CVE-2026-46167 (GCVE-0-2026-46167)
Vulnerability from cvelistv5
Published
2026-05-28 09:36
Modified
2026-06-14 17:59
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: usblp: fix uninitialized heap leak via LPGETSTATUS ioctl Just like in a previous problem in this driver, usblp_ctrl_msg() will collapse the usb_control_msg() return value to 0/-errno, discarding the actual number of bytes transferred. Ideally that short command should be detected and error out, but many printers are known to send "incorrect" responses back so we can't just do that. statusbuf is kmalloc(8) at probe time and never filled before the first LPGETSTATUS ioctl. usblp_read_status() requests 1 byte. If a malicious printer responds with zero bytes, *statusbuf is one byte of stale kmalloc heap, sign-extended into the local int status, which the LPGETSTATUS path then copy_to_user()s directly to the ioctl caller. Fix this all by just zapping out the memory buffer when allocated at probe time. If a later call does a short read, the data will be identical to what the device sent it the last time, so there is no "leak" of information happening.
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/class/usblp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/class/usblp.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": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
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            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.140",
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              "lessThanOrEqual": "6.12.*",
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              "version": "6.12.88",
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              "lessThanOrEqual": "6.18.*",
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              "version": "6.18.30",
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              "version": "7.0.7",
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            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "versionEndExcluding": "6.18.30",
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                  "versionEndExcluding": "7.1",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: usblp: fix uninitialized heap leak via LPGETSTATUS ioctl\n\nJust like in a previous problem in this driver, usblp_ctrl_msg() will\ncollapse the usb_control_msg() return value to 0/-errno, discarding the\nactual number of bytes transferred.\n\nIdeally that short command should be detected and error out, but many\nprinters are known to send \"incorrect\" responses back so we can\u0027t just\ndo that.\n\nstatusbuf is kmalloc(8) at probe time and never filled before the first\nLPGETSTATUS ioctl.\n\nusblp_read_status() requests 1 byte. If a malicious printer responds\nwith zero bytes, *statusbuf is one byte of stale kmalloc heap,\nsign-extended into the local int status, which the LPGETSTATUS path then\ncopy_to_user()s directly to the ioctl caller.\n\nFix this all by just zapping out the memory buffer when allocated at\nprobe time.  If a later call does a short read, the data will be\nidentical to what the device sent it the last time, so there is no\n\"leak\" of information happening."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:59:37.617Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0f7c41314ebf17049917a452684db371babf711a"
        },
        {
          "url": "https://git.kernel.org/stable/c/cf24991619be317e2769310b4a367bf4a04b82bc"
        },
        {
          "url": "https://git.kernel.org/stable/c/087d97342c100138ea7d75a50977c9c2319f957b"
        },
        {
          "url": "https://git.kernel.org/stable/c/d06d937b0a4cdb8867f04275c8100a8b943da31a"
        },
        {
          "url": "https://git.kernel.org/stable/c/a502b997668401a6821501fc98b7f9220f9b6ff2"
        },
        {
          "url": "https://git.kernel.org/stable/c/762a6ccf391db0d629e590a803a3a2231e17dd3f"
        },
        {
          "url": "https://git.kernel.org/stable/c/6b0e7438e31c74b01514d31ff35c1e688c4baaba"
        },
        {
          "url": "https://git.kernel.org/stable/c/b38e53cbfb9d84732e5984fbd73e128d592415c5"
        }
      ],
      "title": "usb: usblp: fix uninitialized heap leak via LPGETSTATUS ioctl",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46167",
    "datePublished": "2026-05-28T09:36:22.434Z",
    "dateReserved": "2026-05-13T15:03:33.102Z",
    "dateUpdated": "2026-06-14T17:59:37.617Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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