CVE-2026-64253 Details
Description
In the Linux kernel, the following vulnerability has been resolved: kernel/fork: clear PF_BLOCK_TS in copy_process() PF_BLOCK_TS is only set in blk_time_get_ns() when current->plug is non-NULL, and blk_finish_plug() clears it via __blk_flush_plug() before NULLing the plug pointer. copy_process() breaks the invariant by inheriting PF_BLOCK_TS from the parent while resetting the child's plug to NULL. Clear PF_BLOCK_TS alongside that assignment so callers can rely on "PF_BLOCK_TS set implies current->plug != NULL" and dereference current->plug unguarded.
A vulnerability in the Linux kernel's process copying function, copy_process(), has been addressed. The issue arises because the function incorrectly inherits the PF_BLOCK_TS flag from the parent process while resetting the child's plug pointer to NULL. This creates a mismatch, as PF_BLOCK_TS should only be set when the plug pointer is non-NULL. The vulnerability could lead to improper handling of process scheduling and blocking, potentially allowing for unintended behavior in block device operations.
The vulnerability has been fixed in the Linux kernel. Users should upgrade to the latest version of the stable Linux kernel where this issue has been addressed.
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/77bba61a20f1b3d206f4f90e10a7bb3cd90b9619 | kernel.org | Patch |
| https://git.kernel.org/stable/c/99e6c712cc300883b8cbf03347d5359ec1a4d6dd | kernel.org | Patch |
| https://git.kernel.org/stable/c/ee0801aceabdf583392477baf69a290b09448b8f | kernel.org | Patch |
| https://git.kernel.org/stable/c/fd38b75c4b43295b10d69772a46d1c74dbd6fc81 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.9, < 6.12.95 >= 6.13, < 6.18.38 >= 6.19, < 7.1.3 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 17, 2026 | CVE Modified | kernel.org |
| Aug 12, 2026 | Initial Analysis | [email protected] |
| Jul 24, 2026 | New CVE Received | kernel.org |