{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-80789", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-80789", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-04T15:13:01.161Z", "updatedAt": "2026-10-19T08:43:42.439Z", "importedAt": "2026-10-24T01:58:30.346Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "nvmet-tcp: bound SGL data length before allocating command buffers", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-tcp: bound SGL data length before allocating command buffers\n\nnvmet_tcp_map_data() reads the host-controlled 32-bit sgl->length\nand, for the in-capsule offset descriptor (type 0x01), checks it\nagainst port->inline_data_size before use. Any other SGL descriptor\ntype -- including the non-inline transport SGL data-block descriptor\n(type (NVME_TRANSPORT_SGL_DATA_DESC << 4) | NVME_SGL_FMT_TRANSPORT_A,\nthe type a real host uses for out-of-capsule writes) skips that check\nentirely and falls straight through to:\n\n\tcmd->req.sg = sgl_alloc(len, GFP_KERNEL, &cmd->req.sg_cnt);\n\nwith len taken directly from the wire, unbounded up to 4 GiB.\n\nnvmet_req_init() only parses the command and never inspects\nsgl->length, and nvmet_check_transfer_len() -- the only other place\ntransfer_len is validated -- runs later, from req->execute(), after\nthe allocation has already happened. For a write command the target\nresponds with an R2T and parks the command waiting for the host to\nsend the data; if the host (or an unauthenticated peer that simply\nnever follows up) never does, the sgl_alloc() buffer stays resident\nfor the life of the command. NVMe/TCP has no mandatory authentication\nin the default configuration, so any peer able to reach the target\nportal and complete a Fabrics connect can drive this with a single\ncrafted command, repeatable across queues and connections for\namplification. This is unbounded kernel memory allocation\ntriggered by a remote, effectively unauthenticated peer.\n\nValidate len against the same NVMET_TCP_MAXH2CDATA ceiling this file\nalready uses to bound per-PDU H2C data, for every SGL descriptor type,\nbefore doing any allocation. This closes the gap for the non-inline\ndescriptor while leaving the existing, tighter inline_data_size check\nin place for the in-capsule case.\n\nRuntime-verified on a v6.19 KASAN stand: with this bound in place, a\ncrafted write command carrying an oversized non-inline SGL length is\nrejected before sgl_alloc() runs, where the same request previously\ndrove an unbounded ~256 MiB kernel allocation (up to 4 GiB) that\nstayed resident pending an R2T the host never satisfies.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "status": "affected", "versionType": "git", "lessThan": "f6e51b09cbaa5f6f6e6a3a9dafa666f76c37aab5" }, { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "status": "affected", "versionType": "git", "lessThan": "f63e89a0310264264923f84406dea05fe752de62" }, { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "status": "affected", "versionType": "git", "lessThan": "0952541b153e258b99d39cdb03ea6919fdeb41d0" }, { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "status": "affected", "versionType": "git", "lessThan": "25ad03d5c0e858c4b63f1e4b6d461d2af1b30b22" }, { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "status": "affected", "versionType": "git", "lessThan": "d2acc96c528d589f5827cfb90e8e9229dd9d8cb4" }, { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "status": "affected", "versionType": "git", "lessThan": "6d27199ebe8cb223022150f74be13f154a964474" }, { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "status": "affected", "versionType": "git", "lessThan": "14dbe37681a6a7e346fc147bb363ec7cca3180a0" }, { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "status": "affected", "versionType": "git", "lessThan": "d895e66628f939edbb98608f6e033d3d39e6e546" }, { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "status": "affected", "versionType": "git", "lessThan": "4a3f00262a044e8e15064b1a6860968bf0500bf4" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.0", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.0" }, { "version": "5.10.269", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.220", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.187", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.156", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.106", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.47", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.1.11", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.1.*" }, { "version": "7.2.1", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }