CVE-2026-74678

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

State: Published
Severity: 7.5 High
Published: Aug 22, 2026
Updated: Oct 16, 2026
Reserved: Aug 15, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	16b1c4e01c89ba07367461e0bc4cb84993c2d027 to before 83a765cbd7b4d11b0b9fa1bb9d941ae911a2159bAffected 16b1c4e01c89ba07367461e0bc4cb84993c2d027 to before 1c63303659a2264bd55d9813df74cb4caeed5922Affected 16b1c4e01c89ba07367461e0bc4cb84993c2d027 to before 2be5091fa693b9119ad25a8bb8c149d236a23adeAffected 16b1c4e01c89ba07367461e0bc4cb84993c2d027 to before 58733b1dd46bb231d9d279c132a20ee46da1b664Affected 16b1c4e01c89ba07367461e0bc4cb84993c2d027 to before 4039cd807a5a46dc5f7618fffae926b8ad8455ebAffected 16b1c4e01c89ba07367461e0bc4cb84993c2d027 to before 1f428e30947395d9b9aacee03e25a4e6cfcad7a4Affected
LinuxLinux	5.17Affected before 5.17Not affected 6.1.183 through 6.1.Not affected 6.6.152 through 6.6.Not affected 6.12.104 through 6.12.Not affected 6.18.45 through 6.18.Not affected 7.1.9 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

16b1c4e01c89ba07367461e0bc4cb84993c2d027 to before 83a765cbd7b4d11b0b9fa1bb9d941ae911a2159bAffected
16b1c4e01c89ba07367461e0bc4cb84993c2d027 to before 1c63303659a2264bd55d9813df74cb4caeed5922Affected
16b1c4e01c89ba07367461e0bc4cb84993c2d027 to before 2be5091fa693b9119ad25a8bb8c149d236a23adeAffected
16b1c4e01c89ba07367461e0bc4cb84993c2d027 to before 58733b1dd46bb231d9d279c132a20ee46da1b664Affected
16b1c4e01c89ba07367461e0bc4cb84993c2d027 to before 4039cd807a5a46dc5f7618fffae926b8ad8455ebAffected
16b1c4e01c89ba07367461e0bc4cb84993c2d027 to before 1f428e30947395d9b9aacee03e25a4e6cfcad7a4Affected

LinuxLinux

5.17Affected
before 5.17Not affected
6.1.183 through 6.1.*Not affected
6.6.152 through 6.6.*Not affected
6.12.104 through 6.12.*Not affected
6.18.45 through 6.18.*Not affected
7.1.9 through 7.1.*Not affected
7.2 and laterNot affected

References

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