CVE-2026-63837 Details
Description
In the Linux kernel, the following vulnerability has been resolved: net: ena: PHC: Check return code before setting timestamp output ena_phc_gettimex64() is setting the output parameter regardless of whether ena_com_phc_get_timestamp() succeeded or failed. When ena_com_phc_get_timestamp() returns an error, the timestamp parameter may contain uninitialized stack memory (e.g., when PHC is disabled or in blocked state) or invalid hardware values. Passing these to userspace via the PTP ioctl is both a security issue (information leak) and a correctness bug. Fix by checking the return code after releasing the lock and only setting the output timestamp on success.
A vulnerability in the Linux kernel's ENA (Elastic Network Adapter) driver can lead to an information leak. The issue arises in the PHC (Precision Time Protocol Hardware Clock) support implementation. The function 'ena_phc_gettimex64()' improperly sets the output timestamp parameter without verifying if the preceding timestamp retrieval function succeeded. This oversight can result in the output containing uninitialized memory or invalid hardware values. When these erroneous timestamps are conveyed to userspace through the PTP ioctl, it creates a security risk by leaking sensitive information and introduces a correctness bug. 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. The specific commit that resolves this issue is '24a08d7d6218d60c033015cf4870b6096446e734', which is included in the official Linux kernel repositories.
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 CVSS 3.x data is available for this CVE.
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
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Weakness Enumeration
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Affected Products
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Change History
1 change record found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 19, 2026 | New CVE Received | kernel.org |