CVE-2026-63903 (GCVE-0-2026-63903)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-19 14:55
VLAI
Title
USB: serial: belkin_sa: validate interrupt status length
Summary
In the Linux kernel, the following vulnerability has been resolved: USB: serial: belkin_sa: validate interrupt status length The Belkin interrupt callback treats interrupt data as a four-byte status report and reads LSR/MSR fields at offsets 2 and 3. The interrupt-in buffer length is derived from endpoint wMaxPacketSize, and short interrupt transfers may complete successfully with a smaller actual_length. Check the completed interrupt packet length before parsing status fields so short interrupt endpoints and short successful packets are ignored instead of causing out-of-bounds or stale status-byte reads. KASAN report as below: BUG: KASAN: slab-out-of-bounds in belkin_sa_read_int_callback() Read of size 1 Call trace: belkin_sa_read_int_callback() (drivers/usb/serial/belkin_sa.c:202) __usb_hcd_giveback_urb() (drivers/usb/core/hcd.c:1630) dummy_timer() (?:?)
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f1617539ab90e67da788959bfd314076f093a11a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f361359a952da15e70e693c2d7dca5c5843eae3e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 37e54d1b986df35c936d81e5b59a7aa3ec6938f0 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ffb739a49186ea784bbd9cb91b647f062395b419 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6a4602221cba7a738442328d66a2f0b1c9bf6e17 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 22823a319fb2afdf02cacafbed8b613b757efbc8 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < db1e7eb6203d534dad64cac2c793b69e561e657b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4ce058df2ee02cc2a0f0fd5cd64ce6f1482a0b65 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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      "cpeApplicability": [
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: belkin_sa: validate interrupt status length\n\nThe Belkin interrupt callback treats interrupt data as a four-byte\nstatus report and reads LSR/MSR fields at offsets 2 and 3. The\ninterrupt-in buffer length is derived from endpoint wMaxPacketSize, and\nshort interrupt transfers may complete successfully with a smaller\nactual_length.\n\nCheck the completed interrupt packet length before parsing status\nfields so short interrupt endpoints and short successful packets are\nignored instead of causing out-of-bounds or stale status-byte reads.\n\nKASAN report as below:\n\nBUG: KASAN: slab-out-of-bounds in belkin_sa_read_int_callback()\nRead of size 1\nCall trace:\n  belkin_sa_read_int_callback() (drivers/usb/serial/belkin_sa.c:202)\n  __usb_hcd_giveback_urb() (drivers/usb/core/hcd.c:1630)\n  dummy_timer() (?:?)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T14:55:10.905Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f1617539ab90e67da788959bfd314076f093a11a"
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        {
          "url": "https://git.kernel.org/stable/c/f361359a952da15e70e693c2d7dca5c5843eae3e"
        },
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          "url": "https://git.kernel.org/stable/c/37e54d1b986df35c936d81e5b59a7aa3ec6938f0"
        },
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        },
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      ],
      "title": "USB: serial: belkin_sa: validate interrupt status length",
      "x_generator": {
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      }
    }
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63903",
    "datePublished": "2026-07-19T14:55:10.905Z",
    "dateReserved": "2026-07-19T07:54:57.019Z",
    "dateUpdated": "2026-07-19T14:55:10.905Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-09-21",
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      "percentile": "0.12703"
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: belkin_sa: validate interrupt status length\n\nThe Belkin interrupt callback treats interrupt data as a four-byte\nstatus report and reads LSR/MSR fields at offsets 2 and 3. The\ninterrupt-in buffer length is derived from endpoint wMaxPacketSize, and\nshort interrupt transfers may complete successfully with a smaller\nactual_length.\n\nCheck the completed interrupt packet length before parsing status\nfields so short interrupt endpoints and short successful packets are\nignored instead of causing out-of-bounds or stale status-byte reads.\n\nKASAN report as below:\n\nBUG: KASAN: slab-out-of-bounds in belkin_sa_read_int_callback()\nRead of size 1\nCall trace:\n  belkin_sa_read_int_callback() (drivers/usb/serial/belkin_sa.c:202)\n  __usb_hcd_giveback_urb() (drivers/usb/core/hcd.c:1630)\n  dummy_timer() (?:?)"
          }
        ],
        "id": "CVE-2026-63903",
        "lastModified": "2026-07-27T17:44:23.777",
        "metrics": {},
        "published": "2026-07-19T16:17:08.000",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ffb739a49186ea784bbd9cb91b647f062395b419"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-21T21:09:09+00:00",
      "cve": "CVE-2026-63903",
      "id": "CVE-2026-63903",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: USB: serial: belkin_sa: validate interrupt status length",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63903.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T02:30:32Z",
      "cve": "CVE-2026-63903",
      "id": "CVE-2026-63903",
      "initial_release_date": "2026-07-21T13:03:54Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "454",
      "product_status:known_not_affected": "267",
      "product_status:recommended": "250",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63903",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63903.json",
      "version": "13"
    }
  }
}



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