{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "b5f545c880a2a47947ba2118b2509644ab7a2969"
            },
            {
              "fixed": "d8274181b0f28d450b42489723a5ba81042158d7"
            },
            {
              "fixed": "4982bfabce6b33b3c9eddb4fb900fe5568b7cf91"
            },
            {
              "fixed": "708709c65a1832a99b0eef8ae46e343ddaca3d06"
            },
            {
              "fixed": "35ab4db86774d82389e4b9559e26ab7f68d8e395"
            },
            {
              "fixed": "f9b68632ac93cc742f2e411021c4dbfe452ea0c2"
            },
            {
              "fixed": "7216ce8cb12fee44e309503955bb83806b106129"
            },
            {
              "fixed": "83c0a1cb296d955d5f4d1f0bd8a769ba8ed8c29f"
            },
            {
              "fixed": "fd15b457a86939c38aa12116adabd8ff686c5e51"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.16"
            },
            {
              "fixed": "5.10.260"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.211"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.177"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.144"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.95"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.38"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63823.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: Pin request_key_auth payload in instantiate paths\n\nA: request_key()       B: KEYCTL_INSTANTIATE_IOV\n================       =========================\n\ncreate auth key\nstore rka in auth key\nwait for helper\n                       get auth key\n                       load rka from auth key\n                       copy user payload\n                       sleep on #PF\n\nhelper completed\ndetach and free rka\ndestroy auth key\n                       wake up\n                       use rka-\u003etarget_key\n                       **USE-AFTER-FREE**\n\nGive request_key_auth payloads a refcount.  Take a payload reference while\nauthkey-\u003esem stabilizes the payload and revocation state.  Hold that\nreference across the instantiate and reject paths.  Drop the auth key\nowning reference from revoke and destroy.\n\n[jarkko: Replaced the first two paragraphs of text with an actual\n concurrency scenario.]",
  "id": "CVE-2026-63823",
  "modified": "2026-07-22T05:29:39.915526560Z",
  "published": "2026-07-19T12:02:19.847Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35ab4db86774d82389e4b9559e26ab7f68d8e395"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4982bfabce6b33b3c9eddb4fb900fe5568b7cf91"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/708709c65a1832a99b0eef8ae46e343ddaca3d06"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7216ce8cb12fee44e309503955bb83806b106129"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83c0a1cb296d955d5f4d1f0bd8a769ba8ed8c29f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d8274181b0f28d450b42489723a5ba81042158d7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9b68632ac93cc742f2e411021c4dbfe452ea0c2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fd15b457a86939c38aa12116adabd8ff686c5e51"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63823.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63823"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "keys: Pin request_key_auth payload in instantiate paths"
}