CVE-2026-97989

Estado: RecibidaSin puntuar—

In the Linux kernel, the following vulnerability has been resolved:

vduse: validate virtqueue alignment

vduse_validate_config() only checks the upper bound of vq_align. Invalid values can therefore reach vring_create_virtqueue_map(). The split-ring helpers use align - 1 as a bit mask, so the alignment must be a non-zero power of two. A zero value makes vring_size() drop the descriptor and available-ring part and vring_init() leave the used ring pointer NULL.

The VIRTIO spec requires the used ring to start at an address aligned to at least 4 bytes. Reject values below VRING_USED_ALIGN_SIZE as well as non-power-of-two values before they reach the virtio ring helpers.

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Opening a virtio-net device created with vq_align=0 triggered:

Validate the value before it reaches the virtio ring helpers.

Detalles técnicos trazas, registros y código del informe original

BUG: KASAN: null-ptr-deref in virtqueue_kick_prepare_split+0xe3/0x100
Read of size 2 at addr 0000000000000000 by task systemd-network/1062

Call Trace (relevant frames):
 dump_stack_lvl
 print_report
 kasan_report
 __asan_load2
 virtqueue_kick_prepare_split+0xe3/0x100
 virtqueue_kick_prepare+0x40/0x60
 try_fill_recv+0x857/0x1250
 virtnet_open+0x189/0x460
 __dev_open+0x225/0x390
 __dev_change_flags+0x368/0x3b0
 netif_change_flags+0x56/0xc0
 do_setlink.isra.0+0x68c/0x1e30

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.15%
Percentil entre todas las CVEs puntuadas: 4
Fecha de la puntuación: 6/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux Kernel^AI

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-97989",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "c8a6153b6c59d95c0e091f053f6f180952ade91e",
              "lessThan": "c3c3b0839a1197530cc18f535062fc84dbdfc885",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c8a6153b6c59d95c0e091f053f6f180952ade91e",
              "lessThan": "fa2c25b4add57888acfa89e398389e267bff3dcf",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/vdpa/vdpa_user/vduse_dev.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.15",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/vdpa/vdpa_user/vduse_dev.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-25T11:17:27.010",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/c3c3b0839a1197530cc18f535062fc84dbdfc885",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fa2c25b4add57888acfa89e398389e267bff3dcf",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvduse: validate virtqueue alignment\n\nvduse_validate_config() only checks the upper bound of vq_align. Invalid\nvalues can therefore reach vring_create_virtqueue_map(). The split-ring\nhelpers use align - 1 as a bit mask, so the alignment must be a non-zero\npower of two. A zero value makes vring_size() drop the descriptor and\navailable-ring part and vring_init() leave the used ring pointer NULL.\n\nThe VIRTIO spec requires the used ring to start at an address\naligned to at least 4 bytes. Reject values below VRING_USED_ALIGN_SIZE as\nwell as non-power-of-two values before they reach the virtio ring helpers.\n\nOpening a virtio-net device created with vq_align=0 triggered:\n\nBUG: KASAN: null-ptr-deref in virtqueue_kick_prepare_split+0xe3/0x100\nRead of size 2 at addr 0000000000000000 by task systemd-network/1062\n\nCall Trace (relevant frames):\n dump_stack_lvl\n print_report\n kasan_report\n __asan_load2\n virtqueue_kick_prepare_split+0xe3/0x100\n virtqueue_kick_prepare+0x40/0x60\n try_fill_recv+0x857/0x1250\n virtnet_open+0x189/0x460\n __dev_open+0x225/0x390\n __dev_change_flags+0x368/0x3b0\n netif_change_flags+0x56/0xc0\n do_setlink.isra.0+0x68c/0x1e30\n\nValidate the value before it reaches the virtio ring helpers."
    }
  ],
  "lastModified": "2026-09-25T11:17:27.010",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}