FKIE_CVE-2026-97919

Vulnerability from fkie_nvd - Published: 2026-09-25 11:17 - Updated: 2026-09-25 11:17
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0fe23b8eaba0d3372c66b7b31204408da0715edc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2ffaade3611bd9501bc0b9d5d19fc75bfee7a16b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/91c15cdda6033e2439f5975b938754152f3d6e38
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_events_hist.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2ffaade3611bd9501bc0b9d5d19fc75bfee7a16b",
              "status": "affected",
              "version": "7ab0fc61ce73040f89b12d76a8279995ec283541",
              "versionType": "git"
            },
            {
              "lessThan": "91c15cdda6033e2439f5975b938754152f3d6e38",
              "status": "affected",
              "version": "7ab0fc61ce73040f89b12d76a8279995ec283541",
              "versionType": "git"
            },
            {
              "lessThan": "0fe23b8eaba0d3372c66b7b31204408da0715edc",
              "status": "affected",
              "version": "7ab0fc61ce73040f89b12d76a8279995ec283541",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ac7ab38c271ba2edaeb0dc35b200ec13339776ae",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e53a8dcd36b9ebc9229450eb594ae20e0b2ae0fd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "740dab2338f70d93aa8235db5a9541d846d7b21c",
              "versionType": "git"
            },
            {
              "lessThan": "6.7",
              "status": "affected",
              "version": "6.6.94",
              "versionType": "semver"
            },
            {
              "lessThan": "6.13",
              "status": "affected",
              "version": "6.12.34",
              "versionType": "semver"
            },
            {
              "lessThan": "6.16",
              "status": "affected",
              "version": "6.15.3",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_events_hist.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc3",
              "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: Take the reference before publishing the named histogram trigger\n\nevent_hist_trigger_named_init() puts the trigger on the global\nnamed_triggers list and only then takes the reference on the trigger it\nshares its histogram with:\n\n\tdata-\u003eref++;\n\n\tsave_named_trigger(data-\u003enamed_data-\u003ename, data);\n\n\tret = event_hist_trigger_init(data-\u003enamed_data);\n\tif (ret \u003c 0) {\n\t\tkfree(data-\u003ecmd_ops);\n\t\tdata-\u003ecmd_ops = \u0026trigger_hist_cmd;\n\t}\n\n\treturn ret;\n\nevent_hist_trigger_init() fails when alloc_hist_pad() cannot allocate, and\nnothing takes the trigger back off the list on the way out.\nevent_hist_trigger_parse() frees it, and the next lookup by name reads the\nfreed object:\n\n BUG: KASAN: slab-use-after-free in find_named_trigger+0xac/0xc0\n Read of size 8 at addr ffff888009346860 by task init/1\n  find_named_trigger+0xac/0xc0\n  hist_register_trigger+0xc1/0xa00\n  event_hist_trigger_parse+0x3146/0x6af0\n  event_trigger_write+0xce/0x160\n Freed by task 67:\n  kfree+0x154/0x420\n  trigger_kthread_fn+0xfd/0x160\n\nDo the reference first and publish once it has succeeded, so that nothing\nwhich can fail runs after the trigger becomes findable."
    }
  ],
  "id": "CVE-2026-97919",
  "lastModified": "2026-09-25T11:17:18.923",
  "metrics": {},
  "published": "2026-09-25T11:17:18.923",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0fe23b8eaba0d3372c66b7b31204408da0715edc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2ffaade3611bd9501bc0b9d5d19fc75bfee7a16b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/91c15cdda6033e2439f5975b938754152f3d6e38"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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