CVE-2026-64333 (GCVE-0-2026-64333)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-08-05 12:41
VLAI
Title
USB: serial: digi_acceleport: fix write buffer corruption
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5d9dc88bdf8897788b0eed57113e9eca7fd42ea9 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2f296974acc279f05f284441bfe3064074958d11 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e60e4873e9178da9f4f2674e4c2ff085d5a84f79 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 699dfb6917503b3cda4d5da6941cf79c3c1b4c8b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a274b3794fe1852c3d9fe6d900b94053c0b03410 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1243f120790042c2ac92e84e797dacc75fff4366 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a3a13fdc53103b07335918e2cdeb465038a71725 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 24ca1fea8f2753bf33e1d458ec1ae5d9b7796a65 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (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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{
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          "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": [
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            "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."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "dateReserved": "2026-07-19T15:36:31.781Z",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T08:28:15+00:00",
      "cve": "CVE-2026-64333",
      "id": "CVE-2026-64333",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: USB: serial: digi_acceleport: fix write buffer corruption",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64333.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

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  • 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.
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  • 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.