{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c"
            },
            {
              "fixed": "0d36653a3a821e5a974798adb347b3ea09332914"
            },
            {
              "fixed": "25d500cf391e384356a612b85cf60b353ad3cd0c"
            },
            {
              "fixed": "07ceb444c8f627cf863864d4274b5a77769725ed"
            },
            {
              "fixed": "cb8092038e95dc1113a68e63762de40fff61ba71"
            },
            {
              "fixed": "582fbecb3756330006fe1950762412a68c2cacd2"
            },
            {
              "fixed": "09e9206008b887aa553733bd915d73131071a086"
            },
            {
              "fixed": "2eeae47a438694408189138048a786be99954032"
            },
            {
              "fixed": "7e5aedf6059cba2a669d86caeaf5a51f33ec85a1"
            },
            {
              "fixed": "8bd29dbe03fc5b0f039ab2395ff37b64236d2f0c"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.14.0"
            },
            {
              "fixed": "5.10.258"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.209"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.136"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.83"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.24"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.14"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.20.0"
            },
            {
              "fixed": "7.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31578.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: as102: fix to not free memory after the device is registered in as102_usb_probe()\n\nIn as102_usb driver, the following race condition occurs:\n```\n\t\tCPU0\t\t\t\t\t\tCPU1\nas102_usb_probe()\n  kzalloc(); // alloc as102_dev_t\n  ....\n  usb_register_dev();\n\t\t\t\t\t\tfd = sys_open(\"/path/to/dev\"); // open as102 fd\n\t\t\t\t\t\t....\n  usb_deregister_dev();\n  ....\n  kfree(); // free as102_dev_t\n  ....\n\t\t\t\t\t\tsys_close(fd);\n\t\t\t\t\t\t  as102_release() // UAF!!\n\t\t\t\t\t\t    as102_usb_release()\n\t\t\t\t\t\t      kfree(); // DFB!!\n```\n\nWhen a USB character device registered with usb_register_dev() is later\nunregistered (via usb_deregister_dev() or disconnect), the device node is\nremoved so new open() calls fail. However, file descriptors that are\nalready open do not go away immediately: they remain valid until the last\nreference is dropped and the driver's .release() is invoked.\n\nIn as102, as102_usb_probe() calls usb_register_dev() and then, on an\nerror path, does usb_deregister_dev() and frees as102_dev_t right away.\nIf userspace raced a successful open() before the deregistration, that\nopen FD will later hit as102_release() --\u003e as102_usb_release() and access\nor free as102_dev_t again, occur a race to use-after-free and\ndouble-free vuln.\n\nThe fix is to never kfree(as102_dev_t) directly once usb_register_dev()\nhas succeeded. After deregistration, defer freeing memory to .release().\n\nIn other words, let release() perform the last kfree when the final open\nFD is closed.",
  "id": "CVE-2026-31578",
  "modified": "2026-08-12T03:51:30.230373772Z",
  "published": "2026-04-24T14:42:09.519Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07ceb444c8f627cf863864d4274b5a77769725ed"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/09e9206008b887aa553733bd915d73131071a086"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d36653a3a821e5a974798adb347b3ea09332914"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/25d500cf391e384356a612b85cf60b353ad3cd0c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2eeae47a438694408189138048a786be99954032"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/582fbecb3756330006fe1950762412a68c2cacd2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e5aedf6059cba2a669d86caeaf5a51f33ec85a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8bd29dbe03fc5b0f039ab2395ff37b64236d2f0c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cb8092038e95dc1113a68e63762de40fff61ba71"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31578.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31578"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "media: as102: fix to not free memory after the device is registered in as102_usb_probe()"
}