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GHSA-X846-472J-JJ99

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64331"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:14Z",
    "severity": null
  },
  "details": "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",
  "id": "GHSA-x846-472j-jj99",
  "modified": "2026-07-25T12:31:31Z",
  "published": "2026-07-25T12:31:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64331"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0025276175fbbe0dcbf3f84d090b0adee769e9d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0443e4416aa1ee97748d1ed904eaf3352c60045e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1226293ec9bed3d4cc5b05eeeb811d315ca51652"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/347b59e9f96719d89b6ef555d02a18ada1a5846f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3750f75f29f99c0223601e2ee73ad084adec47bd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9858c91d9ee6a13c45311569039413729fc9b757"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5371e0b91b24159a3ebaa61e70b0980bcf03c0a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-07-25 08:49

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

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/9858c91d9ee6a13c4…
https://git.kernel.org/stable/c/1226293ec9bed3d4c…
https://git.kernel.org/stable/c/3750f75f29f99c022…
https://git.kernel.org/stable/c/d0ebf9cc7c2ddf95a…
https://git.kernel.org/stable/c/0025276175fbbe0dc…
https://git.kernel.org/stable/c/347b59e9f96719d89…
https://git.kernel.org/stable/c/0443e4416aa1ee977…
https://git.kernel.org/stable/c/c5371e0b91b24159a…

Impacted products

2 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)
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)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "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",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "9858c91d9ee6a13c45311569039413729fc9b757",
              "status": "affected",
              "version": "b6a0ca11186759ad7045d68a5447b1e89f658384",
              "versionType": "git"
            },
            {
              "lessThan": "1226293ec9bed3d4cc5b05eeeb811d315ca51652",
              "status": "affected",
              "version": "b6a0ca11186759ad7045d68a5447b1e89f658384",
              "versionType": "git"
            },
            {
              "lessThan": "3750f75f29f99c0223601e2ee73ad084adec47bd",
              "status": "affected",
              "version": "b6a0ca11186759ad7045d68a5447b1e89f658384",
              "versionType": "git"
            },
            {
              "lessThan": "d0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97",
              "status": "affected",
              "version": "b6a0ca11186759ad7045d68a5447b1e89f658384",
              "versionType": "git"
            },
            {
              "lessThan": "0025276175fbbe0dcbf3f84d090b0adee769e9d9",
              "status": "affected",
              "version": "b6a0ca11186759ad7045d68a5447b1e89f658384",
              "versionType": "git"
            },
            {
              "lessThan": "347b59e9f96719d89b6ef555d02a18ada1a5846f",
              "status": "affected",
              "version": "b6a0ca11186759ad7045d68a5447b1e89f658384",
              "versionType": "git"
            },
            {
              "lessThan": "0443e4416aa1ee97748d1ed904eaf3352c60045e",
              "status": "affected",
              "version": "b6a0ca11186759ad7045d68a5447b1e89f658384",
              "versionType": "git"
            },
            {
              "lessThan": "c5371e0b91b24159a3ebaa61e70b0980bcf03c0a",
              "status": "affected",
              "version": "b6a0ca11186759ad7045d68a5447b1e89f658384",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "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",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.7"
            },
            {
              "lessThan": "4.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
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            {
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
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                {
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              "operator": "OR"
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      "descriptions": [
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          "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"
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        "dateUpdated": "2026-07-25T08:49:58.370Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/d0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97"
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          "url": "https://git.kernel.org/stable/c/0443e4416aa1ee97748d1ed904eaf3352c60045e"
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        {
          "url": "https://git.kernel.org/stable/c/c5371e0b91b24159a3ebaa61e70b0980bcf03c0a"
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      "title": "usbip: vudc: fix NULL deref in vep_dequeue()",
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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",
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}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

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GHSA-X846-472J-JJ99

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

Tags

Sightings

Nomenclature