{"id":"CVE-2025-38704","title":"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…","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":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel < 6.12.43","linux_kernel >= 6.13, < 6.15.11","linux_kernel >= 6.16, < 6.16.2"],"patched":["linux_kernel 6.16.2"],"published":"2025-09-04","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:17:57.020","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-38704","references":[{"url":"https://git.kernel.org/stable/c/1bba3900ca18bdae28d1b9fa10f16a8f8cb2ada1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1c951683a720b17c9ecaad1932bc95b29044611f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3da45ec1e485a1a5ad31fe9ddd467c7ee5ae4ef9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9b5ec8e6b31755288a07b3abeeab8cd38e9d3c9d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b097ae798298885695c339d390b48b4e39619fa7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cce3d027227c69e85896af9fbc6fa9af5c68f067","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00182,"epssPercentile":0.07722,"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_kernel < 6.12.43`\n- `linux_kernel >= 6.13, < 6.15.11`\n- `linux_kernel >= 6.16, < 6.16.2`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.16.2`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":221527,"id":"CVE-2025-38704","ts":1792035254340,"field":"cvss","old":null,"new":"7.8"},{"seq":221526,"id":"CVE-2025-38704","ts":1792035254340,"field":"severity","old":"none","new":"high"}]}