{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-54318", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-30T12:06:44.531Z", "datePublished": "2025-12-30T12:23:48.134Z", "dateUpdated": "2026-08-05T09:19:14.490Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:19:14.490Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: use smc_lgr_list.lock to protect smc_lgr_list.list iterate in smcr_port_add\n\nWhile doing smcr_port_add, there maybe linkgroup add into or delete\nfrom smc_lgr_list.list at the same time, which may result kernel 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: 0000000000000000 CR3: 0000000f06a10003 CR4: 0000000002770ef0\nPKRU: 55555554\nCall Trace:\n smc_ib_port_event_work+0x18f/0x380 [smc]\n process_one_work+0x19b/0x340\n worker_thread+0x30/0x370\n ? process_one_work+0x340/0x340\n kthread+0x114/0x130\n ? __kthread_cancel_work+0x50/0x50\n ret_from_fork+0x1f/0x30" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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 — IPv6 Router Advertisements churn the netdev's 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 — repeated address/GID churn to re-arm `smcr_port_add()` and rapid SMC-R connection create/teardown to add and free link groups — 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'd, 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->llc_event_q` (a write into reclaimed slab), and calls `queue_work()` on a freed `work_struct` — a use-after-free write usable for control-flow hijack after heap grooming.\nA:H - The bug is a confirmed production kernel oops — NULL pointer dereference at `smcr_port_add+0xa6` in `smc_ib_port_event_work` — and any use-after-free on the link-group list reliably panics the machine." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/smc/smc_core.c" ], "versions": [ { "version": "1f90a05d9ff907c70456e7c9d7058372679a88c6", "lessThan": "d1c6c93c27a4bf48006ab16cd9b38d85559d7645", "status": "affected", "versionType": "git" }, { "version": "1f90a05d9ff907c70456e7c9d7058372679a88c6", "lessThan": "06b4934ab2b534bb92935c7601852066ebb9eab8", "status": "affected", "versionType": "git" }, { "version": "1f90a05d9ff907c70456e7c9d7058372679a88c6", "lessThan": "70c8d17007dc4a07156b7da44509527990e569b3", "status": "affected", "versionType": "git" }, { "version": "1f90a05d9ff907c70456e7c9d7058372679a88c6", "lessThan": "b717463610a27fc0b58484cfead7a623d5913e61", "status": "affected", "versionType": "git" }, { "version": "1f90a05d9ff907c70456e7c9d7058372679a88c6", "lessThan": "f5146e3ef0a9eea405874b36178c19a4863b8989", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/smc/smc_core.c" ], "versions": [ { "version": "5.8", "status": "affected" }, { "version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.195", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.132", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.54", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5.4", "lessThanOrEqual": "6.5.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "5.10.195" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "5.15.132" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.1.54" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.5.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.6" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d1c6c93c27a4bf48006ab16cd9b38d85559d7645" }, { "url": "https://git.kernel.org/stable/c/06b4934ab2b534bb92935c7601852066ebb9eab8" }, { "url": "https://git.kernel.org/stable/c/70c8d17007dc4a07156b7da44509527990e569b3" }, { "url": "https://git.kernel.org/stable/c/b717463610a27fc0b58484cfead7a623d5913e61" }, { "url": "https://git.kernel.org/stable/c/f5146e3ef0a9eea405874b36178c19a4863b8989" } ], "title": "net/smc: use smc_lgr_list.lock to protect smc_lgr_list.list iterate in smcr_port_add", "x_generator": { "engine": "bippy-1.2.0" } } } }