Unknown

CVE-2026-68368 — usb: gadget: f_ncm: validate datagram bounds in ncm_unwrap_ntb()

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ncm: validate datagram bounds in ncm_unwrap_ntb() When unpacking host-supplied NTBs, ncm_unwrap_ntb() checks datagram length against frame_max but does not verify that the datagram fits within the declared block length. Additionally, when decoding multiple NTBs from a single socket buffer, subsequent block lengths are not checked against the actual remaining buffer data. With these checks missing, a malicious USB host can specify datagram offsets and lengths that point beyond the block, or supply secondary NTB headers declaring lengths larger than the buffer. skb_put_data() then copies adjacent kernel memory from skb_shared_info into the network skb. Fix this by verifying that sufficient buffer space remains for the NTB header before parsing, handling zero-length block declarations, ensuring that block lengths never exceed the remaining buffer space, and verifying that each datagram payload stays strictly within the block boundary.

Published Aug 10, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.22%

ahead of 12% of scored CVEs · Oct 30, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	version ae6a5394d9fbe118bc95cfe376d6a9d91d7547e8version 5.9≥ 5.4.259 and < 5.5≥ 4.19.297 and < 4.20≥ 4.14.328 and < 4.15≥ 5.8.6 and < 5.9≥ 5.4.62 and < 5.5≥ 4.19.143 and < 4.20 and 17 more ≥ 4.14.196 and < 4.15≥ 4.9.235 and < 4.10version e7ca00f35d8a17af1ae19d529193ebc21bfda164version ff3ba016263ee93a1c6209bf5ab1599de7ab1512version 5bdf93a2f5459f944b416b188178ca4a92fd206f≥ 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 and < 35d15bbaec0557330e774ec31412ef508de6e0e0version 4f529c4d1e436230d3af7c09a3239677a14d2b46version 471b23586387a32857778c511be60ab31c98dcfdversion b88ad6e714284b33a47834f5f2a294c2b37c66aaversion f7e0611e207d8908c4f2858e244370529a76dbf7≥ 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 and < 1febec7e47cdcd01f43fb0211094e3010474666e≥ 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 and < 41fd5f2fb0027d3773ae949e3247c2e0a2a7fe5c≥ 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 and < 40c706a0224bde194667e3378c689b542fec4b44≥ 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 and < fff1059d139ef798bab917990524faaf25854ca8≥ 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 and < e07751d0527ccc2a1c32eb0b0b7da3b4b9b5381f≥ 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 and < f87ed889f0f7417b8938c98d8833f559b755373c≥ 2b74b0a04d3e9f9f08ff026e5663dce88ff94e52 and < 6b2be489eaa6293e60549005d91f15ceb150510f	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 30, 2026 · 15 reading(s) · max 0.22%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Aug 10, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

8 on the record

git.kernel.org/stable/c/40c706a0224bde194667e3378c689b542fec4b44
NIST National Vulnerability Database
git.kernel.org/stable/c/f87ed889f0f7417b8938c98d8833f559b755373c
NIST National Vulnerability Database
git.kernel.org/stable/c/1febec7e47cdcd01f43fb0211094e3010474666e
NIST National Vulnerability Database
git.kernel.org/stable/c/41fd5f2fb0027d3773ae949e3247c2e0a2a7fe5c
NIST National Vulnerability Database
git.kernel.org/stable/c/6b2be489eaa6293e60549005d91f15ceb150510f
NIST National Vulnerability Database
git.kernel.org/stable/c/35d15bbaec0557330e774ec31412ef508de6e0e0
NIST National Vulnerability Database
git.kernel.org/stable/c/e07751d0527ccc2a1c32eb0b0b7da3b4b9b5381f
NIST National Vulnerability Database
git.kernel.org/stable/c/fff1059d139ef798bab917990524faaf25854ca8
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99216 Drivers: hv: Don't reset VMBus connection state on error/exit paths 2d
Unknown CVE-2026-99215 power: supply: core: prevent unregistering a power supply while a callback runs 2d
Unknown CVE-2026-99207 scsi: target: Disable interrupts while holding delayed_cmd_lock 2d
Unknown CVE-2026-99208 drm/xe/oa: Zero OA buffer at allocation 2d
Unknown CVE-2026-99209 drm/xe: skip eviction of a BO with no resource 2d
Unknown CVE-2026-99210 accel/rocket: clear rdev on device init failure 2d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-68368 is "usb: gadget: f_ncm: validate datagram bounds in ncm_unwrap_ntb()", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.22% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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