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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
fdaba61ef8a268d4136d0a113d153f7a89eb9984 to < 5cb300dcdd27e6a351ac02541e0231261c775852affectedfdaba61ef8a268d4136d0a113d153f7a89eb9984 to < 000c9ee43928f2ce68a156dd40bab7616256f4ddaffectedfdaba61ef8a268d4136d0a113d153f7a89eb9984 to < 9cc7f0018609f75a349e42e3aebc3b0e905ba775affectedfdaba61ef8a268d4136d0a113d153f7a89eb9984 to < b5741e4b9ef3567613b2351384f91d3f16e59986affectedfdaba61ef8a268d4136d0a113d153f7a89eb9984 to < e1dd09df30ba86716cb2ffab97dc35195c01eb8faffectedfdaba61ef8a268d4136d0a113d153f7a89eb9984 to < 3b4035ddbfc8e4521f85569998a7569668cccf51affected
Linux Linux
Default version status: affected
5.13affected0 to < 5.13unaffected5.15.179 to ≤ 5.15.*unaffected6.1.131 to ≤ 6.1.*unaffected6.6.83 to ≤ 6.6.*unaffected6.12.19 to ≤ 6.12.*unaffected6.13.7 to ≤ 6.13.*unaffected6.14 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/5cb300dcdd27e6a351ac02541e0231261c775852 ↗
- https://git.kernel.org/stable/c/000c9ee43928f2ce68a156dd40bab7616256f4dd ↗
- https://git.kernel.org/stable/c/9cc7f0018609f75a349e42e3aebc3b0e905ba775 ↗
- https://git.kernel.org/stable/c/b5741e4b9ef3567613b2351384f91d3f16e59986 ↗
- https://git.kernel.org/stable/c/e1dd09df30ba86716cb2ffab97dc35195c01eb8f ↗
- https://git.kernel.org/stable/c/3b4035ddbfc8e4521f85569998a7569668cccf51 ↗
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html ↗