# CVE-2022-50630: linux: In the Linux kernel, the following vulnerability has been resolved:  mm: hugetlb: fix UAF in hugetlb_handle_userfault...

CVE-2022-50630 is fixed in 63 products on 1 platform, first by RHSA-2023:6583, released November 7, 2023. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-50630
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 7, 2023

## Description

In the Linux kernel, the following vulnerability has been resolved:  mm: hugetlb: fix UAF in hugetlb_handle_userfault  The vma_lock and hugetlb_fault_mutex are dropped before handling userfault and reacquire them again after handle_userfault(), but reacquire the vma_lock could lead to UAF[1,2] due to the following race,  hugetlb_fault   hugetlb_no_page     /*unlock vma_lock */     hugetlb_handle_userfault       handle_userfault         /* unlock mm->mmap_lock*/                                            vm_mmap_pgoff                                              do_mmap                                                mmap_region                                                  munmap_vma_range                                                    /* clean old vma */         /* lock vma_lock again  <--- UAF */     /* unlock vma_lock */  Since the vma_lock will unlock immediately after hugetlb_handle_userfault(), let's drop the unneeded lock and unlock in hugetlb_handle_userfault() to fix the issue.  [1] https://lore.kernel.org/linux-mm/000000000000d5e00a05e834962e@google.com/ [2] https://lore.kernel.org/linux-mm/20220921014457.1668-1-liuzixian4@huawei.com/

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool RHEL 9 | 0:7.2.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-64k RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-64k-core RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-64k-debug RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-64k-debug-core RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-64k-debug-devel RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-64k-debug-devel-matched RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-64k-debug-modules RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-64k-debug-modules-core RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-64k-debug-modules-extra RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-64k-devel RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-64k-devel-matched RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-64k-modules RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-64k-modules-core RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-64k-modules-extra RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-abi-stablelists RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-core RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-debug RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-debug-core RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-debug-devel RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-debug-devel-matched RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-debug-modules RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-debug-modules-core RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-debug-modules-extra RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-debug-uki-virt RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-devel RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-devel-matched RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-doc RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-modules RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-modules-core RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-modules-extra RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-rt RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-rt-core RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-rt-debug RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-rt-debug-core RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-rt-debug-devel RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-rt-debug-kvm RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-rt-debug-modules RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-rt-debug-modules-core RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-rt-debug-modules-extra RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-rt-devel RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-rt-kvm RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-rt-modules RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-rt-modules-core RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-rt-modules-extra RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-tools RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-tools-libs RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-tools-libs-devel RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-uki-virt RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-zfcpdump RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-zfcpdump-core RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-zfcpdump-devel RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-zfcpdump-devel-matched RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-zfcpdump-modules RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-zfcpdump-modules-core RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | kernel-zfcpdump-modules-extra RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | libperf RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | linux Debian 12.15 (bookworm) | 6.0.3-1 | [DEBIAN-CVE-2022-50630](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50630.md) | Dec 8, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.3-1 | [DEBIAN-CVE-2022-50630](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50630.md) | Dec 8, 2025 |
| Linux | linux Debian 14 | 6.0.3-1 | [DEBIAN-CVE-2022-50630](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50630.md) | Dec 8, 2025 |
| Linux | perf RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | python3-perf RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | rtla RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |
| Linux | rv RHEL 9 | 0:5.14.0-362.8.1.el9_3 | [RHSA-2023:6583](https://patchblox.com/security/data/fix/linux/rhsa-2023-6583.md) | Nov 7, 2023 |

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