# CVE-2021-37576: bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: p... CVE-2021-37576 is fixed in 30 products on 1 platform, first by RHSA-2021:3447, released September 7, 2021. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2021-37576 - Priority: High - CVSS: 7.8 (Important) - EPSS: 0.0058 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 7, 2021 ## Description The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: powerpc: KVM guest OS users can cause host OS memory corruption (CVE-2021-37576) * kernel: slab-out-of-bounds access in xdr_set_page_base() in net/sunrpc/xdr.c (CVE-2021-38201) For 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. Bug Fix(es): * Update Broadcom Emulex lpfc driver for RHEL8.5 with bug fixes (BZ#1948608) * cyclictest shows >50us latency when guest enters idle (RT guest with 18 RT vCPUs) (BZ#1981336) * xfrm: backports from upstream (BZ#1981840) * A task is stuck waiting for the completion of the vmci_resouce releasing upon the balloon reset. (BZ#1982042) * [mlx5] backport driver bits of net: zero-initialize tc skb extension on allocation (BZ#1982220) * Kernel cannot kill a process doing compaction for hugepage allocation (BZ#1984085) * RHEL8.4 Nightly[0108] - [P10] [Regression] Kdump failed on RHEL8.4 on SAN disk via flavafish adapter (qla2xxx/HPT/Radix) (BZ#1986156) * [RHEL8.5] scheduler updates and fixes (BZ#1987296) * RHEL 8.3 using FCOE via a FastLinQ QL45000 card will not manually scan in LUN from Target_id's over 8 (BZ#1989097) * fixes for oopses in security mitigation runtime code patching (BZ#1989174) * act mirred doesn't scrub packets when sending them to ingress (BZ#1992226) * HPE: Cannot install 8.4 using the DVD presented to the iLO (BZ#1993894) * NFS client hangs on share listing when server side readdir verifiers are implemented (BZ#1993895) * SNO: The load is extremely high (~870) when pao is added and a profile is applied. (BZ#1994879) * timeout value of conntrack entry with TCP ESTABLISHED status is too short (BZ#1995554) * Increase the default value for flowtable offload timeouts (BZ#1995555) * ice/iavf driver stop responding (BZ#1997534) * [FJ8.4 Bug]: [REG] Some files in /proc/sys/user show wrong data (BZ#1998002) ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | bpftool ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel-abi-stablelists RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-abi-stablelists ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel-core RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-core ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel-cross-headers ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel-debug RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-debug ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel-debug-core RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-debug-core ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel-debug-devel RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-debug-devel ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel-debug-modules RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-debug-modules ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel-debug-modules-extra RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-debug-modules-extra ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel-devel RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-devel ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel-doc RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-doc ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel-headers ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel-modules RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-modules ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel-modules-extra RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-modules-extra ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel-tools RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-tools ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel-tools-libs RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-tools-libs ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel-tools-libs-devel RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-tools-libs-devel ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | kernel-zfcpdump RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-zfcpdump-core RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-zfcpdump-devel RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-zfcpdump-modules RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kernel-zfcpdump-modules-extra RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | kpatch-patch-4_18_0-305 RHEL 8 | 0:1-5.el8 | [RHSA-2021:3436](https://patchblox.com/security/data/fix/linux/rhsa-2021-3436.md) | Sep 7, 2021 | | Linux | kpatch-patch-4_18_0-305_10_2 RHEL 8 | 0:1-2.el8_4 | [RHSA-2021:3436](https://patchblox.com/security/data/fix/linux/rhsa-2021-3436.md) | Sep 7, 2021 | | Linux | kpatch-patch-4_18_0-305_12_1 RHEL 8 | 0:1-1.el8_4 | [RHSA-2021:3436](https://patchblox.com/security/data/fix/linux/rhsa-2021-3436.md) | Sep 7, 2021 | | Linux | kpatch-patch-4_18_0-305_3_1 RHEL 8 | 0:1-4.el8_4 | [RHSA-2021:3436](https://patchblox.com/security/data/fix/linux/rhsa-2021-3436.md) | Sep 7, 2021 | | Linux | kpatch-patch-4_18_0-305_7_1 RHEL 8 | 0:1-3.el8_4 | [RHSA-2021:3436](https://patchblox.com/security/data/fix/linux/rhsa-2021-3436.md) | Sep 7, 2021 | | Linux | perf RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | perf ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | | Linux | python3-perf RHEL 8 | 0:4.18.0-305.17.1.el8_4 | [RHSA-2021:3447](https://patchblox.com/security/data/fix/linux/rhsa-2021-3447.md) | Sep 7, 2021 | | Linux | python3-perf ol 8 | 0:4.18.0-305.17.1.el8_4 | [ELSA-2021-3447](https://patchblox.com/security/data/fix/linux/elsa-2021-3447.md) | Sep 8, 2021 | --- Data as of 2026-11-08T00:53:09Z UTC. 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