Description
In the Linux kernel, the following vulnerability has been resolved: net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit() syzbot reported a KASAN slab-use-after-free read in rtl8150_start_xmit() when accessing skb->len for tx statistics after usb_submit_urb() has been called: BUG: KASAN: slab-use-after-free in rtl8150_start_xmit+0x71f/0x760 drivers/net/usb/rtl8150.c:712 Read of size 4 at addr ffff88810eb7a930 by task kworker/0:4/5226 The URB completion handler write_bulk_callback() frees the skb via dev_kfree_skb_irq(dev->tx_skb). The URB may complete on another CPU in softirq context before usb_submit_urb() returns in the submitter, so by the time the submitter reads skb->len the skb has already been queued to the per-CPU completion_queue and freed by net_tx_action(): CPU A (xmit) CPU B (USB completion softirq) ------------ ------------------------------ dev->tx_skb = skb; usb_submit_urb() --+ |-------> write_bulk_callback() | dev_kfree_skb_irq(dev->tx_skb) | net_tx_action() | napi_skb_cache_put() <-- free netdev->stats.tx_bytes | += skb->len; <-- UAF read Fix it by caching skb->len before submitting the URB and using the cached value when updating the tx_bytes counter. The pre-existing tx_bytes semantics are preserved: the counter tracks the original frame length (skb->len), not the ETH_ZLEN/USB-alignment padded "count" value that is handed to the device. Changing that would be a user-visible accounting change and is out of scope for this UAF fix.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to <5af290c86fa81ddbc86a08d54229af5daa40c6a4; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to <24831b0b2ada9fef18d1f486b7b7c444ee5ba637; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to <423b5b86e14e190f6e3161eb5f2ea5f908295ba7; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to <5db090ca07b28a63fb1499690cf19a3f3adafacb; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to <30cf9829d09ca958279c937af8e35495cd2f1e09; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to <6999d70e0eda39af029fa1891c48f0a8832b09d5; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to <4dd7eb94f79486b77ca6b4c8676aedbc465dc802; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to <23f0e34c64acba15cad4d23e50f41f533da195fa |
| Linux | Linux | 2.6.12; 0 to <2.6.12; 5.10.258 to <=5.10.*; 5.15.209 to <=5.15.*; 6.1.175 to <=6.1.*; 6.6.141 to <=6.6.*; 6.12.91 to <=6.12.*; 6.18.33 to <=6.18.*; 7.0.10 to <=7.0.*; 7.1 to <=* |
References
- https://git.kernel.org/stable/c/5af290c86fa81ddbc86a08d54229af5daa40c6a4
- https://git.kernel.org/stable/c/24831b0b2ada9fef18d1f486b7b7c444ee5ba637
- https://git.kernel.org/stable/c/423b5b86e14e190f6e3161eb5f2ea5f908295ba7
- https://git.kernel.org/stable/c/5db090ca07b28a63fb1499690cf19a3f3adafacb
- https://git.kernel.org/stable/c/30cf9829d09ca958279c937af8e35495cd2f1e09
- https://git.kernel.org/stable/c/6999d70e0eda39af029fa1891c48f0a8832b09d5
- https://git.kernel.org/stable/c/4dd7eb94f79486b77ca6b4c8676aedbc465dc802
- https://git.kernel.org/stable/c/23f0e34c64acba15cad4d23e50f41f533da195fa
Generated from the official CVE List on 25 Jun 2026 10:14 UTC.