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FKIE_CVE-2026-80827

Vulnerability from fkie_nvd - Published: 2026-09-04 16:18 - Updated: 2026-09-04 16:18
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: USB: serial: option: fix slab OOB read in interrupt URB callback The interrupt URB buffer is allocated in setup_port_interrupt_in() based on the endpoint's wMaxPacketSize: buffer_size = usb_endpoint_maxp(epd); port->interrupt_in_buffer = kmalloc(buffer_size, GFP_KERNEL); When a USB device declares wMaxPacketSize = 8 on its interrupt IN endpoint, the buffer is allocated from kmalloc-8 cache (exactly 8 bytes). If the device sends a short packet (actual_length < wMaxPacketSize), the URB completes with status == 0 and the callback proceeds to read: data[sizeof(struct usb_ctrlrequest)] which evaluates to data[8], accessing 1 byte beyond the allocated 8-byte buffer. This results in a slab out-of-bounds read. Fix this by adding the missing bounds check: first verify that the actual length is large enough to contain the struct usb_ctrlrequest header before accessing req_pkt->bRequestType and req_pkt->bRequest, and then verify that there is an additional byte for the modem signal state before reading data[sizeof(struct usb_ctrlrequest)] inside the conditional. Use sizeof(*req_pkt) instead of sizeof(struct usb_ctrlrequest) for consistency. [ johan: use dev_err(); split signals declaration and initialisation ]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/030e3a73d3c3aa67c44454649e984d6383cdb7d3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/060db7d48af1e650643c8b8319111a9ea2ce4486
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2ef5560387f2c0713cee975be2b24b281bd90f3e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/885d802f544ca7bfa8f3984d94233cce715bb6b3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/94e5525697b9e91ddc4071129874120a50a4f342
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a72a13c83a652516a0e469d275b81d29a7429049
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d762aef4eba354066be21a5d88eb2066e282f4c9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fbe60fd2abc8a5561f39719a41ad9a01b5d8e567
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/serial/option.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fbe60fd2abc8a5561f39719a41ad9a01b5d8e567",
              "status": "affected",
              "version": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
              "versionType": "git"
            },
            {
              "lessThan": "94e5525697b9e91ddc4071129874120a50a4f342",
              "status": "affected",
              "version": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
              "versionType": "git"
            },
            {
              "lessThan": "6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec",
              "status": "affected",
              "version": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
              "versionType": "git"
            },
            {
              "lessThan": "030e3a73d3c3aa67c44454649e984d6383cdb7d3",
              "status": "affected",
              "version": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
              "versionType": "git"
            },
            {
              "lessThan": "060db7d48af1e650643c8b8319111a9ea2ce4486",
              "status": "affected",
              "version": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
              "versionType": "git"
            },
            {
              "lessThan": "2ef5560387f2c0713cee975be2b24b281bd90f3e",
              "status": "affected",
              "version": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
              "versionType": "git"
            },
            {
              "lessThan": "a72a13c83a652516a0e469d275b81d29a7429049",
              "status": "affected",
              "version": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
              "versionType": "git"
            },
            {
              "lessThan": "d762aef4eba354066be21a5d88eb2066e282f4c9",
              "status": "affected",
              "version": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
              "versionType": "git"
            },
            {
              "lessThan": "885d802f544ca7bfa8f3984d94233cce715bb6b3",
              "status": "affected",
              "version": "58cfe9113e485f7e04bd0eac4fc4251b330af501",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/serial/option.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": "5.10.269",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.220",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.187",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.156",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.108",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.49",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: option: fix slab OOB read in interrupt URB callback\n\nThe interrupt URB buffer is allocated in setup_port_interrupt_in() based\non the endpoint\u0027s wMaxPacketSize:\n\n    buffer_size = usb_endpoint_maxp(epd);\n    port-\u003einterrupt_in_buffer = kmalloc(buffer_size, GFP_KERNEL);\n\nWhen a USB device declares wMaxPacketSize = 8 on its interrupt IN\nendpoint, the buffer is allocated from kmalloc-8 cache (exactly\n8 bytes).\n\nIf the device sends a short packet (actual_length \u003c wMaxPacketSize),\nthe URB completes with status == 0 and the callback proceeds to read:\n\n    data[sizeof(struct usb_ctrlrequest)]\n\nwhich evaluates to data[8], accessing 1 byte beyond the allocated 8-byte\nbuffer. This results in a slab out-of-bounds read.\n\nFix this by adding the missing bounds check: first verify that the\nactual length is large enough to contain the struct usb_ctrlrequest\nheader before accessing req_pkt-\u003ebRequestType and req_pkt-\u003ebRequest,\nand then verify that there is an additional byte for the modem signal\nstate before reading data[sizeof(struct usb_ctrlrequest)] inside the\nconditional.  Use sizeof(*req_pkt) instead of sizeof(struct\nusb_ctrlrequest) for consistency.\n\n[ johan: use dev_err(); split signals declaration and initialisation ]"
    }
  ],
  "id": "CVE-2026-80827",
  "lastModified": "2026-09-04T16:18:10.683",
  "metrics": {},
  "published": "2026-09-04T16:18:10.683",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/030e3a73d3c3aa67c44454649e984d6383cdb7d3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/060db7d48af1e650643c8b8319111a9ea2ce4486"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2ef5560387f2c0713cee975be2b24b281bd90f3e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/885d802f544ca7bfa8f3984d94233cce715bb6b3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/94e5525697b9e91ddc4071129874120a50a4f342"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a72a13c83a652516a0e469d275b81d29a7429049"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d762aef4eba354066be21a5d88eb2066e282f4c9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fbe60fd2abc8a5561f39719a41ad9a01b5d8e567"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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