CVE-2026-89746Public exploit

Kernel panic via dangling histogram variable

Published Sep 11, 2026 · Updated Sep 11, 2026

Use-after-free in Linux kernel tracing allows local users with tracefs write access to crash the system using same-name histogram triggers. The named-data branch of hist_register_trigger() frees duplicate hist_data without removing its tr->hist_vars entry, so find_var_file() later dereferences the dangling pointer. Writing the required three trigger definitions requires privileged tracefs access; the final write causes a kernel panic and service interruption.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel tracing allows local users with tracefs write access to crash the system using same-name histogram triggers. The named-data branch of hist_register_trigger() frees duplicate hist_data without removing its tr->hist_vars entry, so find_var_file() later dereferences the dangling pointer. Writing the required three trigger definitions requires privileged tracefs access; the final write causes a kernel panic and service interruption.

The record

CVE
CVE-2026-89746
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=435d2964af815aae456db554c62963b4515f19d0 <477d762be4b0ffaf01429ccd88859e93b0ec28cc
  2. Affected versionversion=43b254d46c740bf9dbe65709afa021dd726dfa99
  3. Affected versionversion=5ae1b18f05ee2b849dc03b6c15d7da0c1c6efa77
  4. Affected versionversion=6.1.130 <6.2
  5. Affected versionversion=6.12.18 <6.12.109
  6. Affected versionversion=6.13.6 <6.14
  7. Affected versionversion=6.14
  8. Affected versionversion=6.6.81 <6.7
  9. Affected versionversion=6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e <83d1ae0406d8eade219a81b401e201702dd9dc55
  10. Affected versionversion=6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e <a7318172aa332a161fb9618286e64454c827f8fd
  11. Affected versionversion=6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e <b1a49c22de01faf176d44e5caa765e237353a579
  12. Affected versionversion=f1ae50cfb818ce1ac7a674406dfadb7653e2552d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=435d2964af815aae456db554c62963b4515f19d0 <477d762be4b0ffaf01429ccd88859e93b0ec28cc; version=43b254d46c740bf9dbe65709afa021dd726dfa99; version=5ae1b18f05ee2b849dc03b6c15d7da0c1c6efa77; version=6.1.130 <6.2; version=6.12.18 <6.12.109; version=6.13.6 <6.14; version=6.14; version=6.6.81 <6.7; version=6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e <83d1ae0406d8eade219a81b401e201702dd9dc55; version=6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e <a7318172aa332a161fb9618286e64454c827f8fd; version=6f86bdeab633a56d5c6dccf1a2c5989b6a5e323e <b1a49c22de01faf176d44e5caa765e237353a579; version=f1ae50cfb818ce1ac7a674406dfadb7653e2552d

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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