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CVE-2026-64253

Severity CVSS v4.0:
Pending analysis
Type:
CWE-476 NULL Pointer Dereference
Publication date:
24/07/2026
Last modified:
17/08/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> kernel/fork: clear PF_BLOCK_TS in copy_process()<br /> <br /> PF_BLOCK_TS is only set in blk_time_get_ns() when current-&gt;plug is<br /> non-NULL, and blk_finish_plug() clears it via __blk_flush_plug()<br /> before NULLing the plug pointer. copy_process() breaks the<br /> invariant by inheriting PF_BLOCK_TS from the parent while resetting<br /> the child&amp;#39;s plug to NULL.<br /> <br /> Clear PF_BLOCK_TS alongside that assignment so callers can rely on<br /> "PF_BLOCK_TS set implies current-&gt;plug != NULL" and dereference<br /> current-&gt;plug unguarded.

Impact

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

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.9 (including) 6.12.95 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.13 (including) 6.18.38 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.19 (including) 7.1.3 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools