CVE-2023-54318 (GCVE-0-2023-54318)
Vulnerability from cvelistv5
Published
2025-12-30 12:23
Modified
2026-10-15 21:41
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/smc: use smc_lgr_list.lock to protect smc_lgr_list.list iterate in smcr_port_add While doing smcr_port_add, there maybe linkgroup add into or delete from smc_lgr_list.list at the same time, which may result kernel crash. So, use smc_lgr_list.lock to protect smc_lgr_list.list iterate in smcr_port_add. The crash calltrace show below: BUG: kernel NULL pointer dereference, address: 0000000000000000 PGD 0 P4D 0 Oops: 0000 [#1] SMP NOPTI CPU: 0 PID: 559726 Comm: kworker/0:92 Kdump: loaded Tainted: G Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 449e491 04/01/2014 Workqueue: events smc_ib_port_event_work [smc] RIP: 0010:smcr_port_add+0xa6/0xf0 [smc] RSP: 0000:ffffa5a2c8f67de0 EFLAGS: 00010297 RAX: 0000000000000001 RBX: ffff9935e0650000 RCX: 0000000000000000 RDX: 0000000000000010 RSI: ffff9935e0654290 RDI: ffff9935c8560000 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff9934c0401918 R10: 0000000000000000 R11: ffffffffb4a5c278 R12: ffff99364029aae4 R13: ffff99364029aa00 R14: 00000000ffffffed R15: ffff99364029ab08 FS: 0000000000000000(0000) GS:ffff994380600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000f06a10003 CR4: 0000000002770ef0 PKRU: 55555554 Call Trace: smc_ib_port_event_work+0x18f/0x380 [smc] process_one_work+0x19b/0x340 worker_thread+0x30/0x370 ? process_one_work+0x340/0x340 kthread+0x114/0x130 ? __kthread_cancel_work+0x50/0x50 ret_from_fork+0x1f/0x30
References
Impacted products
Vendor Product Version
Linux Linux Version: 1f90a05d9ff907c70456e7c9d7058372679a88c6
Version: 1f90a05d9ff907c70456e7c9d7058372679a88c6
Version: 1f90a05d9ff907c70456e7c9d7058372679a88c6
Version: 1f90a05d9ff907c70456e7c9d7058372679a88c6
Version: 1f90a05d9ff907c70456e7c9d7058372679a88c6
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              "value": "AV:A - The vulnerable walk runs from `smc_ib_port_event_work`, which is scheduled by RoCE async events an adjacent attacker can generate \u2014 IPv6 Router Advertisements churn the netdev\u0027s addresses into `IB_EVENT_GID_CHANGE`, and a RoCE fabric peer can raise `IB_EVENT_QP_ACCESS_ERR`; the racing link-group add/delete is driven by SMC-R connection setup/teardown from a peer on the same fabric.\nAC:L - The attacker controls both sides of the race \u2014 repeated address/GID churn to re-arm `smcr_port_add()` and rapid SMC-R connection create/teardown to add and free link groups \u2014 and the window spans the entire unlocked list traversal, so the attempt can be repeated indefinitely until it lands.\nPR:N - SMC link groups are created and torn down during the CLC handshake before any application-level authentication, and injecting Router Advertisements or malformed RDMA operations requires no credentials on the target.\nUI:N - Everything is driven by inbound link-layer events and connection churn handled in kernel workqueue context; no local user has to open, mount, or run anything.\nS:U - The corruption is confined to kernel memory managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The unlocked iterator dereferences a `struct smc_link_group` that has already been unlinked and kfree\u0027d, reading `pnet_id`, `type`, `net`, and `lnk[]` out of reallocated slab memory and following freed/reused `list` pointers, which is an attacker-influenceable kernel memory read.\nI:H - Reaching `smc_llc_add_link_local()` on the freed link leads to `smc_llc_enqueue()`, which takes a spinlock in freed memory, performs `list_add_tail()` into the freed `lgr-\u003ellc_event_q` (a write into reclaimed slab), and calls `queue_work()` on a freed `work_struct` \u2014 a use-after-free write usable for control-flow hijack after heap grooming.\nA:H - The bug is a confirmed production kernel oops \u2014 NULL pointer dereference at `smcr_port_add+0xa6` in `smc_ib_port_event_work` \u2014 and any use-after-free on the link-group list reliably panics the machine."
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crash.\\nSo, use smc_lgr_list.lock to protect smc_lgr_list.list iterate in\\nsmcr_port_add.\\n\\nThe crash calltrace show below:\\nBUG: kernel NULL pointer dereference, address: 0000000000000000\\nPGD 0 P4D 0\\nOops: 0000 [#1] SMP NOPTI\\nCPU: 0 PID: 559726 Comm: kworker/0:92 Kdump: loaded Tainted: G\\nHardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 449e491 04/01/2014\\nWorkqueue: events smc_ib_port_event_work [smc]\\nRIP: 0010:smcr_port_add+0xa6/0xf0 [smc]\\nRSP: 0000:ffffa5a2c8f67de0 EFLAGS: 00010297\\nRAX: 0000000000000001 RBX: ffff9935e0650000 RCX: 0000000000000000\\nRDX: 0000000000000010 RSI: ffff9935e0654290 RDI: ffff9935c8560000\\nRBP: 0000000000000000 R08: 0000000000000000 R09: ffff9934c0401918\\nR10: 0000000000000000 R11: ffffffffb4a5c278 R12: ffff99364029aae4\\nR13: ffff99364029aa00 R14: 00000000ffffffed R15: ffff99364029ab08\\nFS:  0000000000000000(0000) GS:ffff994380600000(0000) knlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 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