{"id":"RLSA-2021:3440","summary":"Moderate: kernel-rt security and bug fix update","details":"The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.\n\nSecurity Fix(es):\n\n* kernel: slab-out-of-bounds access in xdr_set_page_base() in net/sunrpc/xdr.c (CVE-2021-38201)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nBug Fix(es):\n\n* OSLAT spikes on subset of cpus (BZ#1986063)\n\n* kernel-rt: update RT source tree to the Rocky Linux-8.4.z source tree (BZ#1990013)\n\n* Failure to enter full_nohz due to needless SCHED softirqs (BZ#1990272)\n\n* kernel-rt: Make rcu_normal_after_boot writable (BZ#1995431)","modified":"2026-03-11T05:59:38.397739Z","published":"2021-09-07T14:16:43Z","upstream":["CVE-2021-38201"],"references":[{"type":"ADVISORY","url":"https://errata.rockylinux.org/RLSA-2021:3440"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1992731"}],"affected":[{"package":{"name":"kernel-rt","ecosystem":"Rocky Linux:8","purl":"pkg:rpm/rocky-linux/kernel-rt?distro=rocky-linux-8-4-legacy&epoch=0"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.18.0-305.17.1.rt7.89.el8_4"}],"database_specific":{"yum_repository":"RT"}}],"database_specific":{"source":"https://storage.googleapis.com/resf-osv-data/RLSA-2021:3440.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}],"credits":[{"name":"Rocky Enterprise Software Foundation"},{"name":"Red Hat"}]}