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CVE-2026-80827 (GCVE-0-2026-80827)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:54 – Updated: 2026-09-04 15:54
VLAI
Title
USB: serial: option: fix slab OOB read in interrupt URB callback
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 ]
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 58cfe9113e485f7e04bd0eac4fc4251b330af501 , < fbe60fd2abc8a5561f39719a41ad9a01b5d8e567 (git)
Affected: 58cfe9113e485f7e04bd0eac4fc4251b330af501 , < 94e5525697b9e91ddc4071129874120a50a4f342 (git)
Affected: 58cfe9113e485f7e04bd0eac4fc4251b330af501 , < 6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec (git)
Affected: 58cfe9113e485f7e04bd0eac4fc4251b330af501 , < 030e3a73d3c3aa67c44454649e984d6383cdb7d3 (git)
Affected: 58cfe9113e485f7e04bd0eac4fc4251b330af501 , < 060db7d48af1e650643c8b8319111a9ea2ce4486 (git)
Affected: 58cfe9113e485f7e04bd0eac4fc4251b330af501 , < 2ef5560387f2c0713cee975be2b24b281bd90f3e (git)
Affected: 58cfe9113e485f7e04bd0eac4fc4251b330af501 , < a72a13c83a652516a0e469d275b81d29a7429049 (git)
Affected: 58cfe9113e485f7e04bd0eac4fc4251b330af501 , < d762aef4eba354066be21a5d88eb2066e282f4c9 (git)
Affected: 58cfe9113e485f7e04bd0eac4fc4251b330af501 , < 885d802f544ca7bfa8f3984d94233cce715bb6b3 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.269 , ≤ 5.10.* (semver)
Unaffected: 5.15.220 , ≤ 5.15.* (semver)
Unaffected: 6.1.187 , ≤ 6.1.* (semver)
Unaffected: 6.6.156 , ≤ 6.6.* (semver)
Unaffected: 6.12.108 , ≤ 6.12.* (semver)
Unaffected: 6.18.49 , ≤ 6.18.* (semver)
Unaffected: 7.1.13 , ≤ 7.1.* (semver)
Unaffected: 7.2.3 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "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 ]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:54:31.111Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/fbe60fd2abc8a5561f39719a41ad9a01b5d8e567"
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          "url": "https://git.kernel.org/stable/c/94e5525697b9e91ddc4071129874120a50a4f342"
        },
        {
          "url": "https://git.kernel.org/stable/c/6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec"
        },
        {
          "url": "https://git.kernel.org/stable/c/030e3a73d3c3aa67c44454649e984d6383cdb7d3"
        },
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          "url": "https://git.kernel.org/stable/c/060db7d48af1e650643c8b8319111a9ea2ce4486"
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          "url": "https://git.kernel.org/stable/c/2ef5560387f2c0713cee975be2b24b281bd90f3e"
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        },
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          "url": "https://git.kernel.org/stable/c/d762aef4eba354066be21a5d88eb2066e282f4c9"
        },
        {
          "url": "https://git.kernel.org/stable/c/885d802f544ca7bfa8f3984d94233cce715bb6b3"
        }
      ],
      "title": "USB: serial: option: fix slab OOB read in interrupt URB callback",
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    "datePublished": "2026-09-04T15:54:31.111Z",
    "dateReserved": "2026-08-26T14:34:25.795Z",
    "dateUpdated": "2026-09-04T15:54:31.111Z",
    "state": "PUBLISHED"
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      "date": "2026-09-14",
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      "cve": "CVE-2026-80827",
      "id": "msrc_CVE-2026-80827",
      "initial_release_date": "2026-09-07T01:56:31.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "USB: serial: option: fix slab OOB read in interrupt URB callback",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80827.json",
      "version": "1"
    },
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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 ]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/serial/option.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\"lessThan\":\"fbe60fd2abc8a5561f39719a41ad9a01b5d8e567\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\"lessThan\":\"94e5525697b9e91ddc4071129874120a50a4f342\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\"lessThan\":\"6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\"lessThan\":\"030e3a73d3c3aa67c44454649e984d6383cdb7d3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\"lessThan\":\"060db7d48af1e650643c8b8319111a9ea2ce4486\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\"lessThan\":\"2ef5560387f2c0713cee975be2b24b281bd90f3e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\"lessThan\":\"a72a13c83a652516a0e469d275b81d29a7429049\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\"lessThan\":\"d762aef4eba354066be21a5d88eb2066e282f4c9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\"lessThan\":\"885d802f544ca7bfa8f3984d94233cce715bb6b3\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/serial/option.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.269\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.220\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.187\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.156\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.108\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.49\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.13\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.3\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-08T17:16:43Z",
      "cve": "CVE-2026-80827",
      "id": "CVE-2026-80827",
      "initial_release_date": "2026-09-05T00:26:41Z",
      "product_status:known_affected": "269",
      "product_status:known_not_affected": "84",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80827",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80827.json",
      "version": "3"
    }
  }
}



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