CVE-2026-74725
enic: fix tx_hang_reset use-after-free on device removal
Description
In the Linux kernel, the following vulnerability has been resolved: enic: fix tx_hang_reset use-after-free on device removal enic_remove() cancels the reset and change_mtu_work items but does not cancel tx_hang_reset. A TX timeout that fires while the device is being removed can schedule enic_tx_hang_reset() so that it runs after free_netdev(), resulting in a use-after-free. cancel_work_sync() alone is not sufficient here: the still-live watchdog and notify paths can re-schedule these work items in the window between the cancel and unregister_netdev(). Use disable_work_sync(), which cancels the work and blocks any subsequent schedule_work() from requeuing it, and apply it to the reset and change_mtu_work items as well so the same requeue race is closed for all teardown work.
INFO
Published Date :
Aug. 22, 2026, 4:16 p.m.
Last Modified :
Oct. 16, 2026, 8:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Use disable_work_sync for all teardown work items.
- Cancel watchdog and notify paths.
- Ensure work items are not rescheduled.
- Apply fix to reset and change_mtu_work items.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-74725.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74725 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-74725
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2026-74725 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74725 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 16, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/4f3464fc6c1f26afc504fd525c574f2bc14c9d42 Added Reference https://git.kernel.org/stable/c/8619865f34fb3b130b567855382a5c4aadd522b9 Added Reference https://git.kernel.org/stable/c/e506e704b74748ffd0e1c92a7453ca2a959f832b Added Reference https://git.kernel.org/stable/c/ec680ea4ba1bca92a767fb7e7869758bfdd886e3 Removed Reference https://git.kernel.org/stable/c/4f3464fc6c1f26afc504fd525c574f2bc14c9d42 Removed Reference https://git.kernel.org/stable/c/8619865f34fb3b130b567855382a5c4aadd522b9 Removed Reference https://git.kernel.org/stable/c/e506e704b74748ffd0e1c92a7453ca2a959f832b Removed Reference https://git.kernel.org/stable/c/ec680ea4ba1bca92a767fb7e7869758bfdd886e3 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 16, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-74725', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-10-16T19:15:41.206988Z'} -
CVE Translated by [email protected]
Oct. 14, 2026
Action Type Old Value New Value Added Translation Title: Linux, Description: En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: enic: corrige el uso después de liberación de tx_hang_reset al retirar el dispositivo enic_remove() cancela los elementos de trabajo reset y change_mtu_work pero no cancela tx_hang_reset. Un tiempo de espera de TX que se activa mientras se retira el dispositivo puede programar enic_tx_hang_reset() para que se ejecute después de free_netdev(), lo que resulta en un uso después de liberación. cancel_work_sync() por sí solo no es suficiente aquí: las rutas de watchdog y notify aún activas pueden reprogramar estos elementos de trabajo en la ventana entre la cancelación y unregister_netdev(). Utilice disable_work_sync(), que cancela el trabajo y bloquea cualquier schedule_work() posterior de volver a encolarlo, y aplíquelo también a los elementos de trabajo reset y change_mtu_work para que la misma condición de carrera de reencolado se cierre para todo el trabajo de desmontaje. -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 25, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 22, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '937317c7c1097aa878a5000e3aab616eb5c590c0', 'lessThan': '8619865f34fb3b130b567855382a5c4aadd522b9', 'versionType': 'git'}, {'status': 'affected', 'version': '937317c7c1097aa878a5000e3aab616eb5c590c0', 'lessThan': 'e506e704b74748ffd0e1c92a7453ca2a959f832b', 'versionType': 'git'}, {'status': 'affected', 'version': '937317c7c1097aa878a5000e3aab616eb5c590c0', 'lessThan': '4f3464fc6c1f26afc504fd525c574f2bc14c9d42', 'versionType': 'git'}, {'status': 'affected', 'version': '937317c7c1097aa878a5000e3aab616eb5c590c0', 'lessThan': 'ec680ea4ba1bca92a767fb7e7869758bfdd886e3', 'versionType': 'git'}], 'programFiles': ['drivers/net/ethernet/cisco/enic/enic_main.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.4'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.4', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.104', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.45', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.9', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/ethernet/cisco/enic/enic_main.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: enic: fix tx_hang_reset use-after-free on device removal enic_remove() cancels the reset and change_mtu_work items but does not cancel tx_hang_reset. A TX timeout that fires while the device is being removed can schedule enic_tx_hang_reset() so that it runs after free_netdev(), resulting in a use-after-free. cancel_work_sync() alone is not sufficient here: the still-live watchdog and notify paths can re-schedule these work items in the window between the cancel and unregister_netdev(). Use disable_work_sync(), which cancels the work and blocks any subsequent schedule_work() from requeuing it, and apply it to the reset and change_mtu_work items as well so the same requeue race is closed for all teardown work. Added Reference https://git.kernel.org/stable/c/4f3464fc6c1f26afc504fd525c574f2bc14c9d42 Added Reference https://git.kernel.org/stable/c/8619865f34fb3b130b567855382a5c4aadd522b9 Added Reference https://git.kernel.org/stable/c/e506e704b74748ffd0e1c92a7453ca2a959f832b Added Reference https://git.kernel.org/stable/c/ec680ea4ba1bca92a767fb7e7869758bfdd886e3