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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.266",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.266",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
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                {
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usx2y: bound the hwdep mmap fault offset\n\nsnd_us428ctls_vm_fault() turns the faulting page offset into a kernel\naddress with no bound of any kind:\n\n\toffset = vmf-\u003epgoff \u003c\u003c PAGE_SHIFT;\n\tvaddr = (char *)(...)-\u003eus428ctls_sharedmem + offset;\n\tpage = virt_to_page(vaddr);\n\tget_page(page);\n\tvmf-\u003epage = page;\n\n\treturn 0;\n\nsnd_us428ctls_mmap() checks only the length of the mapping, never the\noffset, and us428ctls_sharedmem is a single page from\nalloc_pages_exact().  For a character device file_mmap_size_max()\nreturns ULONG_MAX, so the mm layer imposes no ceiling either.  Every page\noffset above zero resolves to a struct page outside the object, and the\nhandler installs it into the caller\u0027s address space read-write; the vma\nis not marked read-only.\n\nThe caller picks the page frame with a single mmap() argument and gets\nread-write access to a page of kernel memory it does not own; an offset\nthat lands in an unpopulated vmemmap region oopses instead.\n\nA process that can open the hwdep node of an attached US-X2Y reaches\nthis after loading the FPGA image through the same node; no capability\ncheck is involved.\n\nOn 7.2.0-rc5 (arm64), mmap() with a large offset:\n\n  Unable to handle kernel paging request at virtual address fffffdffc45d5ac8\n  pc : snd_us428ctls_vm_fault+0x68/0x140 [snd_usb_usx2y]\n  Call trace:\n   snd_us428ctls_vm_fault+0x68/0x140 [snd_usb_usx2y]\n   __do_fault\n   __handle_mm_fault\n   handle_mm_fault\n   el0_da\n\nReject any offset outside the shared region.  The pcm hwdep handler in\nusx2yhwdeppcm.c computes its address the same way and needs the same\nbound.\n\nDiscovered by XBOW, triaged by Baul Lee \u003cbaul.lee@xbow.com\u003e"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires local mmap() on the ALSA hwdep character device (/dev/snd/hwC*D*); the path is open\u2192SNDRV_HWDEP_IOCTL_DSP_LOAD\u2192mmap\u2192snd_us428ctls_vm_fault, with no network or remote packet handler involved.\nAC:L - The attacker fully controls the mmap() page offset (vmf-\u003epgoff); any offset beyond the single-page shared buffer deterministically maps an attacker-chosen kernel page read-write or oopses, with no race or uncontrollable memory-layout dependency.\nPR:L - The driver performs no capability checks on hwdep open, ioctl, or mmap; any unprivileged local user who can access the hwdep node (typically via the audio group on desktop distros) can reach the fault handler after loading the FPGA image.\nUI:N - All exploitation steps\u2014opening the hwdep node, loading FPGA firmware via DSP_LOAD ioctl, and mmap with a crafted offset\u2014are performed by the attacker; no discretionary victim action beyond the device being present in the environment is required.\nS:U - Impact is arbitrary read/write of host kernel memory leading to local privilege escalation within the same kernel security authority; it does not cross a VM, container, or IOMMU security boundary.\nC:H - Unbounded pgoff arithmetic maps arbitrary kernel struct pages into the attacker\u0027s address space; the VMA is not read-only, giving attacker-controlled read access to any reachable kernel page selected via the mmap offset.\nI:H - The same unbounded mmap fault path installs attacker-chosen kernel pages into a read-write userspace mapping, enabling arbitrary kernel memory writes and heap corruption primitives suitable for privilege escalation or code execution.\nA:H - Large mmap offsets dereference unpopulated vmemmap regions causing kernel paging faults and oops (demonstrated on arm64); arbitrary kernel page writes can also panic the system or destabilize the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:41:03.118Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ad6fedea65c6e90eda00d716c8bf20cdc437ed10"
        },
        {
          "url": "https://git.kernel.org/stable/c/10a87401fb3148c388e55df0148295b3b137da07"
        },
        {
          "url": "https://git.kernel.org/stable/c/34ab56ed854baa73a731cfd99af689f0b1bac444"
        },
        {
          "url": "https://git.kernel.org/stable/c/4208db2453e1ea71b8048a5b7802360cb29a53f1"
        },
        {
          "url": "https://git.kernel.org/stable/c/f613b4a2d87247b51a1b2b330f2e083a454125f2"
        },
        {
          "url": "https://git.kernel.org/stable/c/f75d6f61f0d9c5c1ea725104014e10d26d1e3a00"
        },
        {
          "url": "https://git.kernel.org/stable/c/5bf5ccddf00b59f1e3ea7e65d76a5f5b5c21cc2e"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ca1eea3cd17930daffe9e429a7c89232036ec24"
        }
      ],
      "title": "ALSA: usx2y: bound the hwdep mmap fault offset",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74641",
    "datePublished": "2026-08-22T15:32:19.696Z",
    "dateReserved": "2026-08-15T05:44:03.922Z",
    "dateUpdated": "2026-10-16T19:06:04.565Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}