{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e0a384434ae1bdfb03954c46c464e3dbd3223ad6"
            },
            {
              "fixed": "b7459fddcb27a4b7d01067678172afa362cf660d"
            },
            {
              "fixed": "1d653a183973f5283a3db5a38cd5e195eb152244"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.1.0"
            },
            {
              "fixed": "7.2.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98540.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfprobe: Terminate the fgraph_data list when the reservation is not filled\n\nfprobe_fgraph_entry() reserves shadow stack space for every fprobe with\nan exit handler, but only fills it for those whose entry handler returns\n0. fgraph_reserve_data() does not clear the area, so fprobe_return()\nparses the unused tail as headers left over from an earlier call, and an\nexit handler can run twice or despite its entry handler asking to skip\nit.\n\nWrite a zero word after the last entry to terminate the walk. A zeroed\nslot does not decode to a NULL fprobe on the arches that encode the\nheader into one unsigned long, since arch_decode_fprobe_header_fp() ORs\nin FPROBE_HEADER_MSB_PATTERN, so make read_fprobe_header() return NULL\nfor a zeroed slot.",
  "id": "CVE-2026-98540",
  "modified": "2026-10-20T02:30:52.213823884Z",
  "published": "2026-10-18T15:18:08.352Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1d653a183973f5283a3db5a38cd5e195eb152244"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b7459fddcb27a4b7d01067678172afa362cf660d"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98540.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98540"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "fprobe: Terminate the fgraph_data list when the reservation is not filled"
}