CVE-2026-64333 (GCVE-0-2026-64333)
Vulnerability from cvelistv5
Published
2026-07-25 08:49
Modified
2026-08-17 04:53
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: USB: serial: digi_acceleport: fix write buffer corruption The digi_write_inb_command() is supposed to wait for the write urb to become available or return an error, but instead it updates the transfer buffer and tries to resubmit the urb on timeout. To make things worse, for commands like break control where no timeout is used, the driver would corrupt the urb immediately due to a broken jiffies comparison (on 32-bit machines this takes five minutes of uptime to trigger due to INITIAL_JIFFIES). Fix this by adding the missing return on timeout and waiting indefinitely when no timeout has been specified as intended. This issue was (sort of) flagged by Sashiko when reviewing an unrelated change to the driver.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/serial/digi_acceleport.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/serial/digi_acceleport.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "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",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.261",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
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                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.96",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: digi_acceleport: fix write buffer corruption\n\nThe digi_write_inb_command() is supposed to wait for the write urb to\nbecome available or return an error, but instead it updates the transfer\nbuffer and tries to resubmit the urb on timeout.\n\nTo make things worse, for commands like break control where no timeout\nis used, the driver would corrupt the urb immediately due to a broken\njiffies comparison (on 32-bit machines this takes five minutes of uptime\nto trigger due to INITIAL_JIFFIES).\n\nFix this by adding the missing return on timeout and waiting\nindefinitely when no timeout has been specified as intended.\n\nThis issue was (sort of) flagged by Sashiko when reviewing an unrelated\nchange to the driver."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerability is reached locally through write() followed by ioctl(TIOCCBRK) on an open Digi ttyUSB device; the attached adapter is a platform prerequisite rather than the attack entry point.\nAC:L - The attacker controls both URB submission and the competing break command and can repeat the sequence or stall transmission to widen the window. No uncontrollable race or memory layout is required.\nPR:L - No capability check exists in the ioctl path; the attacker only needs ordinary user-level permission to access the tty device node.\nUI:N - The attacker can open, write to, and issue the ioctl without another user performing any action.\nS:U - Compromise remains within the host kernel\u0027s security authority and is a standard local kernel privilege escalation rather than a VM, IOMMU, or distinct-scope escape.\nC:H - On controller-local-memory HCDs, the changed length can make USB completion restore the transfer-buffer pointer from attacker-controlled payload bytes. The resulting kernel-write and code-execution primitive can expose arbitrary kernel memory.\nI:H - A subsequent tty write dereferences the attacker-selected transfer-buffer pointer, providing an attacker-directed kernel overwrite with largely controlled contents. This can corrupt control data and plausibly achieve kernel code execution.\nA:H - The corrupted kernel pointer can immediately cause an oops or panic, while exploitation of the arbitrary overwrite can crash or hang the entire kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:53:36.100Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5d9dc88bdf8897788b0eed57113e9eca7fd42ea9"
        },
        {
          "url": "https://git.kernel.org/stable/c/2f296974acc279f05f284441bfe3064074958d11"
        },
        {
          "url": "https://git.kernel.org/stable/c/e60e4873e9178da9f4f2674e4c2ff085d5a84f79"
        },
        {
          "url": "https://git.kernel.org/stable/c/699dfb6917503b3cda4d5da6941cf79c3c1b4c8b"
        },
        {
          "url": "https://git.kernel.org/stable/c/a274b3794fe1852c3d9fe6d900b94053c0b03410"
        },
        {
          "url": "https://git.kernel.org/stable/c/1243f120790042c2ac92e84e797dacc75fff4366"
        },
        {
          "url": "https://git.kernel.org/stable/c/a3a13fdc53103b07335918e2cdeb465038a71725"
        },
        {
          "url": "https://git.kernel.org/stable/c/24ca1fea8f2753bf33e1d458ec1ae5d9b7796a65"
        }
      ],
      "title": "USB: serial: digi_acceleport: fix write buffer corruption",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64333",
    "datePublished": "2026-07-25T08:49:59.616Z",
    "dateReserved": "2026-07-19T15:36:31.781Z",
    "dateUpdated": "2026-08-17T04:53:36.100Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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