Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2026-63800

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
19/07/2026
Last modified:
20/07/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> pNFS: Fix use-after-free in pnfs_update_layout()<br /> <br /> When hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(),<br /> the code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds,<br /> pnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(),<br /> which still references &amp;#39;lo&amp;#39;. This results in a use-after-free when the<br /> tracepoint accesses lo&amp;#39;s fields.<br /> <br /> Fix this by moving the tracepoint call before pnfs_put_layout_hdr(lo).

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 9.80 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
9.80
Severity 3.x
CRITICAL

References to Advisories, Solutions, and Tools