{"id":"CVE-2026-98972","summary":"cgroup/cpuset: Don't access cpuset_cgrp_subsys.root in is_in_v2_mode()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncgroup/cpuset: Don't access cpuset_cgrp_subsys.root in is_in_v2_mode()\n\nAfter seeing the patch [1] to guard is_in_v2_mode() with RCU, it makes\nme realize that is_in_v2_mode() may be called in a context where a new\ncgroup filesystem is being rebound with stale cpuset_cgrp_subsys.root\npointer. Avoid this potential UaF situation by adding a new cpuset_v2_mode\nflag which is set when the cpuset_v2_mode mount option is used. This\nflag is written into only when cpuset_bind() is being called with a\nstable cpuset_cgrp_subsys.root value. The is_in_v2_mode() helper is\nmodified to read the new cpuset_v2_mode flag instead of accessing\ncpuset_cgrp_subsys.root directly.\n\n[1] https://lore.kernel.org/lkml/20260929084124.626693-2-arighi@nvidia.com","modified":"2026-10-25T02:47:29.794916368Z","published":"2026-10-23T12:19:45.458Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98972.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/988bf67a13890a37a33201f95947095ca9bec856"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e06b678e3b4e12fdaa0b51a7a5a54abc5dbd6469"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98972.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98972"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b8d1b8ee93df8ffbabbeadd65d39853cfad6d698"},{"fixed":"988bf67a13890a37a33201f95947095ca9bec856"},{"fixed":"e06b678e3b4e12fdaa0b51a7a5a54abc5dbd6469"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-98972.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.14.0"},{"fixed":"7.2.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-98972.json"}}],"schema_version":"1.9.2"}