{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "a4072fe85ba3671720cab0788291af953db27318"
            },
            {
              "fixed": "cfad128171f8e2237a3c723d6478ef2cfb3b9127"
            },
            {
              "fixed": "65d1e28198f344832a8a63e8ccf84b8f65b92a32"
            },
            {
              "fixed": "6ede78d0563a2a3ae3e46f9c07cedb5d79645429"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.17.0"
            },
            {
              "fixed": "6.18.53"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97935.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Set the trace clock before registering the histogram trigger\n\nhist_register_trigger() puts the trigger on the global named_triggers\nlist in cmd_ops-\u003einit(), and only then sets the trace clock:\n\n\tif (data-\u003ecmd_ops-\u003einit) {\n\t\tret = data-\u003ecmd_ops-\u003einit(data);\n\t\tif (ret \u003c 0)\n\t\t\tgoto out;\n\t}\n\n\tif (hist_data-\u003eenable_timestamps) {\n\t\tret = tracing_set_clock(file-\u003etr, hist_data-\u003eattrs-\u003eclock);\n\t\tif (ret) {\n\t\t\thist_err(tr, HIST_ERR_SET_CLOCK_FAIL, errpos(clock));\n\t\t\tgoto out;\n\t\t}\n\nThe clock string is not checked anywhere before that call, so a named\ntrigger using common_timestamp with an unknown clock fails after it has\nalready become findable. event_hist_trigger_parse() then frees it\nwithout taking it off the list, and the next lookup by name reads the\nfreed object:\n\n ~# cd /sys/kernel/tracing/events/sched/sched_switch\n ~# echo 'hist:name=foo:keys=common_pid:ts=common_timestamp:clock=bogus' \u003e trigger\n bash: echo: write error: Invalid argument\n ~# echo 'hist:name=foo:keys=common_pid' \u003e trigger\n\n  BUG: KASAN: slab-use-after-free in find_named_trigger+0xac/0xc0\n  Read of size 8 at addr ffff88800915d760 by task init/1\n   find_named_trigger+0xac/0xc0\n   hist_register_trigger+0xc1/0x900\n   event_hist_trigger_parse+0x3146/0x6af0\n   event_trigger_write+0xce/0x160\n  Freed by task 63:\n   kfree+0x154/0x420\n   trigger_kthread_fn+0xfd/0x160\n\nSet the clock before the trigger is registered, so that nothing which\ncan fail runs after it is published, the way commit 6f86bdeab633\n(\"tracing: Fix bad hist from corrupting named_triggers list\") moved the\nregistration below the rest of the setup.\n\ntracing_set_filter_buffering() is reference counted, so the init failure\npath has to drop the reference that the clock block now takes first.",
  "id": "CVE-2026-97935",
  "modified": "2026-09-27T03:30:21.960614199Z",
  "published": "2026-09-25T10:22:49.820Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65d1e28198f344832a8a63e8ccf84b8f65b92a32"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ede78d0563a2a3ae3e46f9c07cedb5d79645429"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cfad128171f8e2237a3c723d6478ef2cfb3b9127"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97935.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97935"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "tracing: Set the trace clock before registering the histogram trigger"
}