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

Vulnerability from cvelistv5 – Published: 2026-06-24 16:28 – Updated: 2026-08-05 12:32
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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{
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              "status": "unaffected",
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              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
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              "lessThanOrEqual": "6.12.*",
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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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - A remote peer can cause the host to transmit packets through an affected rtl8150 interface via normal network responses such as ICMP replies or TCP resets/ACKs, reaching rtl8150_start_xmit(). Choosing the higher-severity defensible path, this is network-reachable.\nAC:L - The transmit path is repeatable and has no unusual prerequisite beyond traffic through the affected interface; the UAF is a normal asynchronous URB completion lifetime bug. Under the required guidance, UAF/race uncertainty is scored low complexity unless clearly beyond attacker influence.\nPR:N - Network-triggered host replies require no local account or authentication. Even the local sendto() path has no driver privilege check, but the network path supports PR:N.\nUI:N - No victim action is needed once the affected interface is present and configured. Packets or induced replies can repeatedly drive the transmit path.\nS:U - The corruption occurs within the kernel networking/USB driver security authority. There is no VM escape, IOMMU bypass, or cross-scope boundary identified.\nC:H - This is a slab use-after-free on an skb after the completion path can free it. Per the required kernel guidance, UAFs are scored as high confidentiality impact because freed object reuse can enable information disclosure.\nI:H - Use-after-free memory lifetime bugs can be shaped through heap reuse and may provide write/control-flow primitives. Per the required guidance, UAFs are high integrity impact.\nA:H - The reported bug is a KASAN slab-use-after-free in kernel transmit code and can crash or destabilize the kernel when triggered repeatedly. Per the required guidance, UAFs have high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:32:20.308Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5af290c86fa81ddbc86a08d54229af5daa40c6a4"
        },
        {
          "url": "https://git.kernel.org/stable/c/24831b0b2ada9fef18d1f486b7b7c444ee5ba637"
        },
        {
          "url": "https://git.kernel.org/stable/c/423b5b86e14e190f6e3161eb5f2ea5f908295ba7"
        },
        {
          "url": "https://git.kernel.org/stable/c/5db090ca07b28a63fb1499690cf19a3f3adafacb"
        },
        {
          "url": "https://git.kernel.org/stable/c/30cf9829d09ca958279c937af8e35495cd2f1e09"
        },
        {
          "url": "https://git.kernel.org/stable/c/6999d70e0eda39af029fa1891c48f0a8832b09d5"
        },
        {
          "url": "https://git.kernel.org/stable/c/4dd7eb94f79486b77ca6b4c8676aedbc465dc802"
        },
        {
          "url": "https://git.kernel.org/stable/c/23f0e34c64acba15cad4d23e50f41f533da195fa"
        }
      ],
      "title": "net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52982",
    "datePublished": "2026-06-24T16:28:57.763Z",
    "dateReserved": "2026-06-09T07:44:35.376Z",
    "dateUpdated": "2026-08-05T12:32:20.308Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-52982",
      "date": "2026-08-05",
      "epss": "0.00536",
      "percentile": "0.42188"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-09T14:44:27.000Z",
      "cve": "CVE-2026-52982",
      "id": "msrc_CVE-2026-52982",
      "initial_release_date": "2026-06-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-52982.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-52982\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-24T17:17:08.887\",\"lastModified\":\"2026-07-14T16:49:22.360\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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.\"}],\"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}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.12.1\",\"versionEndExcluding\":\"5.10.258\",\"matchCriteriaId\":\"E03287AA-1109-4662-85B8-5E824B2EA646\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.209\",\"matchCriteriaId\":\"919C10A9-7951-4A74-BADD-C135A0A8D8B4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.175\",\"matchCriteriaId\":\"92385813-D91D-480D-83A1-F423D2CBB2BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.141\",\"matchCriteriaId\":\"97A9FFFA-22BB-4D5C-9790-5A2286E392F7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.91\",\"matchCriteriaId\":\"C918746B-DE6F-448F-A93E-A04C5481688D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.33\",\"matchCriteriaId\":\"96D99E49-380D-43AB-BDBA-25C3AD018A9C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linu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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:36:22+00:00",
      "cve": "CVE-2026-52982",
      "id": "CVE-2026-52982",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52982.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-21T23:52:03Z",
      "cve": "CVE-2026-52982",
      "id": "CVE-2026-52982",
      "initial_release_date": "2026-06-27T01:55:02Z",
      "product_status:known_affected": "209",
      "product_status:known_not_affected": "29",
      "product_status:recommended": "98",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-52982",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-52982.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.