# CVE-2020-12657: perf: The kernel packages contain the Linux kernel, the core of any Linux operating system.  Security Fix(es):  * kernel: u...

CVE-2020-12657 is fixed in 47 products on 1 platform, first by RHSA-2020:2427, released June 9, 2020. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2020-12657
- Priority: High
- CVSS: 7.8 (Important)
- EPSS: 0.0071
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 9, 2020

## Description

The kernel packages contain the Linux kernel, the core of any Linux operating system.  Security Fix(es):  * kernel: use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body (CVE-2020-12657)  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):  * kernel: hw: provide reporting and microcode mitigation toggle for CVE-2020-0543 / Special Register Buffer Data Sampling (SRBDS) (BZ#1827191)  * ipsec interfaces: fix sending with bpf_redirect() / AF_PACKET sockets (BZ#1821375)  * IB/core: deadlock on rdma_nl_mutex when netlink triggers on-demand modprobe rdma_cm (BZ#1821381)  * dm: fix excessive bio splitting that results in performance regressions (BZ#1821382)  * system time jumps when hotplug vcpu on a long uptime guest (BZ#1822498)  * [DELL 8.2 BUG]Ethernet : e1000e doesn't work after S2I (BZ#1825262)  * NFSv3 sec=krb5p fails against an ONTAP server (BZ#1826219)  * Stand-alone CPU Linpack test reports bad residual on HPC Cluster node(s) while running RHEL 8 (BZ#1827619)  * [DELL 8.2 BUG]bluetooth Scanning  block S3 and  Suspend to idle (BZ#1827620)  * RHEL8.2 Beta - SMC-R connection with vlan-id fails (BZ#1827631)  * RHEL8.1 - RHEL8.1 kernel 4.18.0-147.3.1.el8.bz181950_test001.ppc64le+debug failed during LPM test (p8/p9):idahop08:LPM (vtpm) (BZ#1827632)  * missing version.h dependency for modpost may cause build to fail (BZ#1828229)  * efi: kernel panic during ltp fs test - read_all -d /sys -q -r 10 (BZ#1829527)  * Let "isolcpus=" skip unknown sub-parameters (BZ#1832367)  * RHEL8.0 - Very bad performance with small blocks in FC-IO found by SAP HANA on POWER tests on RHEL8.0 (compared to RHEL7.4) (BZ#1834517)  * [FJ8.2 Bug]: [REG] NFS-client panic at nfs4_get_valid_delegation+0x1c/0x40 [nfsv4] (BZ#1837969)  * [RHEL-8.3] upstream bonding driver refresh (BZ#1838477)  * Enable xt_u32 module (BZ#1840799)  * Move xt_u32 module to kernel-modules-extra (BZ#1840800)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | bpftool ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel-abi-whitelists RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-abi-whitelists ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel-core RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-core ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel-cross-headers ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel-debug RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-debug ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel-debug-core RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-debug-core ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel-debug-devel RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-debug-devel ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel-debug-modules RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-debug-modules ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel-debug-modules-extra RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-debug-modules-extra ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel-devel RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-devel ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel-doc RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-doc ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel-headers ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel-modules RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-modules ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel-modules-extra RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-modules-extra ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel-rt RHEL 8 | 0:4.18.0-193.6.3.rt13.59.el8_2 | [RHSA-2020:2428](https://patchblox.com/security/data/fix/linux/rhsa-2020-2428.md) | Jun 9, 2020 |
| Linux | kernel-rt-core RHEL 8 | 0:4.18.0-193.6.3.rt13.59.el8_2 | [RHSA-2020:2428](https://patchblox.com/security/data/fix/linux/rhsa-2020-2428.md) | Jun 9, 2020 |
| Linux | kernel-rt-debug RHEL 8 | 0:4.18.0-193.6.3.rt13.59.el8_2 | [RHSA-2020:2428](https://patchblox.com/security/data/fix/linux/rhsa-2020-2428.md) | Jun 9, 2020 |
| Linux | kernel-rt-debug-core RHEL 8 | 0:4.18.0-193.6.3.rt13.59.el8_2 | [RHSA-2020:2428](https://patchblox.com/security/data/fix/linux/rhsa-2020-2428.md) | Jun 9, 2020 |
| Linux | kernel-rt-debug-devel RHEL 8 | 0:4.18.0-193.6.3.rt13.59.el8_2 | [RHSA-2020:2428](https://patchblox.com/security/data/fix/linux/rhsa-2020-2428.md) | Jun 9, 2020 |
| Linux | kernel-rt-debug-kvm RHEL 8 | 0:4.18.0-193.6.3.rt13.59.el8_2 | [RHSA-2020:2428](https://patchblox.com/security/data/fix/linux/rhsa-2020-2428.md) | Jun 9, 2020 |
| Linux | kernel-rt-debug-modules RHEL 8 | 0:4.18.0-193.6.3.rt13.59.el8_2 | [RHSA-2020:2428](https://patchblox.com/security/data/fix/linux/rhsa-2020-2428.md) | Jun 9, 2020 |
| Linux | kernel-rt-debug-modules-extra RHEL 8 | 0:4.18.0-193.6.3.rt13.59.el8_2 | [RHSA-2020:2428](https://patchblox.com/security/data/fix/linux/rhsa-2020-2428.md) | Jun 9, 2020 |
| Linux | kernel-rt-devel RHEL 8 | 0:4.18.0-193.6.3.rt13.59.el8_2 | [RHSA-2020:2428](https://patchblox.com/security/data/fix/linux/rhsa-2020-2428.md) | Jun 9, 2020 |
| Linux | kernel-rt-kvm RHEL 8 | 0:4.18.0-193.6.3.rt13.59.el8_2 | [RHSA-2020:2428](https://patchblox.com/security/data/fix/linux/rhsa-2020-2428.md) | Jun 9, 2020 |
| Linux | kernel-rt-modules RHEL 8 | 0:4.18.0-193.6.3.rt13.59.el8_2 | [RHSA-2020:2428](https://patchblox.com/security/data/fix/linux/rhsa-2020-2428.md) | Jun 9, 2020 |
| Linux | kernel-rt-modules-extra RHEL 8 | 0:4.18.0-193.6.3.rt13.59.el8_2 | [RHSA-2020:2428](https://patchblox.com/security/data/fix/linux/rhsa-2020-2428.md) | Jun 9, 2020 |
| Linux | kernel-tools RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-tools ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel-tools-libs RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-tools-libs ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel-tools-libs-devel RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-tools-libs-devel ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |
| Linux | kernel-uek ol 8 | 0:5.4.17-2011.3.2.1.el8uek | [ELSA-2020-5714](https://patchblox.com/security/data/fix/linux/elsa-2020-5714.md) | Jun 9, 2020 |
| Linux | kernel-uek-debug ol 8 | 0:5.4.17-2011.3.2.1.el8uek | [ELSA-2020-5714](https://patchblox.com/security/data/fix/linux/elsa-2020-5714.md) | Jun 9, 2020 |
| Linux | kernel-uek-debug-devel ol 8 | 0:5.4.17-2011.3.2.1.el8uek | [ELSA-2020-5714](https://patchblox.com/security/data/fix/linux/elsa-2020-5714.md) | Jun 9, 2020 |
| Linux | kernel-uek-devel ol 8 | 0:5.4.17-2011.3.2.1.el8uek | [ELSA-2020-5714](https://patchblox.com/security/data/fix/linux/elsa-2020-5714.md) | Jun 9, 2020 |
| Linux | kernel-uek-doc ol 8 | 0:5.4.17-2011.3.2.1.el8uek | [ELSA-2020-5714](https://patchblox.com/security/data/fix/linux/elsa-2020-5714.md) | Jun 9, 2020 |
| Linux | kernel-uek-tools ol 8 | 0:5.4.17-2011.3.2.1.el7uek | [ELSA-2020-5714](https://patchblox.com/security/data/fix/linux/elsa-2020-5714.md) | Jun 9, 2020 |
| Linux | kernel-uek-tools-libs ol 8 | 0:5.4.17-2011.3.2.1.el7uek | [ELSA-2020-5714](https://patchblox.com/security/data/fix/linux/elsa-2020-5714.md) | Jun 9, 2020 |
| Linux | kernel-zfcpdump RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-zfcpdump-core RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-zfcpdump-devel RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-zfcpdump-modules RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kernel-zfcpdump-modules-extra RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | kpatch-patch-4_18_0-193 RHEL 8 | 0:1-3.el8 | [RHSA-2020:2567](https://patchblox.com/security/data/fix/linux/rhsa-2020-2567.md) | Jun 15, 2020 |
| Linux | kpatch-patch-4_18_0-193_1_2 RHEL 8 | 0:1-1.el8_2 | [RHSA-2020:2567](https://patchblox.com/security/data/fix/linux/rhsa-2020-2567.md) | Jun 15, 2020 |
| Linux | perf RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | perf ol 8 | 0:5.4.17-2011.3.2.1.el7uek | [ELSA-2020-5714](https://patchblox.com/security/data/fix/linux/elsa-2020-5714.md) | Jun 9, 2020 |
| Linux | python-perf ol 8 | 0:5.4.17-2011.3.2.1.el7uek | [ELSA-2020-5714](https://patchblox.com/security/data/fix/linux/elsa-2020-5714.md) | Jun 9, 2020 |
| Linux | python3-perf RHEL 8 | 0:4.18.0-193.6.3.el8_2 | [RHSA-2020:2427](https://patchblox.com/security/data/fix/linux/rhsa-2020-2427.md) | Jun 9, 2020 |
| Linux | python3-perf ol 8 | 0:4.18.0-193.6.3.el8_2 | [ELSA-2020-2427](https://patchblox.com/security/data/fix/linux/elsa-2020-2427.md) | Jun 10, 2020 |

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