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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
e0ea34158ee8c4f7536cd781010339ff28c0d24c affected < bddf59818ae5102e6d82a4dae5add6df8da38fb0
e0ea34158ee8c4f7536cd781010339ff28c0d24c affected < edcb049d836e175e7b3d5e0d05657104545b5e65
e0ea34158ee8c4f7536cd781010339ff28c0d24c affected < 24a08d7d6218d60c033015cf4870b6096446e734
Linux Linux affected
Version Status Constraints
6.17 affected —
0 unaffected < 6.17
6.18.33 unaffected ≤ 6.18.*
7.0.10 unaffected ≤ 7.0.*
7.1 unaffected ≤ *

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References
Link Providers
https://git.kernel.org/stable/c/24a08d7d6218d60c033015cf4870b6096446e734 cve-icon
https://git.kernel.org/stable/c/bddf59818ae5102e6d82a4dae5add6df8da38fb0 cve-icon
https://git.kernel.org/stable/c/edcb049d836e175e7b3d5e0d05657104545b5e65 cve-icon
History

Sun, 19 Jul 2026 14:45:00 +0000

Type Values Removed Values Added
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.
Title net: ena: PHC: Check return code before setting timestamp output
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-07-19T14:04:33.781Z

Reserved: 2026-07-19T07:54:57.015Z

Link: CVE-2026-63837

cve-icon Vulnrichment

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cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses

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