FKIE_CVE-2026-99236

Vulnerability from fkie_nvd - Published: 2026-11-02 16:17 - Updated: 2026-11-03 20:18
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing: Reject incomplete event filter expressions A non-empty expression normally finishes in predicate_parse()'s inner loop, which resolves the pending logical operators before jumping to finalization. If the input ends after an operator, possibly followed by unary '!' tokens, the outer loop instead falls through with unresolved operator state. For example, "common_pid == 1 || common_pid == 2 &&" leaves prog[0].target equal to -1. The second pass then reads prog[-1] before the forward-jump check can reject it. Depending on adjacent slab contents, it can also copy an out-of-bounds word into a branch target that passes the forward-only check. A self-targeted perf tracepoint counting event can reach this path through PERF_EVENT_IOC_SET_FILTER. Reject the outer-loop fallthrough when a predicate has already been parsed. This ensures that non-empty expressions only reach finalization after the inner loop has resolved their operators. Keep the existing no-filter error for input that has no predicates. Add a regression test for trailing logical operators and unary negations.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1008e9e0b8280d47f1ab5e9c113f666a023a9697
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/15ff3cc7f2beecc3f95d66358f20ad7b057466aa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1fdc4164e488916402badddbb1f51e9380dabb91
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2a98f5d4913ec081e08e1075512cb7ec313d9f72
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4a1a6d35359991c5d47f4bf101cfbe1475c94093
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5a999b5a16530898f0dbe5f8c50fd45ea72e110b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5bcdf3c18c3471122ee9652b0e2f5cdb718d9a46
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/64993d970dde2a2da353e9e99595a4fa88ec27d9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b205ff58e02922ac324f931cf9eb238a3acdb048
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_events_filter.c",
            "tools/testing/selftests/ftrace/test.d/filter/event-filter-incomplete.tc"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4a1a6d35359991c5d47f4bf101cfbe1475c94093",
              "status": "affected",
              "version": "80765597bc587feae8dbc8ce97a0f32e12a6e625",
              "versionType": "git"
            },
            {
              "lessThan": "2a98f5d4913ec081e08e1075512cb7ec313d9f72",
              "status": "affected",
              "version": "80765597bc587feae8dbc8ce97a0f32e12a6e625",
              "versionType": "git"
            },
            {
              "lessThan": "15ff3cc7f2beecc3f95d66358f20ad7b057466aa",
              "status": "affected",
              "version": "80765597bc587feae8dbc8ce97a0f32e12a6e625",
              "versionType": "git"
            },
            {
              "lessThan": "b205ff58e02922ac324f931cf9eb238a3acdb048",
              "status": "affected",
              "version": "80765597bc587feae8dbc8ce97a0f32e12a6e625",
              "versionType": "git"
            },
            {
              "lessThan": "5a999b5a16530898f0dbe5f8c50fd45ea72e110b",
              "status": "affected",
              "version": "80765597bc587feae8dbc8ce97a0f32e12a6e625",
              "versionType": "git"
            },
            {
              "lessThan": "1008e9e0b8280d47f1ab5e9c113f666a023a9697",
              "status": "affected",
              "version": "80765597bc587feae8dbc8ce97a0f32e12a6e625",
              "versionType": "git"
            },
            {
              "lessThan": "64993d970dde2a2da353e9e99595a4fa88ec27d9",
              "status": "affected",
              "version": "80765597bc587feae8dbc8ce97a0f32e12a6e625",
              "versionType": "git"
            },
            {
              "lessThan": "5bcdf3c18c3471122ee9652b0e2f5cdb718d9a46",
              "status": "affected",
              "version": "80765597bc587feae8dbc8ce97a0f32e12a6e625",
              "versionType": "git"
            },
            {
              "lessThan": "1fdc4164e488916402badddbb1f51e9380dabb91",
              "status": "affected",
              "version": "80765597bc587feae8dbc8ce97a0f32e12a6e625",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_events_filter.c",
            "tools/testing/selftests/ftrace/test.d/filter/event-filter-incomplete.tc"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.17"
            },
            {
              "lessThan": "4.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.273",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.224",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.161",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.115",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.60",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.3.*",
              "status": "unaffected",
              "version": "7.3.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.4-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Reject incomplete event filter expressions\n\nA non-empty expression normally finishes in predicate_parse()\u0027s inner\nloop, which resolves the pending logical operators before jumping to\nfinalization. If the input ends after an operator, possibly followed by\nunary \u0027!\u0027 tokens, the outer loop instead falls through with unresolved\noperator state.\n\nFor example, \"common_pid == 1 || common_pid == 2 \u0026\u0026\" leaves\nprog[0].target equal to -1. The second pass then reads prog[-1] before\nthe forward-jump check can reject it. Depending on adjacent slab\ncontents, it can also copy an out-of-bounds word into a branch target\nthat passes the forward-only check. A self-targeted perf tracepoint\ncounting event can reach this path through PERF_EVENT_IOC_SET_FILTER.\n\nReject the outer-loop fallthrough when a predicate has already been\nparsed. This ensures that non-empty expressions only reach finalization\nafter the inner loop has resolved their operators. Keep the existing\nno-filter error for input that has no predicates. Add a regression test\nfor trailing logical operators and unary negations."
    }
  ],
  "id": "CVE-2026-99236",
  "lastModified": "2026-11-03T20:18:29.827",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-11-02T16:17:49.003",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1008e9e0b8280d47f1ab5e9c113f666a023a9697"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/15ff3cc7f2beecc3f95d66358f20ad7b057466aa"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1fdc4164e488916402badddbb1f51e9380dabb91"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2a98f5d4913ec081e08e1075512cb7ec313d9f72"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4a1a6d35359991c5d47f4bf101cfbe1475c94093"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5a999b5a16530898f0dbe5f8c50fd45ea72e110b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5bcdf3c18c3471122ee9652b0e2f5cdb718d9a46"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/64993d970dde2a2da353e9e99595a4fa88ec27d9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b205ff58e02922ac324f931cf9eb238a3acdb048"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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