{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46027", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.093Z", "datePublished": "2026-05-27T12:56:35.628Z", "dateUpdated": "2026-08-05T12:29:12.274Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:29:12.274Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: avoid early lgr access in smc_clc_wait_msg\n\nA CLC decline can be received while the handshake is still in an early\nstage, before the connection has been associated with a link group.\n\nThe decline handling in smc_clc_wait_msg() updates link-group level sync\nstate for first-contact declines, but that state only exists after link\ngroup setup has completed. Guard the link-group update accordingly and\nkeep the per-socket peer diagnosis handling unchanged.\n\nThis preserves the existing sync_err handling for established link-group\ncontexts and avoids touching link-group state before it is available." } ], "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 SMC CLC handshake runs over a TCP connection; a remote peer (a malicious client connecting to a listening SMC server, or a malicious server) triggers the dereference by sending a crafted DECLINE message, so the code is reachable purely over the network.\nAC:L - The attacker reliably crafts a DECLINE message with the SMC_FIRST_CONTACT_MASK bit set; the lgr==NULL condition is the default early-handshake state (the first message the server processes), so there is no race or condition outside attacker control.\nPR:N - On the server-side listen path the dereference occurs while processing the very first handshake message, before any authentication, so an unauthenticated remote peer requires no privileges.\nUI:N - A server with an AF_SMC listening socket processes the malicious handshake passively in a work queue with no local user action required.\nS:U - The crash is confined to the kernel's own security scope; no boundary (VM/IOMMU/sandbox) is crossed.\nC:N - This is a NULL pointer dereference with no information disclosure — no kernel memory contents are read or leaked.\nI:N - The write is to NULL plus a small fixed bitfield offset on a never-initialized pointer (not a controllable/dangling pointer), so it only crashes and provides no exploitable write primitive.\nA:H - Dereferencing the NULL lgr pointer causes a kernel oops/panic, taking down the system in a remotely-triggerable, unauthenticated 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/smc_clc.c" ], "versions": [ { "version": "0cfdd8f92cac01afbb12e4500514036a2b78756b", "lessThan": "257cdf0c5ced9c0fba8aba501d94b0a5fcef2086", "status": "affected", "versionType": "git" }, { "version": "0cfdd8f92cac01afbb12e4500514036a2b78756b", "lessThan": "22546729b96fc873b23065dc49e3d73c45cfb874", "status": "affected", "versionType": "git" }, { "version": "0cfdd8f92cac01afbb12e4500514036a2b78756b", "lessThan": "5eedbfd82c2884e0010fdfb3c9446a6ebcadb691", "status": "affected", "versionType": "git" }, { "version": "0cfdd8f92cac01afbb12e4500514036a2b78756b", "lessThan": "f0858e1d5624bb120b198f2a8528f97a9b0ae069", "status": "affected", "versionType": "git" }, { "version": "0cfdd8f92cac01afbb12e4500514036a2b78756b", "lessThan": "6180a296ca65b08a81914805cbc0f78da5f10a1f", "status": "affected", "versionType": "git" }, { "version": "0cfdd8f92cac01afbb12e4500514036a2b78756b", "lessThan": "ea0b5d0fe96356dce38f98375a57c52a04e13712", "status": "affected", "versionType": "git" }, { "version": "0cfdd8f92cac01afbb12e4500514036a2b78756b", "lessThan": "83bcf9228b0501694fb2589ed1d142855a2887f2", "status": "affected", "versionType": "git" }, { "version": "0cfdd8f92cac01afbb12e4500514036a2b78756b", "lessThan": "5a8db80f721deee8e916c2cfdee78decda02ce4f", "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_clc.c" ], "versions": [ { "version": "4.11", "status": "affected" }, { "version": "0", "lessThan": "4.11", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.86", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.27", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.4", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "4.11", "versionEndExcluding": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.6.140" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.12.86" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.18.27" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "7.0.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/257cdf0c5ced9c0fba8aba501d94b0a5fcef2086" }, { "url": "https://git.kernel.org/stable/c/22546729b96fc873b23065dc49e3d73c45cfb874" }, { "url": "https://git.kernel.org/stable/c/5eedbfd82c2884e0010fdfb3c9446a6ebcadb691" }, { "url": "https://git.kernel.org/stable/c/f0858e1d5624bb120b198f2a8528f97a9b0ae069" }, { "url": "https://git.kernel.org/stable/c/6180a296ca65b08a81914805cbc0f78da5f10a1f" }, { "url": "https://git.kernel.org/stable/c/ea0b5d0fe96356dce38f98375a57c52a04e13712" }, { "url": "https://git.kernel.org/stable/c/83bcf9228b0501694fb2589ed1d142855a2887f2" }, { "url": "https://git.kernel.org/stable/c/5a8db80f721deee8e916c2cfdee78decda02ce4f" } ], "title": "net/smc: avoid early lgr access in smc_clc_wait_msg", "x_generator": { "engine": "bippy-1.2.0" } } } }