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tracing: Free histogram the var ref when its initialization fails

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: tracing: Free histogram the var ref when its initialization fails create_var_ref() allocates a VAR_REF hist_field and then calls init_var_ref() to fill it in. When that fails the field is leaked. commit 656fe2ba85e8 ("tracing: Use hist trigger's var_ref array to destroy var_refs") made destroy_hist_field() return early for HIST_FIELD_FL_VAR_REF, since var refs are freed by walking the trigger's var_refs[] array instead. create_var_ref() adds the field to that array only after init_var_ref() has succeeded, so on this path the field is in neither place and nothing frees it. The call was correct when it was written, before var refs were taken out of destroy_hist_field(). init_var_ref() cannot free it either. The caller owns the field, so init_var_ref() undoes only its own string allocations and leaves the field alone. Freeing it there would leave create_var_ref() passing freed memory to destroy_hist_field(), which reads its flags. Call __destroy_hist_field(), which frees the field without consulting the flag.

Announced Source revision 1
Original source ↗

CVE-2026-97923

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-2026-97923

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": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
        "lessThan": "608b7751926ec08fae6a1ac4e7308195da68c362",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
        "lessThan": "4870f9071c9ea3c1423a07741b85a794db30d672",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
        "lessThan": "352f84a381e7b4651b30366e93cb858f3fa9c91a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
        "lessThan": "4924328d6991f25b65bb7c8ff5d56c2a9b254851",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
        "lessThan": "74375caa20fe5165807b4334c783d1790b01f02a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
        "lessThan": "222abcbe7866fef04563b6eb89fb21f627dcbc77",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
        "lessThan": "a69baeac38677270656e85753d93856a076dee57",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "656fe2ba85e81d00e4447bf77b8da2be3c47acb2",
        "lessThan": "516001d53e6b2ea95a251ee2ef54a1a689a3fd58",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "836717841a30d7845cdf9cb806ee0ff3bfa7135a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4.19.100",
        "lessThan": "4.20",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "kernel/trace/trace_events_hist.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/trace/trace_events_hist.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-97923

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38072 · Revision 1
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Publisher date
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