CVE-2026-97604 (GCVE-0-2026-97604)
Vulnerability from cvelistv5
Published
2026-09-25 10:22
Modified
2026-10-19 09:10
Severity ?
Summary
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. 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) 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a
Version: 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a
Version: 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a
Version: 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a
Version: 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a
Version: 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a
Version: 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a
Version: 5e266e2e0e19532c1b8e2e2bff1eb6ccf42e478a
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/vfb.c"
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "2.6.30"
            },
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              "lessThan": "2.6.30",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
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            },
            {
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              "status": "unaffected",
              "version": "5.15.222",
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            },
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
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              "version": "7.2.7",
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            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\u003ecmap and performs the\nusercopy after dropping info-\u003elock. 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\u0027s\ncleanup into an fb_destroy callback so its colormap and screen buffer stay\nalive until all file references have been released."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:10:08.190Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bf49eac7ed11aabd0b9b790c062742a8e4be97c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/040ce3950f64a11e9ee5646c8aaa91fd2e29e245"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab664e279eb2a68e55895dd115a9488807280f07"
        },
        {
          "url": "https://git.kernel.org/stable/c/de5a0eda59fe4b3eacd1a67c992e54766bb6683f"
        },
        {
          "url": "https://git.kernel.org/stable/c/86356f13598f59f5acb1754895747dcdaf65a254"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ff1effb047e465cde193d7df95988aa1520035e"
        },
        {
          "url": "https://git.kernel.org/stable/c/3c91e51a53cf805e551e5dc8149cd0539a6dbb9d"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0a34a40ed299c9c7cff6af163a5b883ee9d6d73"
        }
      ],
      "title": "fbdev: vfb: defer cleanup until the last reference",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97604",
    "datePublished": "2026-09-25T10:22:16.613Z",
    "dateReserved": "2026-09-24T16:01:01.158Z",
    "dateUpdated": "2026-10-19T09:10:08.190Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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