CVE-2026-72126

Kernel crash or code execution via timer race

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in the Linux kernel CAN ISO-TP module allows local users to crash the kernel or execute code via a netdevice race. isotp_notify clears the socket's bound state without an RCU grace period, causing isotp_release to skip synchronization and cancel a timer while isotp_rcv can rearm it. Exploitation requires local low-privileged access and precise race timing; a successful attempt invokes a timer callback on a freed socket.

CVSS severity7.8
High
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 the Linux kernel CAN ISO-TP module allows local users to crash the kernel or execute code via a netdevice race. isotp_notify clears the socket's bound state without an RCU grace period, causing isotp_release to skip synchronization and cancel a timer while isotp_rcv can rearm it. Exploitation requires local low-privileged access and precise race timing; a successful attempt invokes a timer callback on a freed socket.

The record

CVE
CVE-2026-72126
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-367, CAPEC-29, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=14a4696bc3118ba49da28f79280e1d55603aa737 <15413a082df69175c2f96aeab4c26fe1ff7cff03
  2. Affected versionversion=14a4696bc3118ba49da28f79280e1d55603aa737 <59672aa4bcd8d32172c1ff6a179583981d6acabc
  3. Affected versionversion=14a4696bc3118ba49da28f79280e1d55603aa737 <6280eda96e0707264849fa7d036fed873c1f8a6d
  4. Affected versionversion=14a4696bc3118ba49da28f79280e1d55603aa737 <9b1a02e0d980ac6b0e36a90378f847062f81d7e4
  5. Affected versionversion=14a4696bc3118ba49da28f79280e1d55603aa737 <b8278ff605187ef3fa0f2705e93251cce4c4f8ee
  6. Affected versionversion=14a4696bc3118ba49da28f79280e1d55603aa737 <b88a511308779c225005d7994b8744561bdbafbc
  7. Affected versionversion=14a4696bc3118ba49da28f79280e1d55603aa737 <cb6abc584a1bfab107ac003d64948a4aef1730aa
  8. Affected versionversion=22bfa94db2ef6900c790884fa9461486516626e9 <945d9894502cd9124f5d676181c542ed2000f7c0
  9. Affected versionversion=5.10.50 <5.10.261
  10. Affected versionversion=5.12.17 <5.13
  11. Affected versionversion=5.13.2 <5.14
  12. Affected versionversion=5.14
  13. Affected versionversion=80c6ddf771df2ef786f28c1ca5919b3f1080091b
  14. Affected versionversion=ebf91625b3e404bd2b4b694c7ee71c1e8f8bd08f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=14a4696bc3118ba49da28f79280e1d55603aa737 <15413a082df69175c2f96aeab4c26fe1ff7cff03; version=14a4696bc3118ba49da28f79280e1d55603aa737 <59672aa4bcd8d32172c1ff6a179583981d6acabc; version=14a4696bc3118ba49da28f79280e1d55603aa737 <6280eda96e0707264849fa7d036fed873c1f8a6d; version=14a4696bc3118ba49da28f79280e1d55603aa737 <9b1a02e0d980ac6b0e36a90378f847062f81d7e4; version=14a4696bc3118ba49da28f79280e1d55603aa737 <b8278ff605187ef3fa0f2705e93251cce4c4f8ee; version=14a4696bc3118ba49da28f79280e1d55603aa737 <b88a511308779c225005d7994b8744561bdbafbc; version=14a4696bc3118ba49da28f79280e1d55603aa737 <cb6abc584a1bfab107ac003d64948a4aef1730aa; version=22bfa94db2ef6900c790884fa9461486516626e9 <945d9894502cd9124f5d676181c542ed2000f7c0; version=5.10.50 <5.10.261; version=5.12.17 <5.13; version=5.13.2 <5.14; version=5.14; version=80c6ddf771df2ef786f28c1ca5919b3f1080091b; version=ebf91625b3e404bd2b4b694c7ee71c1e8f8bd08f

Published CVSS scores

7.8Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
CAPEC-29Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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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