# CVE-2021-31829: kernel-rt: kernel: protection of stack pointer against speculative pointer arithmetic can be bypassed to leak content of kernel...

CVE-2021-31829 is fixed in 47 products on 1 platform, first by ELSA-2021-9362, released July 16, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-31829
- Priority: Routine
- CVSS: 6.2 (Moderate)
- EPSS: 0.0031
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 16, 2021

## Description

kernel: protection of stack pointer against speculative pointer arithmetic can be bypassed to leak content of kernel memory

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | bpftool ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel-abi-stablelists RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-abi-stablelists ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel-core RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-core ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel-cross-headers ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel-debug RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-debug ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel-debug-core RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-debug-core ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel-debug-devel RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-debug-devel ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel-debug-modules RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-debug-modules ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel-debug-modules-extra RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-debug-modules-extra ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel-devel RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-devel ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel-doc RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-doc ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel-headers ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel-modules RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-modules ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel-modules-extra RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-modules-extra ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel-rt RHEL 8 | 0:4.18.0-348.rt7.130.el8 | [RHSA-2021:4140](https://patchblox.com/security/data/fix/linux/rhsa-2021-4140.md) | Nov 9, 2021 |
| Linux | kernel-rt-core RHEL 8 | 0:4.18.0-348.rt7.130.el8 | [RHSA-2021:4140](https://patchblox.com/security/data/fix/linux/rhsa-2021-4140.md) | Nov 9, 2021 |
| Linux | kernel-rt-debug RHEL 8 | 0:4.18.0-348.rt7.130.el8 | [RHSA-2021:4140](https://patchblox.com/security/data/fix/linux/rhsa-2021-4140.md) | Nov 9, 2021 |
| Linux | kernel-rt-debug-core RHEL 8 | 0:4.18.0-348.rt7.130.el8 | [RHSA-2021:4140](https://patchblox.com/security/data/fix/linux/rhsa-2021-4140.md) | Nov 9, 2021 |
| Linux | kernel-rt-debug-devel RHEL 8 | 0:4.18.0-348.rt7.130.el8 | [RHSA-2021:4140](https://patchblox.com/security/data/fix/linux/rhsa-2021-4140.md) | Nov 9, 2021 |
| Linux | kernel-rt-debug-kvm RHEL 8 | 0:4.18.0-348.rt7.130.el8 | [RHSA-2021:4140](https://patchblox.com/security/data/fix/linux/rhsa-2021-4140.md) | Nov 9, 2021 |
| Linux | kernel-rt-debug-modules RHEL 8 | 0:4.18.0-348.rt7.130.el8 | [RHSA-2021:4140](https://patchblox.com/security/data/fix/linux/rhsa-2021-4140.md) | Nov 9, 2021 |
| Linux | kernel-rt-debug-modules-extra RHEL 8 | 0:4.18.0-348.rt7.130.el8 | [RHSA-2021:4140](https://patchblox.com/security/data/fix/linux/rhsa-2021-4140.md) | Nov 9, 2021 |
| Linux | kernel-rt-devel RHEL 8 | 0:4.18.0-348.rt7.130.el8 | [RHSA-2021:4140](https://patchblox.com/security/data/fix/linux/rhsa-2021-4140.md) | Nov 9, 2021 |
| Linux | kernel-rt-kvm RHEL 8 | 0:4.18.0-348.rt7.130.el8 | [RHSA-2021:4140](https://patchblox.com/security/data/fix/linux/rhsa-2021-4140.md) | Nov 9, 2021 |
| Linux | kernel-rt-modules RHEL 8 | 0:4.18.0-348.rt7.130.el8 | [RHSA-2021:4140](https://patchblox.com/security/data/fix/linux/rhsa-2021-4140.md) | Nov 9, 2021 |
| Linux | kernel-rt-modules-extra RHEL 8 | 0:4.18.0-348.rt7.130.el8 | [RHSA-2021:4140](https://patchblox.com/security/data/fix/linux/rhsa-2021-4140.md) | Nov 9, 2021 |
| Linux | kernel-tools RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-tools ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel-tools-libs RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-tools-libs ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel-tools-libs-devel RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-tools-libs-devel ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | kernel-uek ol 8 | 0:5.4.17-2102.203.5.el8uek | [ELSA-2021-9362](https://patchblox.com/security/data/fix/linux/elsa-2021-9362.md) | Jul 16, 2021 |
| Linux | kernel-uek-container ol 8 | 0:5.4.17-2102.203.5.el8 | [ELSA-2021-9363](https://patchblox.com/security/data/fix/linux/elsa-2021-9363.md) | Jul 16, 2021 |
| Linux | kernel-uek-container-debug ol 8 | 0:5.4.17-2102.203.5.el8 | [ELSA-2021-9363](https://patchblox.com/security/data/fix/linux/elsa-2021-9363.md) | Jul 16, 2021 |
| Linux | kernel-uek-debug ol 8 | 0:5.4.17-2102.203.5.el8uek | [ELSA-2021-9362](https://patchblox.com/security/data/fix/linux/elsa-2021-9362.md) | Jul 16, 2021 |
| Linux | kernel-uek-debug-devel ol 8 | 0:5.4.17-2102.203.5.el8uek | [ELSA-2021-9362](https://patchblox.com/security/data/fix/linux/elsa-2021-9362.md) | Jul 16, 2021 |
| Linux | kernel-uek-devel ol 8 | 0:5.4.17-2102.203.5.el8uek | [ELSA-2021-9362](https://patchblox.com/security/data/fix/linux/elsa-2021-9362.md) | Jul 16, 2021 |
| Linux | kernel-uek-doc ol 8 | 0:5.4.17-2102.203.5.el8uek | [ELSA-2021-9362](https://patchblox.com/security/data/fix/linux/elsa-2021-9362.md) | Jul 16, 2021 |
| Linux | kernel-uek-tools ol 8 | 0:5.4.17-2102.203.5.el7uek | [ELSA-2021-9362](https://patchblox.com/security/data/fix/linux/elsa-2021-9362.md) | Jul 16, 2021 |
| Linux | kernel-uek-tools-libs ol 8 | 0:5.4.17-2102.203.5.el7uek | [ELSA-2021-9362](https://patchblox.com/security/data/fix/linux/elsa-2021-9362.md) | Jul 16, 2021 |
| Linux | kernel-zfcpdump RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-zfcpdump-core RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-zfcpdump-devel RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-zfcpdump-modules RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | kernel-zfcpdump-modules-extra RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | perf RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | perf ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |
| Linux | python-perf ol 8 | 0:5.4.17-2102.203.5.el7uek | [ELSA-2021-9362](https://patchblox.com/security/data/fix/linux/elsa-2021-9362.md) | Jul 16, 2021 |
| Linux | python3-perf RHEL 8 | 0:4.18.0-348.el8 | [RHSA-2021:4356](https://patchblox.com/security/data/fix/linux/rhsa-2021-4356.md) | Nov 9, 2021 |
| Linux | python3-perf ol 8 | 0:4.18.0-348.el8 | [ELSA-2021-4356](https://patchblox.com/security/data/fix/linux/elsa-2021-4356.md) | Nov 16, 2021 |

---

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