{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e17d43b93e544f5016c0251d2074c15568d5d963"
            },
            {
              "fixed": "8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7"
            },
            {
              "fixed": "e506333d1b9f42f1e402acebf1283af3c44a3809"
            },
            {
              "fixed": "677d0b51ac1a0db55d768c4c6399210b3de0795b"
            },
            {
              "fixed": "357e8a77a501d96c9517f01f4a211eed5e9c9184"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.9.0"
            },
            {
              "fixed": "6.12.113"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.56"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98655.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Require kernel access for text poke events\n\nPerf events with exclude_kernel=1 can be opened without kernel perf\naccess. However, exclude_kernel does not suppress text-poke sideband\nrecords. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL\nand contains a raw kernel instruction address.\n\nAn unprivileged task can therefore open and mmap a task-local software\nevent with text_poke=1. Both opening a count-only tracepoint event and\nconfiguring UDP GRO for ESP-in-UDP cause updates to inline static calls;\nthe observer receives the relocated addresses of the modified instructions.\nFor a known kernel image, any such address reveals the runtime kernel\ntext base despite KASLR.\n\nCall perf_allow_kernel() whenever attr.text_poke is set, regardless of\nexclude_kernel. Events that neither monitor kernel execution nor request\ntext-poke records retain their existing permissions.",
  "id": "CVE-2026-98655",
  "modified": "2026-10-19T02:30:48.977878200Z",
  "published": "2026-10-18T15:44:05.722Z",
  "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/357e8a77a501d96c9517f01f4a211eed5e9c9184"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/677d0b51ac1a0db55d768c4c6399210b3de0795b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e506333d1b9f42f1e402acebf1283af3c44a3809"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98655.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98655"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "perf: Require kernel access for text poke events"
}