{
  "cveId": "CVE-2026-68099",
  "url": "https://patchblox.com/security/cve/CVE-2026-68099",
  "summary": "CVE-2026-68099 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-68099, released August 11, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "ksmbd: restore DACL size on check_add_overflow() to avoid malformed ACL",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ksmbd: restore DACL size on check_add_overflow() to avoid malformed ACL  check_add_overflow() unconditionally writes the truncated sum into *d even on overflow, per its contract in include/linux/overflow.h. The four check_add_overflow() guards in set_posix_acl_entries_dacl() and set_ntacl_dacl() break out of the ACE-building loops on overflow, but the truncated *size is then consumed downstream at the end of set_ntacl_dacl():      pndacl-\u003Esize = cpu_to_le16(le16_to_cpu(pndacl-\u003Esize) \u002B size);  This produces an on-wire NT ACL whose pndacl-\u003Esize under-reports the bytes actually written by the preceding fill_ace_for_sid()/memcpy() calls, yielding a malformed ACL that can trigger out-of-bounds reads when re-parsed by clients or ksmbd itself.  Restore *size to its pre-addition value on each overflow branch (via \u0060*size -= ace_sz\u0060 / \u0060size -= nt_ace_size\u0060) so that after the break, *size once again holds the cumulative size of the successfully-written ACEs. The committed ACL is then truncated-but-self-consistent rather than malformed.  The ksmbd DACL builders are the only check_add_overflow() sites found where an overflow path breaks out of a loop and the destination value is consumed afterward. The other nearby break-style cases either return -EINVAL on overflow (transport_ipc.c) or break without consuming the overflowed destination value afterward (buildid.c).",
  "published": "2026-08-10T13:19:54Z",
  "severity": "Moderate",
  "cvss": 4.3,
  "epss": 0.00173,
  "epssPercentile": 0.06727,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68099",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.187-1",
      "fix": "DEBIAN-CVE-2026-68099",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-68099",
      "released": "2026-08-11T16:03:09Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.101-1",
      "fix": "DEBIAN-CVE-2026-68099",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-68099",
      "released": "2026-08-11T16:03:09Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.6-1",
      "fix": "DEBIAN-CVE-2026-68099",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-68099",
      "released": "2026-08-11T16:03:09Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.101-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-68099",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-68099",
      "released": "2026-08-11T16:03:09Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}