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tracing: Take the reference before publishing the named histogram trigger

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: tracing: Take the reference before publishing the named histogram trigger event_hist_trigger_named_init() puts the trigger on the global named_triggers list and only then takes the reference on the trigger it shares its histogram with: data->ref++; save_named_trigger(data->named_data->name, data); ret = event_hist_trigger_init(data->named_data); if (ret < 0) { kfree(data->cmd_ops); data->cmd_ops = &trigger_hist_cmd; } return ret; event_hist_trigger_init() fails when alloc_hist_pad() cannot allocate, and nothing takes the trigger back off the list on the way out. event_hist_trigger_parse() frees it, and the next lookup by name reads the freed object: BUG: KASAN: slab-use-after-free in find_named_trigger+0xac/0xc0 Read of size 8 at addr ffff888009346860 by task init/1 find_named_trigger+0xac/0xc0 hist_register_trigger+0xc1/0xa00 event_hist_trigger_parse+0x3146/0x6af0 event_trigger_write+0xce/0x160 Freed by task 67: kfree+0x154/0x420 trigger_kthread_fn+0xfd/0x160 Do the reference first and publish once it has succeeded, so that nothing which can fail runs after the trigger becomes findable.

Announced Source revision 1
Original source ↗

CVE-2026-97919

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-2026-97919

Linux

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

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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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": "ac7ab38c271ba2edaeb0dc35b200ec13339776ae",
        "lessThan": "e5c5dad169fb569161d3eed6c3f6a59e65db1830",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e53a8dcd36b9ebc9229450eb594ae20e0b2ae0fd",
        "lessThan": "b6fb2f5370a9a6aec325ab2db1ca3d1a881499b8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7ab0fc61ce73040f89b12d76a8279995ec283541",
        "lessThan": "2ffaade3611bd9501bc0b9d5d19fc75bfee7a16b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7ab0fc61ce73040f89b12d76a8279995ec283541",
        "lessThan": "91c15cdda6033e2439f5975b938754152f3d6e38",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7ab0fc61ce73040f89b12d76a8279995ec283541",
        "lessThan": "0fe23b8eaba0d3372c66b7b31204408da0715edc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "740dab2338f70d93aa8235db5a9541d846d7b21c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.6.94",
        "lessThan": "6.6.160",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.12.34",
        "lessThan": "6.12.112",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.15.3",
        "lessThan": "6.16",
        "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": "6.16"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.16",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "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-2026-97919

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#48805 · Revision 1
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Publisher date
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