UNKNOWN NVD
CVE-2026-74678
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_
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.
References
- https://git.kernel.org/stable/c/1c63303659a2264bd55d9813df74cb4caeed5922
- https://git.kernel.org/stable/c/1f428e30947395d9b9aacee03e25a4e6cfcad7a4
- https://git.kernel.org/stable/c/2be5091fa693b9119ad25a8bb8c149d236a23ade
- https://git.kernel.org/stable/c/4039cd807a5a46dc5f7618fffae926b8ad8455eb
- https://git.kernel.org/stable/c/58733b1dd46bb231d9d279c132a20ee46da1b664
This unknown severity vulnerability was published on 2026-08-22 via NVD.
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