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tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func()

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-46196

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-46196

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "8cf868affdc459beee1a941df0cfaba1673740e3",
        "lessThan": "5787052e5f69beb649f3d6a80a8aa37d9e683e4e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8cf868affdc459beee1a941df0cfaba1673740e3",
        "lessThan": "4f1756d043e56ea2e9a6c858fb290a0cf6fc2251",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8cf868affdc459beee1a941df0cfaba1673740e3",
        "lessThan": "36ff362235307af95152d510b53c2d9b8773a342",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8cf868affdc459beee1a941df0cfaba1673740e3",
        "lessThan": "247ed8a969f981bfba3112fd4bb441eaa6cef59c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8cf868affdc459beee1a941df0cfaba1673740e3",
        "lessThan": "7bcadb3c2bc1cf60690e931aadd35fb7bd646a49",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8cf868affdc459beee1a941df0cfaba1673740e3",
        "lessThan": "2c5b8eeea006eb694c81631cd5713d494b80be90",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8cf868affdc459beee1a941df0cfaba1673740e3",
        "lessThan": "342829e042ac00f3d68d442ea92873fb6683f494",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8cf868affdc459beee1a941df0cfaba1673740e3",
        "lessThan": "fad217e16fded7f3c09f8637b0f6a224d58b5f2e",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "kernel/tracepoint.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.10"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.10",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.140",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.88",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.30",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/tracepoint.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-46196

Source reference: /cveMetadata/cveId

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No explicit severity was provided.

Event
#28409 · Revision 1
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