{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "afd66255b9a48f5851326ddae50e2203fbf71dc9"
            },
            {
              "fixed": "985a568171e7bdba6dcde3420d0e5bb515813457"
            },
            {
              "fixed": "6745fa65f4115045431c0c15610e876855a04625"
            },
            {
              "fixed": "526fac219e8b7d3369b43026bd0a1df51b811cd4"
            },
            {
              "fixed": "7a39c732a22ec4a369af9e19fbe3d666ec83eec4"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.34"
            },
            {
              "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-2026-98856.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nkprobes: Skip disarmed probes when checking optkprobe overlap\n\nOn x86, an optkprobe at A replaces five bytes with a jump. If a disabled\nprobe B is at A+2, get_optimized_kprobe() stops at B when arming a new\nprobe C at A+4. It leaves A optimized:\n\n              A    A+1  A+2  A+3  A+4\n  A's jump  | e9 | d0 | d1 | d2 | d3 |\n  after C   | e9 | d0 | d1 | d2 | cc |\n\nThe INT3 for C overwrites the last byte of A's jump displacement, so\nexecution can jump to the wrong address. B can have prepared optinsns\nwhile disarmed, but has no jump to unoptimize.\n\nContinue past disarmed and unprepared probes to find the active optimized\nprobe before arming a probe in its jump.",
  "id": "CVE-2026-98856",
  "modified": "2026-10-19T02:30:47.128818627Z",
  "published": "2026-10-18T15:51:12.359Z",
  "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/526fac219e8b7d3369b43026bd0a1df51b811cd4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6745fa65f4115045431c0c15610e876855a04625"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7a39c732a22ec4a369af9e19fbe3d666ec83eec4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/985a568171e7bdba6dcde3420d0e5bb515813457"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98856.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98856"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "kprobes: Skip disarmed probes when checking optkprobe overlap"
}