CVE-2026-46196 (GCVE-0-2026-46196)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:36 – Updated: 2026-06-14 18:01
VLAI
Title
tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func()
Summary
In the Linux kernel, the following vulnerability has been resolved: tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func() When a tracepoint goes through the 0 -> 1 transition, tracepoint_add_func() invokes the subsystem's ext->regfunc() before attempting to install the new probe via func_add(). If func_add() then fails (for example, when allocate_probes() cannot allocate a new probe array under memory pressure and returns -ENOMEM), the function returns the error without calling the matching ext->unregfunc(), leaving the side effects of regfunc() behind with no installed probe to justify them. For syscall tracepoints this is particularly unpleasant: syscall_regfunc() bumps sys_tracepoint_refcount and sets SYSCALL_TRACEPOINT on every task. After a leaked failure, the refcount is stuck at a non-zero value with no consumer, and every task continues paying the syscall trace entry/exit overhead until reboot. Other subsystems providing regfunc()/unregfunc() pairs exhibit similarly scoped persistent state. Mirror the existing 1 -> 0 cleanup and call ext->unregfunc() in the func_add() error path, gated on the same condition used there so the unwind is symmetric with the registration.
Assigner
Impacted products
Vendor Product Version
Linux Linux Affected: 8cf868affdc459beee1a941df0cfaba1673740e3 , < 247ed8a969f981bfba3112fd4bb441eaa6cef59c (git)
Affected: 8cf868affdc459beee1a941df0cfaba1673740e3 , < 7bcadb3c2bc1cf60690e931aadd35fb7bd646a49 (git)
Affected: 8cf868affdc459beee1a941df0cfaba1673740e3 , < 2c5b8eeea006eb694c81631cd5713d494b80be90 (git)
Affected: 8cf868affdc459beee1a941df0cfaba1673740e3 , < 342829e042ac00f3d68d442ea92873fb6683f494 (git)
Affected: 8cf868affdc459beee1a941df0cfaba1673740e3 , < fad217e16fded7f3c09f8637b0f6a224d58b5f2e (git)
Create a notification for this product.
Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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Show details on NVD website

{
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      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/tracepoint.c"
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              "version": "7.0.7",
              "versionType": "semver"
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              "status": "unaffected",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracepoint: balance regfunc() on func_add() failure in tracepoint_add_func()\n\nWhen a tracepoint goes through the 0 -\u003e 1 transition, tracepoint_add_func()\ninvokes the subsystem\u0027s ext-\u003eregfunc() before attempting to install the\nnew probe via func_add(). If func_add() then fails (for example, when\nallocate_probes() cannot allocate a new probe array under memory pressure\nand returns -ENOMEM), the function returns the error without calling the\nmatching ext-\u003eunregfunc(), leaving the side effects of regfunc() behind\nwith no installed probe to justify them.\n\nFor syscall tracepoints this is particularly unpleasant: syscall_regfunc()\nbumps sys_tracepoint_refcount and sets SYSCALL_TRACEPOINT on every task.\nAfter a leaked failure, the refcount is stuck at a non-zero value with no\nconsumer, and every task continues paying the syscall trace entry/exit\noverhead until reboot. Other subsystems providing regfunc()/unregfunc()\npairs exhibit similarly scoped persistent state.\n\nMirror the existing 1 -\u003e 0 cleanup and call ext-\u003eunregfunc() in the\nfunc_add() error path, gated on the same condition used there so the\nunwind is symmetric with the registration."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T18:01:54.236Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
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        },
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          "url": "https://git.kernel.org/stable/c/342829e042ac00f3d68d442ea92873fb6683f494"
        },
        {
          "url": "https://git.kernel.org/stable/c/fad217e16fded7f3c09f8637b0f6a224d58b5f2e"
        }
      ],
      "title": "tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func()",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46196",
    "datePublished": "2026-05-28T09:36:49.293Z",
    "dateReserved": "2026-05-13T15:03:33.104Z",
    "dateUpdated": "2026-06-14T18:01:54.236Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-06-16",
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      "percentile": "0.02701"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46196\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-28T10:16:35.253\",\"lastModified\":\"2026-06-10T19:18:27.070\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntracepoint: balance regfunc() on func_add() failure in tracepoint_add_func()\\n\\nWhen a tracepoint goes through the 0 -\u003e 1 transition, tracepoint_add_func()\\ninvokes the subsystem\u0027s ext-\u003eregfunc() before attempting to install the\\nnew probe via func_add(). If func_add() then fails (for example, when\\nallocate_probes() cannot allocate a new probe array under memory pressure\\nand returns -ENOMEM), the function returns the error without calling the\\nmatching ext-\u003eunregfunc(), leaving the side effects of regfunc() behind\\nwith no installed probe to justify them.\\n\\nFor syscall tracepoints this is particularly unpleasant: syscall_regfunc()\\nbumps sys_tracepoint_refcount and sets SYSCALL_TRACEPOINT on every task.\\nAfter a leaked failure, the refcount is stuck at a non-zero value with no\\nconsumer, and every task continues paying the syscall trace entry/exit\\noverhead until reboot. Other subsystems providing regfunc()/unregfunc()\\npairs exhibit similarly scoped persistent state.\\n\\nMirror the existing 1 -\u003e 0 cleanup and call ext-\u003eunregfunc() in the\\nfunc_add() error path, gated on the same condition used there so the\\nunwind is symmetric with the registration.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.10\",\"versionEndExcluding\":\"6.6.140\",\"matchCriteriaId\":\"1CDBDDA2-4E4B-4908-9ACD-0A1C61DC1753\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.88\",\"matchCriteriaId\":\"5AFBE0EC-CCDF-4207-AE92-ABF958125CA4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.30\",\"matchCriteriaId\":\"BF39AE08-AE6D-4410-8FBE-76F6BF5BF55B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.0.7\",\"matchCriteriaId\":\"D0893CA7-9AE6-4DFE-AC75-48967D73AD8E\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/247ed8a969f981bfba3112fd4bb441eaa6cef59c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2c5b8eeea006eb694c81631cd5713d494b80be90\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/342829e042ac00f3d68d442ea92873fb6683f494\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7bcadb3c2bc1cf60690e931aadd35fb7bd646a49\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fad217e16fded7f3c09f8637b0f6a224d58b5f2e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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