CVE-2025-21919

Advisory lineage Upstream: 0 Downstream: 53
Modified
Published: 01 Apr 2025, 15:40
Last modified:11 May 2026, 21:09

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (cve.org)
EPSS Score
0.01% LOW
0% probability -0.06%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

01 Apr 2025, 15:40
Published
Vulnerability first disclosed
11 May 2026, 21:09
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.01%• Percentile: 3%

Techniques & Countermeasures

  • CWE-787•Out-of-bounds Write

    The product writes data past the end, or before the beginning, of the intended buffer.

Affected Systems

  • linux•linux

    ≥ fdaba61ef8a268d4136d0a113d153f7a89eb9984, < 5cb300dcdd27e6a351ac02541e0231261c775852 | ≥ fdaba61ef8a268d4136d0a113d153f7a89eb9984, < 000c9ee43928f2ce68a156dd40bab7616256f4dd | ≥ fdaba61ef8a268d4136d0a113d153f7a89eb9984, < 9cc7f0018609f75a349e42e3aebc3b0e905ba775 | ≥ fdaba61ef8a268d4136d0a113d153f7a89eb9984, < b5741e4b9ef3567613b2351384f91d3f16e59986 | ≥ fdaba61ef8a268d4136d0a113d153f7a89eb9984, < e1dd09df30ba86716cb2ffab97dc35195c01eb8f | ≥ fdaba61ef8a268d4136d0a113d153f7a89eb9984, < 3b4035ddbfc8e4521f85569998a7569668cccf51 | 5.13

  • linux•linux_kernel

    ≥ 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:rc1 | 6.14:rc2 | 6.14:rc3 | 6.14:rc4 | 6.14:rc5

References (7)