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CVE-2026-99235

tracing: Save the event file instead of the compatible histogram

No exploitation reported by the sources we read.

  • Published2026-11-02

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-11-0216:06CVE publishedCNA

Observed activity

isMalicious corpus · updated 2026-11-02 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-99235?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-99235?format=csv
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Versions per branch

Products declared by the CNA

As Linux, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • Linuxother versions: not affected

    https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

    Affected
    • ≥ 02205a6752f223779a1b0e9e8ffacbea6e717851, < a6165126b1a1b26342b55be6eb6ee23af8756abafixed in a6165126b1a1b26342b55be6eb6ee23af8756abagit
    • ≥ 02205a6752f223779a1b0e9e8ffacbea6e717851, < 173914501b97236d7ea7dc2af7f30feddd4e1436fixed in 173914501b97236d7ea7dc2af7f30feddd4e1436git
    • ≥ 02205a6752f223779a1b0e9e8ffacbea6e717851, < ac815a379644b2ad5008a009a3516ada31b5dd82fixed in ac815a379644b2ad5008a009a3516ada31b5dd82git
    • ≥ 02205a6752f223779a1b0e9e8ffacbea6e717851, < 8b307d64a60548e4a74cb746f74d7ed4bd49965efixed in 8b307d64a60548e4a74cb746f74d7ed4bd49965egit
    • ≥ 02205a6752f223779a1b0e9e8ffacbea6e717851, < 7a111ba0d1b74c99bc8f096565dc71945f694254fixed in 7a111ba0d1b74c99bc8f096565dc71945f694254git
    • ≥ 02205a6752f223779a1b0e9e8ffacbea6e717851, < 3609ada3c12cecfb0ae5ee82ef4f86c5f18a2deafixed in 3609ada3c12cecfb0ae5ee82ef4f86c5f18a2deagit
    • ≥ 02205a6752f223779a1b0e9e8ffacbea6e717851, < 9631dbccd3c649b567a5aafffea6b00634183997fixed in 9631dbccd3c649b567a5aafffea6b00634183997git
    • ≥ 02205a6752f223779a1b0e9e8ffacbea6e717851, < 7cafc82e6153f05a221be678cd649d02e06ba909fixed in 7cafc82e6153f05a221be678cd649d02e06ba909git
  • Linuxother versions: affected

    https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

    Affected
    • = 4.17no fix stated

    Not affected < 4.17 · ≥ 5.10.273, ≤ 5.10.* · ≥ 5.15.224, ≤ 5.15.* · ≥ 6.1.191, ≤ 6.1.* · ≥ 6.6.161, ≤ 6.6.* · ≥ 6.12.115, ≤ 6.12.* · ≥ 6.18.60, ≤ 6.18.*

    2 more version lines in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-02

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-99235 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE record2026-11-02
  • CNACVSS 3.17.82026-11-02

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2026-11-02

Frequently asked questions

What is CVE-2026-99235?

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.

Is CVE-2026-99235 actively exploited?

Active exploitation of CVE-2026-99235 has not been confirmed.

What is the CVSS score for CVE-2026-99235?

CVE-2026-99235 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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