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.
References
Configurations
Configuration 1 (hide)
|
History
11 Apr 2025, 13:16
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.8 |
| First Time |
Linux linux Kernel
Linux |
|
| CWE | CWE-787 | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/3b4035ddbfc8e4521f85569998a7569668cccf51 - Patch | |
| References | () https://git.kernel.org/stable/c/b5741e4b9ef3567613b2351384f91d3f16e59986 - Patch | |
| References | () https://git.kernel.org/stable/c/5cb300dcdd27e6a351ac02541e0231261c775852 - Patch | |
| References | () https://git.kernel.org/stable/c/9cc7f0018609f75a349e42e3aebc3b0e905ba775 - Patch | |
| References | () https://git.kernel.org/stable/c/000c9ee43928f2ce68a156dd40bab7616256f4dd - Patch | |
| References | () https://git.kernel.org/stable/c/e1dd09df30ba86716cb2ffab97dc35195c01eb8f - Patch |
01 Apr 2025, 16:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-04-01 16:15
Updated : 2025-04-11 13:16
NVD link : CVE-2025-21919
Mitre link : CVE-2025-21919
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-787
Out-of-bounds Write