In the Linux kernel, the following vulnerability has been resolved: rcu/nocb: Fix possible...
🔗 CVE IDs covered (1)
📋 Description
In the Linux kernel, the following vulnerability has been resolved:
rcu/nocb: Fix possible invalid rdp's->nocb_cb_kthread pointer access
In the preparation stage of CPU online, if the corresponding the rdp's->nocb_cb_kthread does not exist, will be created, there is a situation where the rdp's rcuop kthreads creation fails, and then de-offload this CPU's rdp, does not assign this CPU's rdp->nocb_cb_kthread pointer, but this rdp's->nocb_gp_rdp and rdp's->rdp_gp->nocb_gp_kthread is still valid.
This will cause the subsequent re-offload operation of this offline CPU, which will pass the conditional check and the kthread_unpark() will access invalid rdp's->nocb_cb_kthread pointer.
This commit therefore use rdp's->nocb_gp_kthread instead of rdp_gp's->nocb_gp_kthread for safety check.
🔗 References (10)
- https://nvd.nist.gov/vuln/detail/CVE-2025-38704
- https://git.kernel.org/stable/c/1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1
- https://git.kernel.org/stable/c/1c951683a720b17c9ecaad1932bc95b29044611f
- https://git.kernel.org/stable/c/9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9d
- https://git.kernel.org/stable/c/cce3d027227c69e85896af9fbc6fa9af5c68f067
- https://git.kernel.org/stable/c/3da45ec1e485a1a5ad31fe9ddd467c7ee5ae4ef9
- https://git.kernel.org/stable/c/b097ae798298885695c339d390b48b4e39619fa7
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://github.com/advisories/GHSA-8f3q-p7pf-m5wj