Linux Kernel USB core Vulnerability Rated 7.5 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-74678

Key Details

CVE	CVE-2026-74678
CVSS Score / Version	7.5 (High) / CVSS v3.1
Updated	2026-10-14
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is none; integrity impact is none; availability impact is high.
Affected products	Linux Kernel
Exploitation prediction (EPSS)	0.48% probability of exploitation in the next 30 days (40% percentile) -- FIRST.org's EPSS model.

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

In the Linux kernel, the following vulnerability has been resolved:

net: usb: ax88179_178a: fix skb leak in ax88179_tx_fixup()

When the interface has NETIF_F_SG enabled and skb_linearize() fails in

ax88179_tx_fixup(), the function returns NULL without freeing the skb.

usbnet_start_xmit() treats a NULL return from tx_fixup() as a drop

(info->flags does not set FLAG_MULTI_PACKET for this driver), jumping

to the "drop" label where it does `if (skb) dev_kfree_skb_any(skb)`.

Because tx_fixup() returned NULL, the local skb variable in

usbnet_start_xmit() is NULL, so the original skb is never freed — a

memory leak on every TX frame whose linearization fails (i.e. under

memory pressure).

Free the skb before returning, matching the error handling already used

for the pskb_expand_head() failure path in the same function. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-74678
CVE	https://www.cve.org/CVERecord?id=CVE-2026-74678

Source

Reference

NVD

CVE