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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2026-52982

net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()

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Status
Published
Published
Updated
Assigning organization
Linux

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 5af290c86fa81ddbc86a08d54229af5daa40c6a4affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 24831b0b2ada9fef18d1f486b7b7c444ee5ba637affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 423b5b86e14e190f6e3161eb5f2ea5f908295ba7affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 5db090ca07b28a63fb1499690cf19a3f3adafacbaffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 30cf9829d09ca958279c937af8e35495cd2f1e09affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 6999d70e0eda39af029fa1891c48f0a8832b09d5affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 4dd7eb94f79486b77ca6b4c8676aedbc465dc802affected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 23f0e34c64acba15cad4d23e50f41f533da195faaffected

Linux Linux

Default version status: affected

  • 2.6.12affected
  • 0 to < 2.6.12unaffected
  • 5.10.258 to ≤ 5.10.*unaffected
  • 5.15.209 to ≤ 5.15.*unaffected
  • 6.1.175 to ≤ 6.1.*unaffected
  • 6.6.141 to ≤ 6.6.*unaffected
  • 6.12.91 to ≤ 6.12.*unaffected
  • 6.18.33 to ≤ 6.18.*unaffected
  • 7.0.10 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References