EUVD-2026-64374
GHSA-x3hg-mqqh-m29v
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Race condition timing requires AC:H; triggering driver unload requires CAP_SYS_MODULE, so PR:H; kernel UAF yields full CIA:H.
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
5DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
watchdog: at91sam9_wdt: prevent timer rearm during teardown
at91_ping() rearms the watchdog timer from its callback. timer_delete() neither waits for a running callback nor prevents it from rearming the timer, so probe failure or driver removal can leave the timer accessing the devm-allocated at91wdt after it has been freed.
Use timer_shutdown_sync() on both teardown paths. It waits for a running callback and rejects any attempt by the callback to rearm the timer.
AnalysisAI
Use-after-free race condition in the Linux kernel at91sam9_wdt watchdog driver allows a local attacker with low privileges on affected AT91 SAM9 SoC hardware to corrupt freed memory, potentially achieving kernel-level code execution. The flaw arises because at91_ping() rearms a kernel timer from within its own callback, while timer_delete() neither waits for an in-flight callback to finish nor prevents rearming - leaving a window during probe failure or driver removal where the timer accesses devm-allocated memory that has already been freed. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires physical or logical access to a Linux system running on AT91 SAM9 SoC hardware with the at91sam9_wdt watchdog driver loaded - this driver is not present or active on any other hardware platform. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) rates this as High severity, reflecting the full CIA impact achievable from a kernel use-after-free. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with local access on an embedded Linux system based on an Atmel/Microchip AT91 SAM9 SoC - such as an industrial controller or IoT gateway - triggers watchdog driver removal (e.g., via rmmod at91sam9_wdt on a system where this is permitted, or by inducing probe failure at boot). If the at91_ping() timer callback fires in the narrow window between devm memory release and timer cancellation, the callback writes into freed memory, potentially corrupting kernel heap structures. … |
| Remediation | The primary fix is to upgrade to a patched Linux kernel stable release: 6.18.45 or later on the 6.18.x branch, 7.1.9 or later on the 7.1.x branch, or 7.2 (mainline). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, verify whether your organization uses AT91 SAM9 SoC hardware by querying hardware inventory and consulting infrastructure teams. …
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