{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-52775", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-21T15:19:24.239Z", "datePublished": "2024-05-21T15:30:56.247Z", "dateUpdated": "2026-08-05T09:11:22.428Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:11:22.428Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: avoid data corruption caused by decline\n\nWe found a data corruption issue during testing of SMC-R on Redis\napplications.\n\nThe benchmark has a low probability of reporting a strange error as\nshown below.\n\n\"Error: Protocol error, got \"\\xe2\" as reply type byte\"\n\nFinally, we found that the retrieved error data was as follows:\n\n0xE2 0xD4 0xC3 0xD9 0x04 0x00 0x2C 0x20 0xA6 0x56 0x00 0x16 0x3E 0x0C\n0xCB 0x04 0x02 0x01 0x00 0x00 0x20 0x00 0x00 0x00 0x00 0x00 0x00 0x00\n0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0xE2\n\nIt is quite obvious that this is a SMC DECLINE message, which means that\nthe applications received SMC protocol message.\nWe found that this was caused by the following situations:\n\nclient server\n ¦ clc proposal\n ------------->\n ¦ clc accept\n <-------------\n ¦ clc confirm\n ------------->\nwait llc confirm\n\t\t\tsend llc confirm\n ¦failed llc confirm\n ¦ x------\n(after 2s)timeout\n wait llc confirm rsp\n\nwait decline\n\n(after 1s) timeout\n (after 2s) timeout\n ¦ decline\n -------------->\n ¦ decline\n <--------------\n\nAs a result, a decline message was sent in the implementation, and this\nmessage was read from TCP by the already-fallback connection.\n\nThis patch double the client timeout as 2x of the server value,\nWith this simple change, the Decline messages should never cross or\ncollide (during Confirm link timeout).\n\nThis issue requires an immediate solution, since the protocol updates\ninvolve a more long-term solution." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L", "baseScore": 8.2, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - SMC-R CLC handshake and DECLINE exchange run over TCP with a remote peer; a network attacker who speaks SMC to an SMC-enabled service (e.g. smc_run Redis/nginx) can drive the confirm-link timeout and fallback path.\nAC:L - A malicious SMC peer can withhold the RoCE LLC CONFIRM LINK response and thereby force both sides through the fixed timeout/decline sequence; the client/server wait asymmetry makes decline crossing a reliable consequence rather than an uncontrolled race.\nPR:N - The vulnerable path runs during unauthenticated SMC connection setup; no credentials or privileges are required beyond being able to complete the CLC handshake as a peer.\nUI:N - Exploitation does not need a victim user action; the attacker initiates or participates in the SMC connection and triggers the timeout/decline path directly.\nS:U - Impact stays within the same host kernel and the affected connection’s application data; there is no VM, IOMMU, or other security-authority boundary crossing.\nC:N - The bug only injects a kernel-generated CLC DECLINE into the stream; it does not disclose arbitrary memory or other confidential data beyond ordinary peer protocol fields.\nI:H - CLC DECLINE bytes are delivered as application payload after TCP fallback, corrupting the data stream (e.g. Redis protocol errors), which is a serious integrity break of SMC’s guarantee that CLC is consumed by the kernel.\nA:L - Corrupted messages cause application-level protocol failures and interrupted operations on affected connections, but there is no kernel oops/panic or complete host denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/smc/af_smc.c" ], "versions": [ { "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "lessThan": "5ada292b5c504720a0acef8cae9acc62a694d19c", "status": "affected", "versionType": "git" }, { "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "lessThan": "90072af9efe8c7bd7d086709014ddd44cebd5e7c", "status": "affected", "versionType": "git" }, { "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "lessThan": "94a0ae698b4d5d5bb598e23228002a1491c50add", "status": "affected", "versionType": "git" }, { "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "lessThan": "7234d2b5dffa5af77fd4e0deaebab509e130c6b1", "status": "affected", "versionType": "git" }, { "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "lessThan": "e6d71b437abc2f249e3b6a1ae1a7228e09c6e563", "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/af_smc.c" ], "versions": [ { "version": "5.8", "status": "affected" }, { "version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.203", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.141", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.65", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.4", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7", "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": "5.10.203" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "5.15.141" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.1.65" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.6.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.7" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5ada292b5c504720a0acef8cae9acc62a694d19c" }, { "url": "https://git.kernel.org/stable/c/90072af9efe8c7bd7d086709014ddd44cebd5e7c" }, { "url": "https://git.kernel.org/stable/c/94a0ae698b4d5d5bb598e23228002a1491c50add" }, { "url": "https://git.kernel.org/stable/c/7234d2b5dffa5af77fd4e0deaebab509e130c6b1" }, { "url": "https://git.kernel.org/stable/c/e6d71b437abc2f249e3b6a1ae1a7228e09c6e563" } ], "title": "net/smc: avoid data corruption caused by decline", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2023-52775", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-05-22T18:24:43.628155Z" } } } ], "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:22:47.888Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T23:11:35.820Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/5ada292b5c504720a0acef8cae9acc62a694d19c", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/90072af9efe8c7bd7d086709014ddd44cebd5e7c", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/94a0ae698b4d5d5bb598e23228002a1491c50add", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/7234d2b5dffa5af77fd4e0deaebab509e130c6b1", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/e6d71b437abc2f249e3b6a1ae1a7228e09c6e563", "tags": [ "x_transferred" ] } ] } ] } }