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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2025-21919 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: sched/fair: Fix potential memory corruption in child_cfs_rq_on_list child_cfs_rq_on_list attempts to convert a 'prev' pointer to a cfs_rq. This 'prev' pointer can originate from struct rq's leaf_cfs_rq_list, making the conversion invalid and potentially leading to memory corruption. Depending on the relative positions of leaf_cfs_rq_list and the task group (tg) pointer within the struct, this can cause a memory fault or access garbage data. The issue arises in list_add_leaf_cfs_rq, where both cfs_rq->leaf_cfs_rq_list and rq->leaf_cfs_rq_list are added to the same leaf list. Also, rq->tmp_alone_branch can be set to rq->leaf_cfs_rq_list. This adds a check `if (prev == &rq->leaf_cfs_rq_list)` after the main conditional in child_cfs_rq_on_list. This ensures that the container_of operation will convert a correct cfs_rq struct. This check is sufficient because only cfs_rqs on the same CPU are added to the list, so verifying the 'prev' pointer against the current rq's list head is enough. Fixes a potential memory corruption issue that due to current struct layout might not be manifesting as a crash but could lead to unpredictable behavior when the layout changes.


Metrics

 
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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://cert-portal.siemens.com/productcert/html/ssa-019113.html siemens-SADP
https://git.kernel.org/stable/c/000c9ee43928f2ce68a156dd40bab7616256f4dd kernel.org Patch 
https://git.kernel.org/stable/c/3b4035ddbfc8e4521f85569998a7569668cccf51 kernel.org Patch 
https://git.kernel.org/stable/c/5cb300dcdd27e6a351ac02541e0231261c775852 kernel.org Patch 
https://git.kernel.org/stable/c/9cc7f0018609f75a349e42e3aebc3b0e905ba775 kernel.org Patch 
https://git.kernel.org/stable/c/b5741e4b9ef3567613b2351384f91d3f16e59986 kernel.org Patch 
https://git.kernel.org/stable/c/e1dd09df30ba86716cb2ffab97dc35195c01eb8f kernel.org Patch 
https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html CVE

Weakness Enumeration

CWE-ID CWE Name Source
CWE-787 Out-of-bounds Write cwe source acceptance level NIST   CISA-ADP  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

7 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2025-21919
NVD Published Date:
04/01/2025
NVD Last Modified:
07/14/2026
Source:
kernel.org