# CVE-2022-49930: linux: In the Linux kernel, the following vulnerability has been resolved:  RDMA/hns: Fix NULL pointer problem in free_mr_in...

CVE-2022-49930 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49930, released May 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49930
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  RDMA/hns: Fix NULL pointer problem in free_mr_init()  Lock grab occurs in a concurrent scenario, resulting in stepping on a NULL pointer.  It should be init mutex_init() first before use the lock.    Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000   Call trace:    __mutex_lock.constprop.0+0xd0/0x5c0    __mutex_lock_slowpath+0x1c/0x2c    mutex_lock+0x44/0x50    free_mr_send_cmd_to_hw+0x7c/0x1c0 [hns_roce_hw_v2]    hns_roce_v2_dereg_mr+0x30/0x40 [hns_roce_hw_v2]    hns_roce_dereg_mr+0x4c/0x130 [hns_roce_hw_v2]    ib_dereg_mr_user+0x54/0x124    uverbs_free_mr+0x24/0x30    destroy_hw_idr_uobject+0x38/0x74    uverbs_destroy_uobject+0x48/0x1c4    uobj_destroy+0x74/0xcc    ib_uverbs_cmd_verbs+0x368/0xbb0    ib_uverbs_ioctl+0xec/0x1a4    __arm64_sys_ioctl+0xb4/0x100    invoke_syscall+0x50/0x120    el0_svc_common.constprop.0+0x58/0x190    do_el0_svc+0x30/0x90    el0_svc+0x2c/0xb4    el0t_64_sync_handler+0x1a4/0x1b0    el0t_64_sync+0x19c/0x1a0

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.8-1 | [DEBIAN-CVE-2022-49930](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49930.md) | May 1, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.8-1 | [DEBIAN-CVE-2022-49930](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49930.md) | May 1, 2025 |
| Linux | linux Debian 14 | 6.0.8-1 | [DEBIAN-CVE-2022-49930](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49930.md) | May 1, 2025 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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