CVE-2026-52971 Details
Description
In the Linux kernel, the following vulnerability has been resolved: net: ena: PHC: Fix potential use-after-free in get_timestamp Move the phc->active check and resp pointer assignment to after acquiring the spinlock. Previously, phc->active was checked without holding the lock, and resp was cached from ena_dev->phc.virt_addr before the lock was acquired. If ena_com_phc_destroy() runs between the lockless active check and the lock acquisition, it sets active=false, releases the lock, frees the DMA memory, and sets virt_addr=NULL. The get_timestamp path would then read a NULL virt_addr and dereference it. With both the active check and the pointer read under the lock, destroy cannot free the memory while get_timestamp is using it.
A use-after-free vulnerability has been identified in the Linux kernel's ENA (Elastic Network Adapter) driver, specifically in the handling of Precision Time Protocol (PTP) Hardware Clock (PHC) timestamps. This issue arises because the PHC's active status is checked without holding a necessary lock, allowing a concurrent function to deactivate the PHC and free associated memory. As a result, the timestamp retrieval function may attempt to access a null pointer, leading to a potential memory access error. The vulnerability affects the Linux kernel stable tree.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been addressed. Instructions for downloading the patched version are available on the Linux Kernel Archives.
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/95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ca9ed40f28949353911dcb524ff8fff2f3409c97 | kernel.org | Patch |
| https://git.kernel.org/stable/c/e42c755582f0960e684298762f0ab927b3778376 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.17, < 6.18.33 >= 6.19, < 7.0.10 7.1 rc1 7.1 rc2 7.1 rc3 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 14, 2026 | Initial Analysis | [email protected] |
| Jun 28, 2026 | CVE Modified | kernel.org |
| Jun 24, 2026 | New CVE Received | kernel.org |