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NVD / CVE Program· CNA Linux

CVE-2026-23309: tracing: Add NULL pointer check to trigger_data_free()

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 13dcd9269e225e4c4ceabdaeebe2ce4661b54c6e, 2ce8ece5a78da67834db7728edc801889a64f643, 42b380f97d65e76e7b310facd525f730272daf57.

Low priority for now. Upgrade to Linux Linux 13dcd9269e225e4c4ceabdaeebe2ce4661b54c6e, 2ce8ece5a78da67834db7728edc801889a64f643, 42b380f97d65e76e7b310facd525f730272daf57 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: tracing: Add NULL pointer check to trigger_data_free() If trigger_data_alloc() fails and returns NULL, event_hist_trigger_parse() jumps to the out_free error path. While kfree() safely handles a NULL pointer, trigger_data_free() does not. This causes a NULL pointer dereference in trigger_data_free() when evaluating data->cmd_ops->set_filter. Fix the problem by adding a NULL pointer check to trigger_data_free(). The problem was found by an experimental code review agent based on gemini-3.1-pro while reviewing backports into v6.18.y.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Mar 25, 2026
Updated
Jun 17, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel6.1.165 and later · before 6.1.167
  • linux linux kernel6.6.128 and later · before 6.6.130
  • linux linux kernel6.12.75 and later · before 6.12.77
  • linux linux kernel6.18.14 and later · before 6.18.17
  • linux linux kernel6.19.4 and later · before 6.19.7
  • linux linux kernel7.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • c10f0efe57728508d796ae4ba7abe4c14ec3d8ef and later · before 13dcd9269e225e4c4ceabdaeebe2ce4661b54c6eaffected · git
    • 7e6556e9329bc484e9dcdab6e346d959267c0636 and later · before 59c15b9cc453b74beb9f04c6c398717e73612dc3affected · git
    • 9b0513905e0598b9f8cfccab8e47497aed5d935d and later · before 42b380f97d65e76e7b310facd525f730272daf57affected · git
    • 335dfe4bc6368e70e8c15419375cf609c4f85558 and later · before 2ce8ece5a78da67834db7728edc801889a64f643affected · git
    • e42efbe9754da78eafe11f6bd3ca9c8a094a752a and later · before 477469223b2b840f436ce204333de87cb17e5d93affected · git
    • 0550069cc25f513ce1f109c88f7c1f01d63297db and later · before 457965c13f0837a289c9164b842d0860133f6274affected · git
    • 6.1.165 and later · before 6.1.167affected · semver
    • 6.6.128 and later · before 6.6.130affected · semver
    • 6.12.75 and later · before 6.12.77affected · semver
    • 6.18.14 and later · before 6.18.17affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:14linuxbefore 6.19.8-16.19.8-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-23306Mar 25, 2026 · scsi: pm8001: Fix use-after-free in pm8001_queue_command()
    31Monitor
  • ← EarlierCVE-2026-23308Mar 25, 2026 · pinctrl: equilibrium: fix warning trace on load
    22Monitor
  • Later →CVE-2026-23311Mar 25, 2026 · perf/core: Fix invalid wait context in ctx_sched_in()
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux13dcd9269e225e4c4ceabdaeebe2ce4661b54c6eVendor (CNA)
Linux Linux2ce8ece5a78da67834db7728edc801889a64f643Vendor (CNA)
Linux Linux42b380f97d65e76e7b310facd525f730272daf57Vendor (CNA)
Linux Linux457965c13f0837a289c9164b842d0860133f6274Vendor (CNA)
Linux Linux477469223b2b840f436ce204333de87cb17e5d93Vendor (CNA)
Linux Linux59c15b9cc453b74beb9f04c6c398717e73612dc3Vendor (CNA)
Linux Linux6.1.167Vendor (CNA)
Linux Linux6.12.77Vendor (CNA)
Linux Linux6.18.17Vendor (CNA)
Linux Linux6.19.7Vendor (CNA)
Linux Linux6.6.130Vendor (CNA)
debian:linux6.19.8-1 · Debian:14Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records