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Review reviewHigh

CVE-2025-21919

Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP

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...

CVSS
7.8
EPSS
0.20%
10.4% percentile
CISA KEV
Not listed
Published
2025.04.02
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.20%
Technical severityCVSS 7.8

Vulnerability overview

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...

Affected product and versions

Product
Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
Affected versions
>= fdaba61ef8a268d4136d0a113d153f7a89eb9984 < 5cb300dcdd27e6a351ac02541e0231261c775852, >= fdaba61ef8a268d4136d0a113d153f7a89eb9984 < 000c9ee43928f2ce68a156dd40bab7616256f4dd, >= fdaba61ef8a268d4136d0a113d153f7a89eb9984 < 9cc7f0018609f75a349e42e3aebc3b0e905ba775, >= fdaba61ef8a268d4136d0a113d153f7a89eb9984 < b5741e4b9ef3567613b2351384f91d3f16e59986, >= fdaba61ef8a268d4136d0a113d153f7a89eb9984 < e1dd09df30ba86716cb2ffab97dc35195c01eb8f, >= fdaba61ef8a268d4136d0a113d153f7a89eb9984 < 3b4035ddbfc8e4521f85569998a7569668cccf51, >= 5.13, >= V3.1.6, >= 5.13 < 5.15.179, >= 5.16 < 6.1.131, >= 6.2 < 6.6.83, >= 6.7 < 6.12.19, >= 6.13 < 6.13.7, 6.14
Fixed versions
5.15.179, 6.1.131, 6.6.83, 6.12.19, 6.13.7

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-787