CVE-2026-99235 (GCVE-0-2026-99235)

Vulnerability from cvelistv5 – Published: 2026-11-02 16:06 – Updated: 2026-11-03 19:13
VLAI
Title
tracing: Save the event file instead of the compatible histogram
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing: Save the event file instead of the compatible histogram create_field_var_hist() creates a histogram on the matched event to supply a field variable, and records it on the target so it can be torn down later: hist_data = find_compatible_hist(target_hist_data, file); ... /* Save the compatible histogram information */ var_hist->hist_data = hist_data; hist_data is not the histogram it creates. It is one that was already there, whose keys the new one copies. The saved pointer has a single user, unregister_field_var_hists(), which runs when the target is removed: file = hist_data->field_var_hists[i]->hist_data->event_file; find_compatible_hist() matches on keys alone, so it can pick one with no variables of its own. check_var_refs() then returns false and the user can remove it while the target still points at it: BUG: KASAN: slab-use-after-free in event_hist_trigger_free+0x2b2/0x320 Read of size 8 at addr ffff8880093b90e0 by task init/1 Freed by task 1: kfree+0x154/0x420 event_hist_trigger_free+0x1d5/0x320 event_hist_trigger_parse+0x35f3/0x69e0 trigger_process_regex+0x1a6/0x250 Save the event file instead. It is all the dereference ever wanted, and it does not go away when the user removes a trigger.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6649 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 02205a6752f223779a1b0e9e8ffacbea6e717851 , < a6165126b1a1b26342b55be6eb6ee23af8756aba (git)
Affected: 02205a6752f223779a1b0e9e8ffacbea6e717851 , < 173914501b97236d7ea7dc2af7f30feddd4e1436 (git)
Affected: 02205a6752f223779a1b0e9e8ffacbea6e717851 , < ac815a379644b2ad5008a009a3516ada31b5dd82 (git)
Affected: 02205a6752f223779a1b0e9e8ffacbea6e717851 , < 8b307d64a60548e4a74cb746f74d7ed4bd49965e (git)
Affected: 02205a6752f223779a1b0e9e8ffacbea6e717851 , < 7a111ba0d1b74c99bc8f096565dc71945f694254 (git)
Affected: 02205a6752f223779a1b0e9e8ffacbea6e717851 , < 3609ada3c12cecfb0ae5ee82ef4f86c5f18a2dea (git)
Affected: 02205a6752f223779a1b0e9e8ffacbea6e717851 , < 9631dbccd3c649b567a5aafffea6b00634183997 (git)
Affected: 02205a6752f223779a1b0e9e8ffacbea6e717851 , < 7cafc82e6153f05a221be678cd649d02e06ba909 (git)
Affected: 02205a6752f223779a1b0e9e8ffacbea6e717851 , < d5c42664fc094899af9aae5300b27fe8fdb658ef (git)
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Linux Linux Affected: 4.17
Unaffected: 0 , < 4.17 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.161 , ≤ 6.6.* (semver)
Unaffected: 6.12.115 , ≤ 6.12.* (semver)
Unaffected: 6.18.60 , ≤ 6.18.* (semver)
Unaffected: 7.2.14 , ≤ 7.2.* (semver)
Unaffected: 7.3.1 , ≤ 7.3.* (semver)
Unaffected: 7.4-rc1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Save the event file instead of the compatible histogram\n\ncreate_field_var_hist() creates a histogram on the matched event to\nsupply a field variable, and records it on the target so it can be torn\ndown later:\n\n\thist_data = find_compatible_hist(target_hist_data, file);\n\t...\n\t/* Save the compatible histogram information */\n\tvar_hist-\u003ehist_data = hist_data;\n\nhist_data is not the histogram it creates. It is one that was already\nthere, whose keys the new one copies. The saved pointer has a single\nuser, unregister_field_var_hists(), which runs when the target is\nremoved:\n\n\tfile = hist_data-\u003efield_var_hists[i]-\u003ehist_data-\u003eevent_file;\n\nfind_compatible_hist() matches on keys alone, so it can pick one with no\nvariables of its own. check_var_refs() then returns false and the user\ncan remove it while the target still points at it:\n\n BUG: KASAN: slab-use-after-free in event_hist_trigger_free+0x2b2/0x320\n Read of size 8 at addr ffff8880093b90e0 by task init/1\n\n Freed by task 1:\n  kfree+0x154/0x420\n  event_hist_trigger_free+0x1d5/0x320\n  event_hist_trigger_parse+0x35f3/0x69e0\n  trigger_process_regex+0x1a6/0x250\n\nSave the event file instead. It is all the dereference ever wanted, and\nit does not go away when the user removes a trigger."
        }
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            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "AV:L - The attacker-controlled hist text is written locally to events/\u003csys\u003e/\u003cevent\u003e/trigger: event_trigger_write() -\u003e trigger_process_regex() -\u003e event_hist_trigger_parse() -\u003e create_actions()/onmatch_create() -\u003e trace_action_create_field_var() -\u003e create_field_var_hist(). No remote protocol carries the keys or onmatch() field names that make find_compatible_hist() save the dangling pointer.\nAC:L - The attacker writes a keys-only hist on event A, an onmatch().trace() hist on event B so create_field_var_hist() stores A\u0027s hist_data, then \u0027!hist\u0027 on A and on B. find_compatible_hist() matches keys only, so check_var_refs() lets A be removed; event_mutex serializes every write, with no race or victim state.\nPR:L - create_field_var_hist() is reached only after writes to a TRACE_MODE_WRITE (0640) trigger file and to synthetic_events; event_trigger_regex_open() and the synth file enforce LOCKDOWN_TRACEFS and DAC, not capable(). tracefs_parse_param() uid= is applied by tracefs_apply_options() onto those inodes, so a delegated non-root tracing owner can run the onmatch() sequence; userns cannot mount tracefs.\nUI:N - The attacker performs the compatible-hist write, the onmatch().trace() write that calls create_field_var_hist(), and both \u0027!hist\u0027 removals themselves. No other user must mount media, open a file, or enable tracing.\nS:U - The slab use-after-free of the compatible hist_trigger_data is in the host kernel\u0027s tracing heap (event_hist_trigger_free()/unregister_field_var_hists()). It does not cross a VM, IOMMU, or sandbox boundary.\nC:H - unregister_field_var_hists() reads field_var_hists[i]-\u003ehist_data-\u003eevent_file from the hist_trigger_data that event_hist_trigger_free() already kfree\u0027d (KASAN 8-byte read). After reclaiming that slab, the attacker controls the pointer then walked as a trace_event_file, a use-after-free read primitive.\nI:H - That attacker-controlled event_file is passed to event_hist_trigger_parse(\"!hist\"), which list_del_rcu()s file-\u003etriggers and runs cmd_ops-\u003efree on objects taken from the sprayed hist_trigger_data, a heap write and control-flow primitive.\nA:H - The commit reproduces a KASAN slab-use-after-free in event_hist_trigger_free() when the target hist is removed after the compatible one. Without KASAN, the stale hist_data-\u003eevent_file dereference oopses or panics the kernel."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/173914501b97236d7ea7dc2af7f30feddd4e1436"
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        {
          "url": "https://git.kernel.org/stable/c/ac815a379644b2ad5008a009a3516ada31b5dd82"
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        {
          "url": "https://git.kernel.org/stable/c/d5c42664fc094899af9aae5300b27fe8fdb658ef"
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      "title": "tracing: Save the event file instead of the compatible histogram",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99235",
    "datePublished": "2026-11-02T16:06:41.510Z",
    "dateReserved": "2026-09-25T10:25:14.402Z",
    "dateUpdated": "2026-11-03T19:13:03.627Z",
    "state": "PUBLISHED"
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          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Save the event file instead of the compatible histogram\n\ncreate_field_var_hist() creates a histogram on the matched event to\nsupply a field variable, and records it on the target so it can be torn\ndown later:\n\n\thist_data = find_compatible_hist(target_hist_data, file);\n\t...\n\t/* Save the compatible histogram information */\n\tvar_hist-\u003ehist_data = hist_data;\n\nhist_data is not the histogram it creates. It is one that was already\nthere, whose keys the new one copies. The saved pointer has a single\nuser, unregister_field_var_hists(), which runs when the target is\nremoved:\n\n\tfile = hist_data-\u003efield_var_hists[i]-\u003ehist_data-\u003eevent_file;\n\nfind_compatible_hist() matches on keys alone, so it can pick one with no\nvariables of its own. check_var_refs() then returns false and the user\ncan remove it while the target still points at it:\n\n BUG: KASAN: slab-use-after-free in event_hist_trigger_free+0x2b2/0x320\n Read of size 8 at addr ffff8880093b90e0 by task init/1\n\n Freed by task 1:\n  kfree+0x154/0x420\n  event_hist_trigger_free+0x1d5/0x320\n  event_hist_trigger_parse+0x35f3/0x69e0\n  trigger_process_regex+0x1a6/0x250\n\nSave the event file instead. It is all the dereference ever wanted, and\nit does not go away when the user removes a trigger."
          }
        ],
        "id": "CVE-2026-99235",
        "lastModified": "2026-11-03T20:18:29.627",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-11-02T16:17:48.790",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/173914501b97236d7ea7dc2af7f30feddd4e1436"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3609ada3c12cecfb0ae5ee82ef4f86c5f18a2dea"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7a111ba0d1b74c99bc8f096565dc71945f694254"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7cafc82e6153f05a221be678cd649d02e06ba909"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8b307d64a60548e4a74cb746f74d7ed4bd49965e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9631dbccd3c649b567a5aafffea6b00634183997"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a6165126b1a1b26342b55be6eb6ee23af8756aba"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ac815a379644b2ad5008a009a3516ada31b5dd82"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d5c42664fc094899af9aae5300b27fe8fdb658ef"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-11-04T16:20:57+00:00",
      "cve": "CVE-2026-99235",
      "id": "CVE-2026-99235",
      "initial_release_date": "2026-11-02T16:06:41.510000+00:00",
      "product_status:known_affected": "238",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: Privilege escalation via use-after-free in event tracing subsystem",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99235.json",
      "version": "3"
    }
  }
}



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