« Volver al listado

CVE-2026-97604

Estado: RecibidaSin puntuar—

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

fbdev: vfb: defer cleanup until the last reference

FBIOGETCMAP takes a shallow snapshot of info->cmap and performs the usercopy after dropping info->lock. vfb_remove() frees the colormap immediately after unregistering the framebuffer, even when an open file still holds a reference to fb_info. A concurrent driver unbind can therefore free the colormap while the ioctl copies it to userspace.

unregister_framebuffer() drops the registration reference, and fbdev calls fb_destroy after the last put_fb_info(). Move the registered framebuffer's cleanup into an fb_destroy callback so its colormap and screen buffer stay alive until all file references have been released.

Detalles técnicos trazas, registros y código del informe original
KASAN reports:

  BUG: KASAN: slab-use-after-free in _copy_to_user
  Read of size 512 by task poc/125

   _copy_to_user (./include/linux/instrumented.h:129 ./include/linux/uaccess.h:201 lib/usercopy.c:24)
   fb_cmap_to_user (./include/linux/uaccess.h:230 drivers/video/fbdev/core/fbcmap.c:211)
   do_fb_ioctl (drivers/video/fbdev/core/fb_chrdev.c:114)

   Allocated by task 1:
   fb_alloc_cmap_gfp (./include/linux/slab.h:973 ./include/linux/slab.h:1290 drivers/video/fbdev/core/fbcmap.c:108)
   vfb_probe (drivers/video/fbdev/vfb.c:459)

   Freed by task 124:
   fb_dealloc_cmap (drivers/video/fbdev/core/fbcmap.c:151)
   vfb_remove (drivers/video/fbdev/vfb.c:489)

CVSS

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

Probabilidad de explotación (EPSS)

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 KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-97604",
  "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": "5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a",
              "lessThan": "bf49eac7ed11aabd0b9b790c062742a8e4be97c6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a",
              "lessThan": "040ce3950f64a11e9ee5646c8aaa91fd2e29e245",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a",
              "lessThan": "ab664e279eb2a68e55895dd115a9488807280f07",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a",
              "lessThan": "de5a0eda59fe4b3eacd1a67c992e54766bb6683f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a",
              "lessThan": "86356f13598f59f5acb1754895747dcdaf65a254",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a",
              "lessThan": "5ff1effb047e465cde193d7df95988aa1520035e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a",
              "lessThan": "3c91e51a53cf805e551e5dc8149cd0539a6dbb9d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a",
              "lessThan": "a0a34a40ed299c9c7cff6af163a5b883ee9d6d73",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/video/fbdev/vfb.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.30"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.30",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "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/video/fbdev/vfb.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-25T11:17:14.407",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/040ce3950f64a11e9ee5646c8aaa91fd2e29e245",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3c91e51a53cf805e551e5dc8149cd0539a6dbb9d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5ff1effb047e465cde193d7df95988aa1520035e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/86356f13598f59f5acb1754895747dcdaf65a254",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a0a34a40ed299c9c7cff6af163a5b883ee9d6d73",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ab664e279eb2a68e55895dd115a9488807280f07",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bf49eac7ed11aabd0b9b790c062742a8e4be97c6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/de5a0eda59fe4b3eacd1a67c992e54766bb6683f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: vfb: defer cleanup until the last reference\n\nFBIOGETCMAP takes a shallow snapshot of info->cmap and performs the\nusercopy after dropping info->lock. vfb_remove() frees the colormap\nimmediately after unregistering the framebuffer, even when an open file\nstill holds a reference to fb_info. A concurrent driver unbind can\ntherefore free the colormap while the ioctl copies it to userspace.\n\nKASAN reports:\n\n  BUG: KASAN: slab-use-after-free in _copy_to_user\n  Read of size 512 by task poc/125\n\n   _copy_to_user (./include/linux/instrumented.h:129 ./include/linux/uaccess.h:201 lib/usercopy.c:24)\n   fb_cmap_to_user (./include/linux/uaccess.h:230 drivers/video/fbdev/core/fbcmap.c:211)\n   do_fb_ioctl (drivers/video/fbdev/core/fb_chrdev.c:114)\n\n   Allocated by task 1:\n   fb_alloc_cmap_gfp (./include/linux/slab.h:973 ./include/linux/slab.h:1290 drivers/video/fbdev/core/fbcmap.c:108)\n   vfb_probe (drivers/video/fbdev/vfb.c:459)\n\n   Freed by task 124:\n   fb_dealloc_cmap (drivers/video/fbdev/core/fbcmap.c:151)\n   vfb_remove (drivers/video/fbdev/vfb.c:489)\n\nunregister_framebuffer() drops the registration reference, and fbdev calls\nfb_destroy after the last put_fb_info(). Move the registered framebuffer's\ncleanup into an fb_destroy callback so its colormap and screen buffer stay\nalive until all file references have been released."
    }
  ],
  "lastModified": "2026-10-03T11:18:06.977",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}