CVE-2026-43447 Details
Description
In the Linux kernel, the following vulnerability has been resolved: iavf: fix PTP use-after-free during reset Commit 7c01dbfc8a1c5f ("iavf: periodically cache PHC time") introduced a worker to cache PHC time, but failed to stop it during reset or disable. This creates a race condition where `iavf_reset_task()` or `iavf_disable_vf()` free adapter resources (AQ) while the worker is still running. If the worker triggers `iavf_queue_ptp_cmd()` during teardown, it accesses freed memory/locks, leading to a crash. Fix this by calling `iavf_ptp_release()` before tearing down the adapter. This ensures `ptp_clock_unregister()` synchronously cancels the worker and cleans up the chardev before the backing resources are destroyed.
A use-after-free vulnerability has been identified in the Linux kernel's iavf driver, specifically in versions prior to the patch. This vulnerability arises from a race condition created when a worker tasked with caching PTP (Precision Time Protocol) time is not properly halted during the reset or disable processes. As a result, the worker may attempt to access freed memory or locks, leading to a crash. The issue occurs when the worker triggers a PTP command during the teardown of the adapter, accessing resources that have already been released. The vulnerability has been addressed by ensuring that the PTP release function is called before the adapter is torn down, allowing for a proper cleanup of resources and preventing the worker from accessing freed memory.
Users can apply the latest patch available in the Linux kernel stable tree to address this vulnerability. The patch can be downloaded from the Linux kernel Git repository.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/1b034f2429ce6b45ce74dc266175d277acafc5c4 | kernel.org | Patch |
| https://git.kernel.org/stable/c/90cc8b2add29b57288025b51c70bc647e7cccb12 | kernel.org | Patch |
| https://git.kernel.org/stable/c/efc54fb13d79117a825fef17364315a58682c7ec | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.15, < 6.18.19 >= 6.19, < 6.19.9 7.0 rc1 7.0 rc2 7.0 rc3 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 21, 2026 | Initial Analysis | [email protected] |
| May 11, 2026 | CVE Modified | kernel.org |
| May 8, 2026 | New CVE Received | kernel.org |