{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-99112",
  "modified": "2026-10-29T05:30:01Z",
  "upstream": [
    "CVE-2026-99112"
  ],
  "published": "2026-10-28T11:36:32Z",
  "summary": "net/sched: cls_flower: validate mask pointer after nla_next()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_flower: validate mask pointer after nla_next()\n\nfl_set_enc_opt() iterates the key's nested tunnel-option attributes\nwith nla_for_each_attr() while advancing a single mask pointer via\nnla_next() at the bottom of each loop, so the mask cursor is driven\nby the number of key attributes rather than by the mask's own\nattributes.  The nla_ok() added by commit c96adff956191 (\"cls_flower:\ncall nla_ok() before nla_next()\") only validates the mask pointer\nthat was just consumed; the pointer produced by nla_next() is used by\nthe next iteration (fl_set_geneve_opt() and siblings) without any\nvalidation.\n\nThe mask's nested attributes are validated with NL_VALIDATE_LIBERAL,\nwhich merely warns on trailing bytes that do not form a complete\nattribute.  A mask carrying one valid attribute plus 1-3 residue\nbytes (or a non-aligned attribute length making msk_depth negative)\ntherefore reaches the next iteration with msk_depth != 0, so neither\nthe !msk_depth check in fl_set_enc_opt() nor the !depth check in the\nper-type helpers fires.  nla_type() then reads past the mask payload\nand nla_parse_nested_deprecated() iterates with an nla_len taken\nfrom those bytes, reading well beyond the mask attribute (KASAN:\nslab-out-of-bounds read in __nla_validate_parse from fl_change()).\n\nValidate the advanced mask pointer as well: when the mask is not\nlegitimately exhausted (msk_depth != 0) and the new pointer fails\nnla_ok(), reject the filter with -EINVAL.  An exactly exhausted mask\nstill skips the check, preserving exact-match behaviour for the\nremaining key attributes.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-99112"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/45e60747a9db2307929260d9aa9c1c6cbb70ee77"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bb187146c7e5c666874784e4f3fc1bc5126e6e92"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fee10655709c5c597e8e9f722f3035d9ea31ff3a"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-28T11:36:32Z"
  }
}