CVE-2026-98856 (GCVE-0-2026-98856)
Vulnerability from cvelistv5
Published
2026-10-18 15:51
Modified
2026-10-30 12:40
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: kprobes: Skip disarmed probes when checking optkprobe overlap On x86, an optkprobe at A replaces five bytes with a jump. If a disabled probe B is at A+2, get_optimized_kprobe() stops at B when arming a new probe C at A+4. It leaves A optimized: A A+1 A+2 A+3 A+4 A's jump | e9 | d0 | d1 | d2 | d3 | after C | e9 | d0 | d1 | d2 | cc | The INT3 for C overwrites the last byte of A's jump displacement, so execution can jump to the wrong address. B can have prepared optinsns while disarmed, but has no jump to unoptimize. Continue past disarmed and unprepared probes to find the active optimized probe before arming a probe in its jump.
References
Impacted products
Vendor Product Version
Linux Linux Version: afd66255b9a48f5851326ddae50e2203fbf71dc9
Version: afd66255b9a48f5851326ddae50e2203fbf71dc9
Version: afd66255b9a48f5851326ddae50e2203fbf71dc9
Version: afd66255b9a48f5851326ddae50e2203fbf71dc9
Version: afd66255b9a48f5851326ddae50e2203fbf71dc9
Version: afd66255b9a48f5851326ddae50e2203fbf71dc9
Version: afd66255b9a48f5851326ddae50e2203fbf71dc9
Version: afd66255b9a48f5851326ddae50e2203fbf71dc9
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{
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s 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\u0027s 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:40:17.396Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e29e819cacfb4e3cd56d41eb704ab4718d6d2915"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab9ed9faa67bf67383ff7e1479655e232a843c2b"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b0f604df9e2b9a456f1ae5266a439998c4c8826"
        },
        {
          "url": "https://git.kernel.org/stable/c/3f968dcdf018861129f97910fa7bd680d939a9b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/985a568171e7bdba6dcde3420d0e5bb515813457"
        },
        {
          "url": "https://git.kernel.org/stable/c/6745fa65f4115045431c0c15610e876855a04625"
        },
        {
          "url": "https://git.kernel.org/stable/c/526fac219e8b7d3369b43026bd0a1df51b811cd4"
        },
        {
          "url": "https://git.kernel.org/stable/c/7a39c732a22ec4a369af9e19fbe3d666ec83eec4"
        }
      ],
      "title": "kprobes: Skip disarmed probes when checking optkprobe overlap",
      "x_generator": {
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      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98856",
    "datePublished": "2026-10-18T15:51:12.359Z",
    "dateReserved": "2026-09-25T10:25:14.376Z",
    "dateUpdated": "2026-10-30T12:40:17.396Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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