CVE-2026-64331 (GCVE-0-2026-64331)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-07-25 08:49
VLAI
Title
usbip: vudc: fix NULL deref in vep_dequeue()
Summary
In the Linux kernel, the following vulnerability has been resolved: usbip: vudc: fix NULL deref in vep_dequeue() vep_alloc_request() wasn't initializing vrequest->udc, so cancellations on the FunctionFS AIO path were arriving in vep_dequeue without a valid UDC reference. Since vrequest->udc is never actually properly used anywhere, we opt to remove it, and update vep_dequeue to obtain a reference to the udc with ep_to_vudc(), consistent with the other vep_ ops. AFAICT this bug has existed for ~10 years. Seems that nobody has really stressed the FunctionFS AIO path on usbip's vudc. I tested this fix in a QEMU aarch64 guest driving FunctionFS endpoints via AIO. Before the fix, running `usbip attach` from the host would cause the guest to oops with the following backtrace: Call trace: vep_dequeue+0x1c/0xe4 (P) usb_ep_dequeue+0x14/0x20 ffs_aio_cancel+0x24/0x34 __arm64_sys_io_cancel+0xb0/0x124 do_el0_svc+0x68/0x100 el0_svc+0x18/0x5c el0t_64_sync_handler+0x98/0xdc el0t_64_sync+0x154/0x158
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b6a0ca11186759ad7045d68a5447b1e89f658384 , < 9858c91d9ee6a13c45311569039413729fc9b757 (git)
Affected: b6a0ca11186759ad7045d68a5447b1e89f658384 , < 1226293ec9bed3d4cc5b05eeeb811d315ca51652 (git)
Affected: b6a0ca11186759ad7045d68a5447b1e89f658384 , < 3750f75f29f99c0223601e2ee73ad084adec47bd (git)
Affected: b6a0ca11186759ad7045d68a5447b1e89f658384 , < d0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97 (git)
Affected: b6a0ca11186759ad7045d68a5447b1e89f658384 , < 0025276175fbbe0dcbf3f84d090b0adee769e9d9 (git)
Affected: b6a0ca11186759ad7045d68a5447b1e89f658384 , < 347b59e9f96719d89b6ef555d02a18ada1a5846f (git)
Affected: b6a0ca11186759ad7045d68a5447b1e89f658384 , < 0443e4416aa1ee97748d1ed904eaf3352c60045e (git)
Affected: b6a0ca11186759ad7045d68a5447b1e89f658384 , < c5371e0b91b24159a3ebaa61e70b0980bcf03c0a (git)
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Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
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              "versionType": "original_commit_for_fix"
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                  "vulnerable": true
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusbip: vudc: fix NULL deref in vep_dequeue()\n\nvep_alloc_request() wasn\u0027t initializing vrequest-\u003eudc, so cancellations\non the FunctionFS AIO path were arriving in vep_dequeue without a valid\nUDC reference.\n\nSince vrequest-\u003eudc is never actually properly used anywhere, we opt to\nremove it, and update vep_dequeue to obtain a reference to the udc with\nep_to_vudc(), consistent with the other vep_ ops.\n\nAFAICT this bug has existed for ~10 years. Seems that nobody has really\nstressed the FunctionFS AIO path on usbip\u0027s vudc.\n\nI tested this fix in a QEMU aarch64 guest driving FunctionFS endpoints\nvia AIO. Before the fix, running `usbip attach` from the host would\ncause the guest to oops with the following backtrace:\n\nCall trace:\n vep_dequeue+0x1c/0xe4 (P)\n usb_ep_dequeue+0x14/0x20\n ffs_aio_cancel+0x24/0x34\n __arm64_sys_io_cancel+0xb0/0x124\n do_el0_svc+0x68/0x100\n el0_svc+0x18/0x5c\n el0t_64_sync_handler+0x98/0xdc\n el0t_64_sync+0x154/0x158"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:49:58.370Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/9858c91d9ee6a13c45311569039413729fc9b757"
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        {
          "url": "https://git.kernel.org/stable/c/3750f75f29f99c0223601e2ee73ad084adec47bd"
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        },
        {
          "url": "https://git.kernel.org/stable/c/c5371e0b91b24159a3ebaa61e70b0980bcf03c0a"
        }
      ],
      "title": "usbip: vudc: fix NULL deref in vep_dequeue()",
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      }
    }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64331",
    "datePublished": "2026-07-25T08:49:58.370Z",
    "dateReserved": "2026-07-19T15:36:31.781Z",
    "dateUpdated": "2026-07-25T08:49:58.370Z",
    "state": "PUBLISHED"
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      "date": "2026-07-26",
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      "percentile": "0.07467"
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      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "usbip: vudc: fix NULL deref in vep_dequeue()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64331.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64331\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:14.813\",\"lastModified\":\"2026-07-25T10:17:14.813\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusbip: vudc: fix NULL deref in vep_dequeue()\\n\\nvep_alloc_request() wasn\u0027t initializing vrequest-\u003eudc, so cancellations\\non the FunctionFS AIO path were arriving in vep_dequeue without a valid\\nUDC reference.\\n\\nSince vrequest-\u003eudc is never actually properly used anywhere, we opt to\\nremove it, and update vep_dequeue to obtain a reference to the udc with\\nep_to_vudc(), consistent with the other vep_ ops.\\n\\nAFAICT this bug has existed for ~10 years. Seems that nobody has really\\nstressed the FunctionFS AIO path on usbip\u0027s vudc.\\n\\nI tested this fix in a QEMU aarch64 guest driving FunctionFS endpoints\\nvia AIO. Before the fix, running `usbip attach` from the host would\\ncause the guest to oops with the following backtrace:\\n\\nCall trace:\\n vep_dequeue+0x1c/0xe4 (P)\\n usb_ep_dequeue+0x14/0x20\\n ffs_aio_cancel+0x24/0x34\\n __arm64_sys_io_cancel+0xb0/0x124\\n do_el0_svc+0x68/0x100\\n el0_svc+0x18/0x5c\\n el0t_64_sync_handler+0x98/0xdc\\n el0t_64_sync+0x154/0x158\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/usbip/vudc.h\",\"drivers/usb/usbip/vudc_dev.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b6a0ca11186759ad7045d68a5447b1e89f658384\",\"lessThan\":\"9858c91d9ee6a13c45311569039413729fc9b757\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b6a0ca11186759ad7045d68a5447b1e89f658384\",\"lessThan\":\"1226293ec9bed3d4cc5b05eeeb811d315ca51652\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b6a0ca11186759ad7045d68a5447b1e89f658384\",\"lessThan\":\"3750f75f29f99c0223601e2ee73ad084adec47bd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b6a0ca11186759ad7045d68a5447b1e89f658384\",\"lessThan\":\"d0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b6a0ca11186759ad7045d68a5447b1e89f658384\",\"lessThan\":\"0025276175fbbe0dcbf3f84d090b0adee769e9d9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b6a0ca11186759ad7045d68a5447b1e89f658384\",\"lessThan\":\"347b59e9f96719d89b6ef555d02a18ada1a5846f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b6a0ca11186759ad7045d68a5447b1e89f658384\",\"lessThan\":\"0443e4416aa1ee97748d1ed904eaf3352c60045e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b6a0ca11186759ad7045d68a5447b1e89f658384\",\"lessThan\":\"c5371e0b91b24159a3ebaa61e70b0980bcf03c0a\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/usbip/vudc.h\",\"drivers/usb/usbip/vudc_dev.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0025276175fbbe0dcbf3f84d090b0adee769e9d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0443e4416aa1ee97748d1ed904eaf3352c60045e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1226293ec9bed3d4cc5b05eeeb811d315ca51652\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/347b59e9f96719d89b6ef555d02a18ada1a5846f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3750f75f29f99c0223601e2ee73ad084adec47bd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9858c91d9ee6a13c45311569039413729fc9b757\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c5371e0b91b24159a3ebaa61e70b0980bcf03c0a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:01:42Z",
      "cve": "CVE-2026-64331",
      "id": "CVE-2026-64331",
      "initial_release_date": "2026-07-25T16:01:42Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64331",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64331.json",
      "version": "2"
    }
  }
}



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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

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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.