{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53110", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-05-02T15:51:43.554Z", "datePublished": "2025-05-02T15:55:50.367Z", "dateUpdated": "2026-08-05T09:12:49.931Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:12:49.931Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler()\n\nWhen performing a stress test on SMC-R by rmmod mlx5_ib driver\nduring the wrk/nginx test, we found that there is a probability\nof triggering a panic while terminating all link groups.\n\nThis issue dues to the race between smc_smcr_terminate_all()\nand smc_buf_create().\n\n\t\t\tsmc_smcr_terminate_all\n\nsmc_buf_create\n/* init */\nconn->sndbuf_desc = NULL;\n...\n\n\t\t\t__smc_lgr_terminate\n\t\t\t\tsmc_conn_kill\n\t\t\t\t\tsmc_close_abort\n\t\t\t\t\t\tsmc_cdc_get_slot_and_msg_send\n\n\t\t\t__softirqentry_text_start\n\t\t\t\tsmc_wr_tx_process_cqe\n\t\t\t\t\tsmc_cdc_tx_handler\n\t\t\t\t\t\tREAD(conn->sndbuf_desc->len);\n\t\t\t\t\t\t/* panic dues to NULL sndbuf_desc */\n\nconn->sndbuf_desc = xxx;\n\nThis patch tries to fix the issue by always to check the sndbuf_desc\nbefore send any cdc msg, to make sure that no null pointer is\nseen during cqe processing." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The race window is on the SMC server listen path (smc_listen_work → smc_listen_rdma_init → smc_conn_create then smc_buf_create), driven by remote CLC over TCP and peer LLC DELETE_LINK/protocol events over RoCE; SMC-Rv2/RoCEv2 and CLC are IP-routable, matching other SMC remote scores.\nAC:L - A remote peer controls both sides: it opens handshakes that register a connection with sndbuf_desc still NULL, and can force __smc_lgr_terminate via LLC DELETE_LINK ALL or CLC decline, retrying across parallel connections through a wide sleeping buf-create window.\nPR:N - CLC/LLC run before any application authentication; SMC performs no peer credential checks, and reaching an AF_SMC listener needs no account or capability on the target.\nUI:N - The listen worker and terminate_work run automatically on inbound SMC traffic and peer link teardown with no local user action required.\nS:U - The NULL dereference oops stays inside the host kernel SMC/RDMA softirq path and does not cross a VM, IOMMU, or other security authority.\nC:N - smc_cdc_tx_handler only loads conn->sndbuf_desc->len when sndbuf_desc is still NULL (never assigned); this is a pure NULL pointer dereference with no UAF/OOB read or disclosure primitive.\nI:N - The fault is a NULL dereference on a never-set pointer under mmap_min_addr, with no OOB write, type confusion, or other corruption that could yield a write or code-execution primitive.\nA:H - The documented failure is a kernel panic/oops in softirq (smc_wr_tx_process_cqe → smc_cdc_tx_handler reading sndbuf_desc->len), which is High availability impact and is remotely repeatable." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/smc/smc_cdc.c" ], "versions": [ { "version": "0b29ec6436138721acf5844e558f7334a0fa61d5", "lessThan": "31817c530768b0199771ec6019571b4f0ddbf230", "status": "affected", "versionType": "git" }, { "version": "0b29ec6436138721acf5844e558f7334a0fa61d5", "lessThan": "b108bd9e6be000492ebebe867daa699285978a10", "status": "affected", "versionType": "git" }, { "version": "0b29ec6436138721acf5844e558f7334a0fa61d5", "lessThan": "3c270435db8aa34929263dddae8fd050f5216ecb", "status": "affected", "versionType": "git" }, { "version": "0b29ec6436138721acf5844e558f7334a0fa61d5", "lessThan": "3ebac7cf0a184a8102821a7a00203f02bebda83c", "status": "affected", "versionType": "git" }, { "version": "0b29ec6436138721acf5844e558f7334a0fa61d5", "lessThan": "22a825c541d775c1dbe7b2402786025acad6727b", "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_cdc.c" ], "versions": [ { "version": "5.5", "status": "affected" }, { "version": "0", "lessThan": "5.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.176", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.104", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.21", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2.8", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3", "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": "5.5", "versionEndExcluding": "5.10.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.15.104" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.1.21" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.2.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/31817c530768b0199771ec6019571b4f0ddbf230" }, { "url": "https://git.kernel.org/stable/c/b108bd9e6be000492ebebe867daa699285978a10" }, { "url": "https://git.kernel.org/stable/c/3c270435db8aa34929263dddae8fd050f5216ecb" }, { "url": "https://git.kernel.org/stable/c/3ebac7cf0a184a8102821a7a00203f02bebda83c" }, { "url": "https://git.kernel.org/stable/c/22a825c541d775c1dbe7b2402786025acad6727b" } ], "title": "net/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler()", "x_generator": { "engine": "bippy-1.2.0" } } } }