CVE-2026-98856 (GCVE-0-2026-98856)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:51 – Updated: 2026-10-18 15:51
VLAI
Title
kprobes: Skip disarmed probes when checking optkprobe overlap
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7100 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: afd66255b9a48f5851326ddae50e2203fbf71dc9 , < 985a568171e7bdba6dcde3420d0e5bb515813457 (git)
Affected: afd66255b9a48f5851326ddae50e2203fbf71dc9 , < 6745fa65f4115045431c0c15610e876855a04625 (git)
Affected: afd66255b9a48f5851326ddae50e2203fbf71dc9 , < 526fac219e8b7d3369b43026bd0a1df51b811cd4 (git)
Affected: afd66255b9a48f5851326ddae50e2203fbf71dc9 , < 7a39c732a22ec4a369af9e19fbe3d666ec83eec4 (git)
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Linux Linux Affected: 2.6.34
Unaffected: 0 , < 2.6.34 (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc6 , ≤ * (original_commit_for_fix)
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          "product": "Linux",
          "programFiles": [
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          "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."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-10-18T15:51:12.359Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "kprobes: Skip disarmed probes when checking optkprobe overlap",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98856",
    "datePublished": "2026-10-18T15:51:12.359Z",
    "dateReserved": "2026-09-25T10:25:14.376Z",
    "dateUpdated": "2026-10-18T15:51:12.359Z",
    "state": "PUBLISHED"
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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."
          }
        ],
        "id": "CVE-2026-98856",
        "lastModified": "2026-10-18T16:17:40.050",
        "metrics": {},
        "published": "2026-10-18T16:17:40.050",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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}



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