Medium 5.5Published Mar 25, 2026

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

Updated under an hour ago (Oct 27, 2026, 8:40 AM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from c10f0efe57728508d796ae4ba7abe4c14ec3d8ef before 13dcd9269e225e4c4ceabdaeebe2ce4661b54c6e; from 7e6556e9329bc484e9dcdab6e346d959267c0636 before 59c15b9cc453b74beb9f04c6c398717e73612dc3; from 9b0513905e0598b9f8cfccab8e47497aed5d935d before 42b380f97d65e76e7b310facd525f730272daf57; 335dfe4bc6368e70e8c15419375cf609c4f85558 builds before 2ce8ece5a78da67834db7728edc801889a64f643; from e42efbe9754da78eafe11f6bd3ca9c8a094a752a before 477469223b2b840f436ce204333de87cb17e5d93; 0550069cc25f513ce1f109c88f7c1f01d63297db builds before 457965c13f0837a289c9164b842d0860133f6274	CNA record
linux linux_kernel linux:linux_kernel	from 6.1.165 before 6.1.167; from 6.6.128 before 6.6.130; from 6.12.75 before 6.12.77; from 6.18.14 before 6.18.17; from 6.19.4 before 6.19.7; 7.0; 7.0	NVD

References

References

https://git.kernel.org/stable/c/13dcd9269e225e4c4ceabdaeebe2ce4661b54c6e	patch
https://git.kernel.org/stable/c/59c15b9cc453b74beb9f04c6c398717e73612dc3	patch
https://git.kernel.org/stable/c/42b380f97d65e76e7b310facd525f730272daf57	patch
https://git.kernel.org/stable/c/2ce8ece5a78da67834db7728edc801889a64f643	patch
https://git.kernel.org/stable/c/477469223b2b840f436ce204333de87cb17e5d93	patch
https://git.kernel.org/stable/c/457965c13f0837a289c9164b842d0860133f6274	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.