CVE-2026-52982 (GCVE-0-2026-52982)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:28 – Updated: 2026-06-28 06:37
VLAI
Title
net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5af290c86fa81ddbc86a08d54229af5daa40c6a4 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 24831b0b2ada9fef18d1f486b7b7c444ee5ba637 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 423b5b86e14e190f6e3161eb5f2ea5f908295ba7 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5db090ca07b28a63fb1499690cf19a3f3adafacb (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 30cf9829d09ca958279c937af8e35495cd2f1e09 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6999d70e0eda39af029fa1891c48f0a8832b09d5 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4dd7eb94f79486b77ca6b4c8676aedbc465dc802 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 23f0e34c64acba15cad4d23e50f41f533da195fa (git)
Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "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-\u003elen 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-\u003etx_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-\u003elen 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-\u003etx_skb = skb;\n  usb_submit_urb()      --+\n                          |-------\u003e write_bulk_callback()\n                          |           dev_kfree_skb_irq(dev-\u003etx_skb)\n                          |         net_tx_action()\n                          |           napi_skb_cache_put()   \u003c-- free\n  netdev-\u003estats.tx_bytes  |\n    += skb-\u003elen;          \u003c-- UAF read\n\nFix it by caching skb-\u003elen 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-\u003elen), 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."
        }
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      "metrics": [
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
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      "providerMetadata": {
        "dateUpdated": "2026-06-28T06:37:35.269Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/5af290c86fa81ddbc86a08d54229af5daa40c6a4"
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          "url": "https://git.kernel.org/stable/c/24831b0b2ada9fef18d1f486b7b7c444ee5ba637"
        },
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          "url": "https://git.kernel.org/stable/c/423b5b86e14e190f6e3161eb5f2ea5f908295ba7"
        },
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          "url": "https://git.kernel.org/stable/c/5db090ca07b28a63fb1499690cf19a3f3adafacb"
        },
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          "url": "https://git.kernel.org/stable/c/30cf9829d09ca958279c937af8e35495cd2f1e09"
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        },
        {
          "url": "https://git.kernel.org/stable/c/23f0e34c64acba15cad4d23e50f41f533da195fa"
        }
      ],
      "title": "net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()",
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    "cveId": "CVE-2026-52982",
    "datePublished": "2026-06-24T16:28:57.763Z",
    "dateReserved": "2026-06-09T07:44:35.376Z",
    "dateUpdated": "2026-06-28T06:37:35.269Z",
    "state": "PUBLISHED"
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      "date": "2026-07-02",
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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-\u003elen 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-\u003etx_skb = skb;\\n  usb_submit_urb()      --+\\n                          |-------\u003e write_bulk_callback()\\n                          |           dev_kfree_skb_irq(dev-\u003etx_skb)\\n                          |         net_tx_action()\\n                          |           napi_skb_cache_put()   \u003c-- free\\n  netdev-\u003estats.tx_bytes  |\\n    += skb-\u003elen;          \u003c-- UAF read\\n\\nFix it by caching skb-\u003elen 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-\u003elen), 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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/usb/rtl8150.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"5af290c86fa81ddbc86a08d54229af5daa40c6a4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"24831b0b2ada9fef18d1f486b7b7c444ee5ba637\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"423b5b86e14e190f6e3161eb5f2ea5f908295ba7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"5db090ca07b28a63fb1499690cf19a3f3adafacb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"30cf9829d09ca958279c937af8e35495cd2f1e09\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"6999d70e0eda39af029fa1891c48f0a8832b09d5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"4dd7eb94f79486b77ca6b4c8676aedbc465dc802\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"23f0e34c64acba15cad4d23e50f41f533da195fa\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/usb/rtl8150.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.141\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.91\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/23f0e34c64acba15cad4d23e50f41f533da195fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/24831b0b2ada9fef18d1f486b7b7c444ee5ba637\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/30cf9829d09ca958279c937af8e35495cd2f1e09\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/423b5b86e14e190f6e3161eb5f2ea5f908295ba7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4dd7eb94f79486b77ca6b4c8676aedbc465dc802\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5af290c86fa81ddbc86a08d54229af5daa40c6a4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5db090ca07b28a63fb1499690cf19a3f3adafacb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6999d70e0eda39af029fa1891c48f0a8832b09d5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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