Vulnerability-Lookup

FKIE_CVE-2026-53194

Vulnerability from fkie_nvd - Published: 2026-06-25 09:16 - Updated: 2026-07-15 01:16

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.3 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: USB: serial: kl5kusb105: fix bulk-out buffer overflow klsi_105_prepare_write_buffer() is called by the generic write path with the bulk-out buffer and its size (bulk_out_size, 64 bytes). It stores a two-byte length header at the start of the buffer and copies the payload from the write fifo starting at buf + KLSI_HDR_LEN, but passes the full buffer size as the number of bytes to copy: count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size, &port->lock); When the fifo holds at least size bytes, size bytes are copied starting two bytes into the size-byte buffer, writing KLSI_HDR_LEN bytes past its end. Copy at most size - KLSI_HDR_LEN bytes instead, leaving room for the header as safe_serial already does. Writing bulk_out_size or more bytes to the tty triggers a slab out-of-bounds write, observed with KASAN by emulating the device with dummy_hcd and raw-gadget: BUG: KASAN: slab-out-of-bounds in kfifo_copy_out+0x83/0xc0 Write of size 64 at addr ffff888112c62202 by task python3 kfifo_copy_out klsi_105_prepare_write_buffer [kl5kusb105] usb_serial_generic_write_start [usbserial] Allocated by task 139: usb_serial_probe [usbserial] The buggy address is located 2 bytes inside of allocated 64-byte region The out-of-bounds write no longer occurs with this change applied.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0a57320f71941d4e0b1307453c9a1f0939afe666	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/14147b7963685957839c76ba8094924e22777d79	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/372f33ebed747d91870f57c0a2e62884a870bffa	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/60af1fd82983c26604102e63a3fcc822c186cceb	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/70d86e355c564b5510fde61361df014f5476c83e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/96d47e40bf9db4a9efd5c8fb53287a508d165f14	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a1288cd700f721c1a119c4f1e8efa234e59caada	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/bde742b076cbe26ecc89c8c68c76ae076a524d02	Patch
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-53194	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2492703	Issue Tracking, Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53194.json	Third Party Advisory

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1

JSON

To clipboard

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: kl5kusb105: fix bulk-out buffer overflow\n\nklsi_105_prepare_write_buffer() is called by the generic write path\nwith the bulk-out buffer and its size (bulk_out_size, 64 bytes). It\nstores a two-byte length header at the start of the buffer and copies\nthe payload from the write fifo starting at buf + KLSI_HDR_LEN, but\npasses the full buffer size as the number of bytes to copy:\n\n  count = kfifo_out_locked(\u0026port-\u003ewrite_fifo, buf + KLSI_HDR_LEN,\n                           size, \u0026port-\u003elock);\n\nWhen the fifo holds at least size bytes, size bytes are copied starting\ntwo bytes into the size-byte buffer, writing KLSI_HDR_LEN bytes past its\nend. Copy at most size - KLSI_HDR_LEN bytes instead, leaving room for\nthe header as safe_serial already does.\n\nWriting bulk_out_size or more bytes to the tty triggers a slab\nout-of-bounds write, observed with KASAN by emulating the device with\ndummy_hcd and raw-gadget:\n\n  BUG: KASAN: slab-out-of-bounds in kfifo_copy_out+0x83/0xc0\n  Write of size 64 at addr ffff888112c62202 by task python3\n   kfifo_copy_out\n   klsi_105_prepare_write_buffer [kl5kusb105]\n   usb_serial_generic_write_start [usbserial]\n  Allocated by task 139:\n   usb_serial_probe [usbserial]\n  The buggy address is located 2 bytes inside of allocated 64-byte region\n\nThe out-of-bounds write no longer occurs with this change applied."
    }
  ],
  "id": "CVE-2026-53194",
  "lastModified": "2026-07-15T01:16:30.943",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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        "type": "Secondary"
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          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
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          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H",
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        "type": "Secondary"
      }
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  "published": "2026-06-25T09:16:36.850",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    },
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      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
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      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "type": "Secondary"
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}

CVE-2026-53194 (GCVE-0-2026-53194)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-08-05 12:34

Title

USB: serial: kl5kusb105: fix bulk-out buffer overflow

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

5.3 (Medium)


                        
                          CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H

CWE

CWE-787 - Out-of-bounds Write

Assigner

Linux mitre root

References

11 references

URL	Tags
https://git.kernel.org/stable/c/60af1fd82983c2660…
https://git.kernel.org/stable/c/0a57320f71941d4e0…
https://git.kernel.org/stable/c/14147b79636859578…
https://git.kernel.org/stable/c/a1288cd700f721c1a…
https://git.kernel.org/stable/c/70d86e355c564b551…
https://git.kernel.org/stable/c/372f33ebed747d918…
https://git.kernel.org/stable/c/bde742b076cbe26ec…
https://git.kernel.org/stable/c/96d47e40bf9db4a9e…
https://access.redhat.com/security/cve/CVE-2026-53194	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2492703	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex

Impacted products

7 products

Vendor	Product	Version
Linux	Linux	Affected: 60b3013cdaf3fa8a17243ca46b19db3cbe08d943 , < 60af1fd82983c26604102e63a3fcc822c186cceb (git) Affected: 60b3013cdaf3fa8a17243ca46b19db3cbe08d943 , < 0a57320f71941d4e0b1307453c9a1f0939afe666 (git) Affected: 60b3013cdaf3fa8a17243ca46b19db3cbe08d943 , < 14147b7963685957839c76ba8094924e22777d79 (git) Affected: 60b3013cdaf3fa8a17243ca46b19db3cbe08d943 , < a1288cd700f721c1a119c4f1e8efa234e59caada (git) Affected: 60b3013cdaf3fa8a17243ca46b19db3cbe08d943 , < 70d86e355c564b5510fde61361df014f5476c83e (git) Affected: 60b3013cdaf3fa8a17243ca46b19db3cbe08d943 , < 372f33ebed747d91870f57c0a2e62884a870bffa (git) Affected: 60b3013cdaf3fa8a17243ca46b19db3cbe08d943 , < bde742b076cbe26ecc89c8c68c76ae076a524d02 (git) Affected: 60b3013cdaf3fa8a17243ca46b19db3cbe08d943 , < 96d47e40bf9db4a9efd5c8fb53287a508d165f14 (git)
Linux	Linux	Affected: 2.6.35 Unaffected: 0 , < 2.6.35 (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: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9

Show details on NVD website

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{
  "containers": {
    "adp": [
      {
        "affected": [
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            "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
            "cpes": [
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            "defaultStatus": "affected",
            "packageName": "kernel",
            "product": "Red Hat Enterprise Linux 10",
            "vendor": "Red Hat"
          },
          {
            "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:6"
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            "defaultStatus": "unaffected",
            "packageName": "kernel",
            "product": "Red Hat Enterprise Linux 6",
            "vendor": "Red Hat"
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            "cpes": [
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            "defaultStatus": "affected",
            "packageName": "kernel",
            "product": "Red Hat Enterprise Linux 7",
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            "cpes": [
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            "packageName": "kernel",
            "product": "Red Hat Enterprise Linux 8",
            "vendor": "Red Hat"
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            "cpes": [
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            "defaultStatus": "affected",
            "packageName": "kernel-rt",
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            "cpes": [
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            "defaultStatus": "affected",
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            "packageName": "kernel-rt",
            "product": "Red Hat Enterprise Linux 9",
            "vendor": "Red Hat"
          }
        ],
        "datePublic": "2026-06-25T00:00:00.000Z",
        "descriptions": [
          {
            "lang": "en",
            "value": "A flaw was found in the Linux kernel\u0027s `kl5kusb105` USB serial driver. This buffer overflow vulnerability allows a local attacker to write data beyond the intended memory boundary (if attacker controls USB device or driver, because triggered from the internals of the device). By sending a specially crafted input to the USB serial port, an attacker can trigger an out-of-bounds write, which may lead to memory corruption. The primary consequence of this flaw is a denial of service (DoS), potentially causing system instability or crashes."
          }
        ],
        "metrics": [
          {
            "other": {
              "content": {
                "namespace": "https://access.redhat.com/security/updates/classification/",
                "value": "Moderate"
              },
              "type": "Red Hat severity rating"
            }
          },
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.3,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "LOW",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H",
              "version": "3.1"
            },
            "format": "CVSS"
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-787",
                "description": "Out-of-bounds Write",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-15T00:44:36.635Z",
          "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
          "shortName": "redhat-SADP"
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            "tags": [
              "vdb-entry",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/security/cve/CVE-2026-53194"
          },
          {
            "name": "RHBZ#2492703",
            "tags": [
              "issue-tracking",
              "x_refsource_REDHAT"
            ],
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492703"
          },
          {
            "tags": [
              "x_sadp-csaf-vex"
            ],
            "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53194.json"
          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2026-06-25T00:00:00.000Z",
            "value": "Reported to Red Hat."
          },
          {
            "lang": "en",
            "time": "2026-06-25T00:00:00.000Z",
            "value": "Made public."
          }
        ],
        "title": "kernel: USB: serial: kl5kusb105: fix bulk-out buffer overflow",
        "workarounds": [
          {
            "lang": "en",
            "value": "To mitigate this issue, prevent module kl5kusb105 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically."
          }
        ],
        "x_adpType": "supplier",
        "x_generator": {
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    ],
    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/serial/kl5kusb105.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "60af1fd82983c26604102e63a3fcc822c186cceb",
              "status": "affected",
              "version": "60b3013cdaf3fa8a17243ca46b19db3cbe08d943",
              "versionType": "git"
            },
            {
              "lessThan": "0a57320f71941d4e0b1307453c9a1f0939afe666",
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              "status": "affected",
              "version": "2.6.35"
            },
            {
              "lessThan": "2.6.35",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.259",
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            },
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              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
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            },
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
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            },
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              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
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            },
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              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: kl5kusb105: fix bulk-out buffer overflow\n\nklsi_105_prepare_write_buffer() is called by the generic write path\nwith the bulk-out buffer and its size (bulk_out_size, 64 bytes). It\nstores a two-byte length header at the start of the buffer and copies\nthe payload from the write fifo starting at buf + KLSI_HDR_LEN, but\npasses the full buffer size as the number of bytes to copy:\n\n  count = kfifo_out_locked(\u0026port-\u003ewrite_fifo, buf + KLSI_HDR_LEN,\n                           size, \u0026port-\u003elock);\n\nWhen the fifo holds at least size bytes, size bytes are copied starting\ntwo bytes into the size-byte buffer, writing KLSI_HDR_LEN bytes past its\nend. Copy at most size - KLSI_HDR_LEN bytes instead, leaving room for\nthe header as safe_serial already does.\n\nWriting bulk_out_size or more bytes to the tty triggers a slab\nout-of-bounds write, observed with KASAN by emulating the device with\ndummy_hcd and raw-gadget:\n\n  BUG: KASAN: slab-out-of-bounds in kfifo_copy_out+0x83/0xc0\n  Write of size 64 at addr ffff888112c62202 by task python3\n   kfifo_copy_out\n   klsi_105_prepare_write_buffer [kl5kusb105]\n   usb_serial_generic_write_start [usbserial]\n  Allocated by task 139:\n   usb_serial_probe [usbserial]\n  The buggy address is located 2 bytes inside of allocated 64-byte region\n\nThe out-of-bounds write no longer occurs with this change applied."
        }
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            "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",
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          },
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            {
              "lang": "en",
              "value": "AV:L - Although this is USB serial code, the vulnerable copy is reached by a local write to the registered /dev/ttyUSB device once a matching adapter is present.\nAC:L - Writing bulk_out_size or more bytes deterministically fills the FIFO and triggers the out-of-bounds copy; no race or attacker-uncontrolled timing is required.\nPR:L - There is no capability or authentication check in the tty/USB-serial write path, but the attacker needs local access to open and write the tty device.\nUI:N - The attacker can trigger the bug directly by writing to the tty device; no separate victim action is required.\nS:U - The corruption occurs within the host kernel and does not cross a VM, IOMMU, or similar security authority boundary.\nC:H - The bug is kernel heap memory corruption, and the overlong bulk-out URB may also expose adjacent heap bytes to the USB device.\nI:H - The attacker controls the data copied past the 64-byte bulk-out buffer, making this an out-of-bounds kernel heap write.\nA:H - The issue was observed as a KASAN slab out-of-bounds write and can reasonably cause kernel memory corruption, oops, or panic."
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:34:00.760Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/60af1fd82983c26604102e63a3fcc822c186cceb"
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        {
          "url": "https://git.kernel.org/stable/c/0a57320f71941d4e0b1307453c9a1f0939afe666"
        },
        {
          "url": "https://git.kernel.org/stable/c/14147b7963685957839c76ba8094924e22777d79"
        },
        {
          "url": "https://git.kernel.org/stable/c/a1288cd700f721c1a119c4f1e8efa234e59caada"
        },
        {
          "url": "https://git.kernel.org/stable/c/70d86e355c564b5510fde61361df014f5476c83e"
        },
        {
          "url": "https://git.kernel.org/stable/c/372f33ebed747d91870f57c0a2e62884a870bffa"
        },
        {
          "url": "https://git.kernel.org/stable/c/bde742b076cbe26ecc89c8c68c76ae076a524d02"
        },
        {
          "url": "https://git.kernel.org/stable/c/96d47e40bf9db4a9efd5c8fb53287a508d165f14"
        }
      ],
      "title": "USB: serial: kl5kusb105: fix bulk-out buffer overflow",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53194",
    "datePublished": "2026-06-25T08:39:05.017Z",
    "dateReserved": "2026-06-09T07:44:35.390Z",
    "dateUpdated": "2026-08-05T12:34:00.760Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.