{"id":"CVE-2025-38704","title":"rcu/nocb: Fix possible invalid rdp's->nocb_cb_kthread pointer access","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nrcu/nocb: Fix possible invalid rdp's->nocb_cb_kthread pointer access\n\nIn the preparation stage of CPU online, if the corresponding\nthe rdp's->nocb_cb_kthread does not e…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < b097ae798298885695c339d390b48b4e39619fa7","Linux >= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < 3da45ec1e485a1a5ad31fe9ddd467c7ee5ae4ef9","Linux >= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < cce3d027227c69e85896af9fbc6fa9af5c68f067","Linux >= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < 1c951683a720b17c9ecaad1932bc95b29044611f","Linux >= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < 9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9d","Linux >= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < 1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1","Linux 6.0"],"published":"2025-09-04","updated":"2026-09-08","sourceUpdated":"2026-09-08T08:41:56.846Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-38704","references":[{"url":"https://git.kernel.org/stable/c/b097ae798298885695c339d390b48b4e39619fa7"},{"url":"https://git.kernel.org/stable/c/3da45ec1e485a1a5ad31fe9ddd467c7ee5ae4ef9"},{"url":"https://git.kernel.org/stable/c/cce3d027227c69e85896af9fbc6fa9af5c68f067"},{"url":"https://git.kernel.org/stable/c/1c951683a720b17c9ecaad1932bc95b29044611f"},{"url":"https://git.kernel.org/stable/c/9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9d"},{"url":"https://git.kernel.org/stable/c/1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1"}],"tags":["cve.org"],"epss":0.00166,"epssPercentile":0.06264,"ingestedAt":"2026-09-08T15:33:26.997Z","slug":"CVE-2025-38704","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nrcu/nocb: Fix possible invalid rdp's->nocb_cb_kthread pointer access\n\nIn the preparation stage of CPU online, if the corresponding\nthe rdp's->nocb_cb_kthread does not exist, will be created,\nthere is a situation where the rdp's rcuop kthreads creation fails,\nand then de-offload this CPU's rdp, does not assign this CPU's\nrdp->nocb_cb_kthread pointer, but this rdp's->nocb_gp_rdp and\nrdp's->rdp_gp->nocb_gp_kthread is still valid.\n\nThis will cause the subsequent re-offload operation of this offline\nCPU, which will pass the conditional check and the kthread_unpark()\nwill access invalid rdp's->nocb_cb_kthread pointer.\n\nThis commit therefore use rdp's->nocb_gp_kthread instead of\nrdp_gp's->nocb_gp_kthread for safety check.\n\n## Affected\n\n- `Linux >= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < b097ae798298885695c339d390b48b4e39619fa7`\n- `Linux >= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < 3da45ec1e485a1a5ad31fe9ddd467c7ee5ae4ef9`\n- `Linux >= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < cce3d027227c69e85896af9fbc6fa9af5c68f067`\n- `Linux >= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < 1c951683a720b17c9ecaad1932bc95b29044611f`\n- `Linux >= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < 9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9d`\n- `Linux >= 3a5761dc025da47960755ac64d9fbf1c32e8cd80 < 1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1`\n- `Linux 6.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}