ac53b and later · before 9d8761b3c133f6c6a6d3486839dac60e2cf4bfe3affected · git
    • c559a353410939c0884e83bdb0e2420a986ac53b and later · before 7811d8e26c77f8eea79e22d0d14c67ec0658b348affected · git
    • c559a353410939c0884e83bdb0e2420a986ac53b and later · before 35ab269602e1f7c4c0fe6ea3477264bea77eced3affected · git
    • c559a353410939c0884e83bdb0e2420a986ac53b and later · before 9cd072788c76595529eb38f42bf94d23852f8534affected · git
    • before 3.18not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.10-17.2.10-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98762Oct 18, 2026 · USB: dwc2: shut down wakeup timer before freeing HCD state
    0Monitor
  • ← EarlierCVE-2026-98763Oct 18, 2026 · usb: core: clear both ep_in and ep_out for non-ep0 control endpoints
    0Monitor
  • Later →CVE-2026-98765Oct 18, 2026 · USB: gadget: dummy-hcd: Fix wait for outstanding request completions
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux06ac8609d6d185ac18c1d6a6a8a9b99e398bd124Vendor (CNA)
Linux Linux35ab269602e1f7c4c0fe6ea3477264bea77eced3Vendor (CNA)
Linux Linux7811d8e26c77f8eea79e22d0d14c67ec0658b348Vendor (CNA)
Linux Linux7ef0ad5f462fa95bc4c6647d097d7c0384245b9cVendor (CNA)
Linux Linux9cd072788c76595529eb38f42bf94d23852f8534Vendor (CNA)
Linux Linux9d8761b3c133f6c6a6d3486839dac60e2cf4bfe3Vendor (CNA)
Linux Linuxc5f452e057df6ef89300523d13ad6833bfd199cdVendor (CNA)
Linux Linuxe5b9d6bb2a8906a1188c9a90cc8d102de3f07cadVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 6, 2026+19 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Exploit maturity— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records