# CVE-2021-47088: linux: In the Linux kernel, the following vulnerability has been resolved:  mm/damon/dbgfs: protect targets destructions wit...

CVE-2021-47088 is fixed in 27 products on 1 platform, first by RHSA-2022:7683, released November 8, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-47088
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 8, 2022

## Description

In the Linux kernel, the following vulnerability has been resolved:  mm/damon/dbgfs: protect targets destructions with kdamond_lock  DAMON debugfs interface iterates current monitoring targets in 'dbgfs_target_ids_read()' while holding the corresponding 'kdamond_lock'.  However, it also destructs the monitoring targets in 'dbgfs_before_terminate()' without holding the lock.  This can result in a use_after_free bug.  This commit avoids the race by protecting the destruction with the corresponding 'kdamond_lock'.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | bpftool RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-abi-stablelists RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-abi-stablelists RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-core RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-core RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-debug RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-debug RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-debug-core RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-debug-core RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-debug-devel RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-debug-devel RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-debug-devel-matched RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-debug-modules RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-debug-modules RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-debug-modules-extra RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-debug-modules-extra RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-devel RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-devel RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-devel-matched RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-doc RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-doc RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-modules RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-modules RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-modules-extra RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-modules-extra RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-tools RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-tools RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-tools-libs RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-tools-libs RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-tools-libs-devel RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-tools-libs-devel RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-zfcpdump RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-zfcpdump RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-zfcpdump-core RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-zfcpdump-core RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-zfcpdump-devel RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-zfcpdump-devel RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-zfcpdump-devel-matched RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-zfcpdump-modules RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-zfcpdump-modules RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | kernel-zfcpdump-modules-extra RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | kernel-zfcpdump-modules-extra RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | linux Debian 12.15 (bookworm) | 5.15.15-1 | [DEBIAN-CVE-2021-47088](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47088.md) | Mar 4, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.15.15-1 | [DEBIAN-CVE-2021-47088](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47088.md) | Mar 4, 2024 |
| Linux | linux Debian 14 | 5.15.15-1 | [DEBIAN-CVE-2021-47088](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47088.md) | Mar 4, 2024 |
| Linux | perf RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | perf RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |
| Linux | python3-perf RHEL 8 | 0:4.18.0-425.3.1.el8 | [RHSA-2022:7683](https://patchblox.com/security/data/fix/linux/rhsa-2022-7683.md) | Nov 8, 2022 |
| Linux | python3-perf RHEL 9 | 0:5.14.0-162.6.1.el9_1 | [RHSA-2022:8267](https://patchblox.com/security/data/fix/linux/rhsa-2022-8267.md) | Nov 15, 2022 |

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