CVE-2025-21919
- Source
- https://cve.org/CVERecord?id=CVE-2025-21919
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21919.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2025-21919
- Downstream
- Related
- Published
- 2025-04-01T15:40:54.075Z
- Modified
- 2026-05-07T04:18:22.794794Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- sched/fair: Fix potential memory corruption in child_cfs_rq_on_list
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
sched/fair: Fix potential memory corruption in childcfsrqonlist
childcfsrqonlist attempts to convert a 'prev' pointer to a cfsrq. This 'prev' pointer can originate from struct rq's leafcfsrqlist, making the conversion invalid and potentially leading to memory corruption. Depending on the relative positions of leafcfsrq_list and the task group (tg) pointer within the struct, this can cause a memory fault or access garbage data.
The issue arises in listaddleafcfsrq, where both cfsrq->leafcfsrqlist and rq->leafcfsrqlist are added to the same leaf list. Also, rq->tmpalonebranch can be set to rq->leafcfsrqlist.
This adds a check
if (prev == &rq->leaf_cfs_rq_list)after the main conditional in childcfsrqonlist. This ensures that the containerof operation will convert a correct cfsrq 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.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21919.json", "cna_assigner": "Linux" }- References
-
- https://git.kernel.org/stable/c/000c9ee43928f2ce68a156dd40bab7616256f4dd
- https://git.kernel.org/stable/c/3b4035ddbfc8e4521f85569998a7569668cccf51
- https://git.kernel.org/stable/c/5cb300dcdd27e6a351ac02541e0231261c775852
- https://git.kernel.org/stable/c/9cc7f0018609f75a349e42e3aebc3b0e905ba775
- https://git.kernel.org/stable/c/b5741e4b9ef3567613b2351384f91d3f16e59986
- https://git.kernel.org/stable/c/e1dd09df30ba86716cb2ffab97dc35195c01eb8f
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21919.json
- https://nvd.nist.gov/vuln/detail/CVE-2025-21919
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedfdaba61ef8a268d4136d0a113d153f7a89eb9984Fixed5cb300dcdd27e6a351ac02541e0231261c775852Fixed000c9ee43928f2ce68a156dd40bab7616256f4ddFixed9cc7f0018609f75a349e42e3aebc3b0e905ba775Fixedb5741e4b9ef3567613b2351384f91d3f16e59986Fixede1dd09df30ba86716cb2ffab97dc35195c01eb8fFixed3b4035ddbfc8e4521f85569998a7569668cccf51