FKIE_CVE-2026-74641

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-10-14 13:10
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: usx2y: bound the hwdep mmap fault offset snd_us428ctls_vm_fault() turns the faulting page offset into a kernel address with no bound of any kind: offset = vmf->pgoff << PAGE_SHIFT; vaddr = (char *)(...)->us428ctls_sharedmem + offset; page = virt_to_page(vaddr); get_page(page); vmf->page = page; return 0; snd_us428ctls_mmap() checks only the length of the mapping, never the offset, and us428ctls_sharedmem is a single page from alloc_pages_exact(). For a character device file_mmap_size_max() returns ULONG_MAX, so the mm layer imposes no ceiling either. Every page offset above zero resolves to a struct page outside the object, and the handler installs it into the caller's address space read-write; the vma is not marked read-only. The caller picks the page frame with a single mmap() argument and gets read-write access to a page of kernel memory it does not own; an offset that lands in an unpopulated vmemmap region oopses instead. A process that can open the hwdep node of an attached US-X2Y reaches this after loading the FPGA image through the same node; no capability check is involved. On 7.2.0-rc5 (arm64), mmap() with a large offset: Unable to handle kernel paging request at virtual address fffffdffc45d5ac8 pc : snd_us428ctls_vm_fault+0x68/0x140 [snd_usb_usx2y] Call trace: snd_us428ctls_vm_fault+0x68/0x140 [snd_usb_usx2y] __do_fault __handle_mm_fault handle_mm_fault el0_da Reject any offset outside the shared region. The pcm hwdep handler in usx2yhwdeppcm.c computes its address the same way and needs the same bound. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/10a87401fb3148c388e55df0148295b3b137da07
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2ca1eea3cd17930daffe9e429a7c89232036ec24
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/34ab56ed854baa73a731cfd99af689f0b1bac444
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4208db2453e1ea71b8048a5b7802360cb29a53f1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5bf5ccddf00b59f1e3ea7e65d76a5f5b5c21cc2e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ad6fedea65c6e90eda00d716c8bf20cdc437ed10
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f613b4a2d87247b51a1b2b330f2e083a454125f2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f75d6f61f0d9c5c1ea725104014e10d26d1e3a00
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/usx2y/usX2Yhwdep.c",
            "sound/usb/usx2y/usx2yhwdeppcm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ad6fedea65c6e90eda00d716c8bf20cdc437ed10",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "10a87401fb3148c388e55df0148295b3b137da07",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "34ab56ed854baa73a731cfd99af689f0b1bac444",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "4208db2453e1ea71b8048a5b7802360cb29a53f1",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "f613b4a2d87247b51a1b2b330f2e083a454125f2",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "f75d6f61f0d9c5c1ea725104014e10d26d1e3a00",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "5bf5ccddf00b59f1e3ea7e65d76a5f5b5c21cc2e",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "2ca1eea3cd17930daffe9e429a7c89232036ec24",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/usx2y/usX2Yhwdep.c",
            "sound/usb/usx2y/usx2yhwdeppcm.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": "5.10.266",
              "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"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nALSA: usx2y: acotado el desplazamiento de fallo de mmap de hwdep\n\nsnd_us428ctls_vm_fault() convierte el desplazamiento de p\u00e1gina que causa el fallo en una direcci\u00f3n de kernel sin ning\u00fan tipo de l\u00edmite:\n\n\toffset = vmf -\u003e pgoff \u003c\u003c PAGE_SHIFT;\n\tvaddr = (char *)(...) -\u003e us428ctls_sharedmem + offset;\n\tpage = virt_to_page(vaddr);\n\tget_page(page);\n\tvmf -\u003e page = page;\n\n\treturn 0;\n\nsnd_us428ctls_mmap() comprueba solo la longitud del mapeo, nunca el desplazamiento, y us428ctls_sharedmem es una sola p\u00e1gina de alloc_pages_exact(). Para un dispositivo de caracteres, file_mmap_size_max() devuelve ULONG_MAX, por lo que la capa mm tampoco impone ning\u00fan l\u00edmite superior. Cada desplazamiento de p\u00e1gina superior a cero se resuelve en una struct page fuera del objeto, y el gestor lo instala en el espacio de direcciones del llamador con permisos de lectura-escritura; el vma no est\u00e1 marcado como de solo lectura.\n\nEl llamador selecciona el marco de p\u00e1gina con un \u00fanico argumento de mmap() y obtiene acceso de lectura-escritura a una p\u00e1gina de memoria del kernel que no le pertenece; un desplazamiento que cae en una regi\u00f3n vmemmap no poblada causa un \u0027oops\u0027 en su lugar.\n\nUn proceso que puede abrir el nodo hwdep de un US-X2Y conectado alcanza esto despu\u00e9s de cargar la imagen FPGA a trav\u00e9s del mismo nodo; no se realiza ninguna comprobaci\u00f3n de capacidad.\n\nEn 7.2.0-rc5 (arm64), mmap() con un desplazamiento grande:\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\nRechazar cualquier desplazamiento fuera de la regi\u00f3n compartida. El gestor hwdep de pcm en usx2yhwdeppcm.c calcula su direcci\u00f3n de la misma manera y necesita el mismo l\u00edmite.\n\nDescubierto por XBOW, analizado por Baul Lee \u003cbaul.lee@xbow.com\u003e"
    }
  ],
  "id": "CVE-2026-74641",
  "lastModified": "2026-10-14T13:10:00.187",
  "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",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-22T16:16:37.383",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/10a87401fb3148c388e55df0148295b3b137da07"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2ca1eea3cd17930daffe9e429a7c89232036ec24"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/34ab56ed854baa73a731cfd99af689f0b1bac444"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4208db2453e1ea71b8048a5b7802360cb29a53f1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5bf5ccddf00b59f1e3ea7e65d76a5f5b5c21cc2e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ad6fedea65c6e90eda00d716c8bf20cdc437ed10"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f613b4a2d87247b51a1b2b330f2e083a454125f2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f75d6f61f0d9c5c1ea725104014e10d26d1e3a00"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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