{"id":"CVE-2026-52982","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()\n\nsyzbot reported a KASAN slab-use-after-free read in rtl8150_start_xmit()\nwhen accessing skb->len for tx s…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()\n\nsyzbot reported a KASAN slab-use-after-free read in rtl8150_start_xmit()\nwhen accessing skb->len for tx s…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","published":"2026-06-24","updated":"2026-07-10","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-52982","references":[{"url":"https://git.kernel.org/stable/c/23f0e34c64acba15cad4d23e50f41f533da195fa","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/24831b0b2ada9fef18d1f486b7b7c444ee5ba637","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/30cf9829d09ca958279c937af8e35495cd2f1e09","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/423b5b86e14e190f6e3161eb5f2ea5f908295ba7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4dd7eb94f79486b77ca6b4c8676aedbc465dc802","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5af290c86fa81ddbc86a08d54229af5daa40c6a4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5db090ca07b28a63fb1499690cf19a3f3adafacb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6999d70e0eda39af029fa1891c48f0a8832b09d5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00734,"epssPercentile":0.52362,"ingestedAt":"2026-07-11T13:13:25.459Z","slug":"CVE-2026-52982","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()\n\nsyzbot reported a KASAN slab-use-after-free read in rtl8150_start_xmit()\nwhen accessing skb->len for tx statistics after usb_submit_urb() has\nbeen called:\n\n  BUG: KASAN: slab-use-after-free in rtl8150_start_xmit+0x71f/0x760\n    drivers/net/usb/rtl8150.c:712\n  Read of size 4 at addr ffff88810eb7a930 by task kworker/0:4/5226\n\nThe URB completion handler write_bulk_callback() frees the skb via\ndev_kfree_skb_irq(dev->tx_skb). The URB may complete on another CPU\nin softirq context before usb_submit_urb() returns in the submitter,\nso by the time the submitter reads skb->len the skb has already been\nqueued to the per-CPU completion_queue and freed by net_tx_action():\n\n  CPU A (xmit)                      CPU B (USB completion softirq)\n  ------------                      ------------------------------\n  dev->tx_skb = skb;\n  usb_submit_urb()      --+\n                          |-------> write_bulk_callback()\n                          |           dev_kfree_skb_irq(dev->tx_skb)\n                          |         net_tx_action()\n                          |           napi_skb_cache_put()   <-- free\n  netdev->stats.tx_bytes  |\n    += skb->len;          <-- UAF read\n\nFix it by caching skb->len before submitting the URB and using the\ncached value when updating the tx_bytes counter.\n\nThe pre-existing tx_bytes semantics are preserved: the counter tracks\nthe original frame length (skb->len), not the ETH_ZLEN/USB-alignment\npadded \"count\" value that is handed to the device.  Changing that\nwould be a user-visible accounting change and is out of scope for\nthis UAF fix.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}