CVE-2022-49930: RDMA/hns: Fix NULL pointer problem in free_mr_init()
First published: Thu May 01 2025(Updated: )
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
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2022-49930?
CVE-2022-49930 has a medium severity level due to the potential for denial of service caused by the NULL pointer dereference in the Linux kernel.
How do I fix CVE-2022-49930?
To fix CVE-2022-49930, ensure that you update your Linux kernel to the latest patched version that addresses this vulnerability.
What systems are affected by CVE-2022-49930?
CVE-2022-49930 affects various versions of the Linux kernel that utilize the RDMA/hns component.
What type of vulnerability is CVE-2022-49930?
CVE-2022-49930 is a concurrency-related vulnerability resulting from a NULL pointer dereference during lock grabbing.
Are there any workarounds for CVE-2022-49930?
While upgrading the kernel is the primary solution, limiting access to the affected RDMA functionalities can serve as a temporary workaround.
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