{
  "cveId": "CVE-2026-64439",
  "url": "https://patchblox.com/security/cve/CVE-2026-64439",
  "summary": "CVE-2026-64439 is fixed in linux on 1 platform by DEBIAN-CVE-2026-64439 (version 7.1.4-1), released August 7, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  crypto: krb5 - filter out async aead implementat...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  crypto: krb5 - filter out async aead implementations at alloc  krb5_aead_encrypt(), krb5_aead_decrypt() in rfc3961_simplified.c and rfc8009_encrypt(), rfc8009_decrypt() in rfc8009_aes2.c set a NULL completion callback and treat any negative return from crypto_aead_{encrypt,decrypt}() as terminal, falling through to kfree_sensitive(buffer).  When the encrypt_name resolves to an async AEAD instance the request returns -EINPROGRESS, the buffer is freed while the backend\u0027s worker still holds a pointer, and the worker dereferences the freed slab on completion.  KASAN report under UML\u002BSLUB with a synthetic async aead backend bound to krb5-\u003Eencrypt_name:    BUG: KASAN: slab-use-after-free in t5_stub_complete\u002B0x7d/0xc7  The helpers were written synchronously, so filter the async instances out at allocation time instead of plumbing crypto_wait_req() through every call site.  Reachable via net/rxrpc/rxgk.c, fs/afs/cm_security.c and net/ceph/crypto.c on systems with an async AEAD provider bound to the krb5 enctype name.",
  "published": "2026-07-25T10:17:28Z",
  "severity": "critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.0043,
  "epssPercentile": 0.37446,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.4-1",
      "fix": "DEBIAN-CVE-2026-64439",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-64439",
      "released": "2026-08-07T15:22:10Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}