CVE-2026-74678

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux16b1c4e01c89ba07367461e0bc4cb84993c2d027 < 83a765cbd7b4d11b0b9fa1bb9d941ae911a2159baffected
LinuxLinux16b1c4e01c89ba07367461e0bc4cb84993c2d027 < 1c63303659a2264bd55d9813df74cb4caeed5922affected
LinuxLinux16b1c4e01c89ba07367461e0bc4cb84993c2d027 < 2be5091fa693b9119ad25a8bb8c149d236a23adeaffected
LinuxLinux16b1c4e01c89ba07367461e0bc4cb84993c2d027 < 58733b1dd46bb231d9d279c132a20ee46da1b664affected
LinuxLinux16b1c4e01c89ba07367461e0bc4cb84993c2d027 < 4039cd807a5a46dc5f7618fffae926b8ad8455ebaffected
LinuxLinux16b1c4e01c89ba07367461e0bc4cb84993c2d027 < 1f428e30947395d9b9aacee03e25a4e6cfcad7a4affected
LinuxLinux5.17affected
LinuxLinux0 < 5.17unaffected
LinuxLinux6.1.183 <= 6.1.*unaffected
LinuxLinux6.6.152 <= 6.6.*unaffected
LinuxLinux6.12.104 <= 6.12.*unaffected
LinuxLinux6.18.45 <= 6.18.*unaffected
LinuxLinux7.1.9 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References