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CVE-2026-80789 (GCVE-0-2026-80789)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:13 – Updated: 2026-09-04 15:13
VLAI
Title
nvmet-tcp: bound SGL data length before allocating command buffers
Summary
In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: bound SGL data length before allocating command buffers nvmet_tcp_map_data() reads the host-controlled 32-bit sgl->length and, for the in-capsule offset descriptor (type 0x01), checks it against port->inline_data_size before use. Any other SGL descriptor type -- including the non-inline transport SGL data-block descriptor (type (NVME_TRANSPORT_SGL_DATA_DESC << 4) | NVME_SGL_FMT_TRANSPORT_A, the type a real host uses for out-of-capsule writes) skips that check entirely and falls straight through to: cmd->req.sg = sgl_alloc(len, GFP_KERNEL, &cmd->req.sg_cnt); with len taken directly from the wire, unbounded up to 4 GiB. nvmet_req_init() only parses the command and never inspects sgl->length, and nvmet_check_transfer_len() -- the only other place transfer_len is validated -- runs later, from req->execute(), after the allocation has already happened. For a write command the target responds with an R2T and parks the command waiting for the host to send the data; if the host (or an unauthenticated peer that simply never follows up) never does, the sgl_alloc() buffer stays resident for the life of the command. NVMe/TCP has no mandatory authentication in the default configuration, so any peer able to reach the target portal and complete a Fabrics connect can drive this with a single crafted command, repeatable across queues and connections for amplification. This is unbounded kernel memory allocation triggered by a remote, effectively unauthenticated peer. Validate len against the same NVMET_TCP_MAXH2CDATA ceiling this file already uses to bound per-PDU H2C data, for every SGL descriptor type, before doing any allocation. This closes the gap for the non-inline descriptor while leaving the existing, tighter inline_data_size check in place for the in-capsule case. Runtime-verified on a v6.19 KASAN stand: with this bound in place, a crafted write command carrying an oversized non-inline SGL length is rejected before sgl_alloc() runs, where the same request previously drove an unbounded ~256 MiB kernel allocation (up to 4 GiB) that stayed resident pending an R2T the host never satisfies.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 872d26a391da92ed8f0c0f5cb5fef428067b7f30 , < f6e51b09cbaa5f6f6e6a3a9dafa666f76c37aab5 (git)
Affected: 872d26a391da92ed8f0c0f5cb5fef428067b7f30 , < f63e89a0310264264923f84406dea05fe752de62 (git)
Affected: 872d26a391da92ed8f0c0f5cb5fef428067b7f30 , < 0952541b153e258b99d39cdb03ea6919fdeb41d0 (git)
Affected: 872d26a391da92ed8f0c0f5cb5fef428067b7f30 , < 25ad03d5c0e858c4b63f1e4b6d461d2af1b30b22 (git)
Affected: 872d26a391da92ed8f0c0f5cb5fef428067b7f30 , < d2acc96c528d589f5827cfb90e8e9229dd9d8cb4 (git)
Affected: 872d26a391da92ed8f0c0f5cb5fef428067b7f30 , < 6d27199ebe8cb223022150f74be13f154a964474 (git)
Affected: 872d26a391da92ed8f0c0f5cb5fef428067b7f30 , < 14dbe37681a6a7e346fc147bb363ec7cca3180a0 (git)
Affected: 872d26a391da92ed8f0c0f5cb5fef428067b7f30 , < d895e66628f939edbb98608f6e033d3d39e6e546 (git)
Affected: 872d26a391da92ed8f0c0f5cb5fef428067b7f30 , < 4a3f00262a044e8e15064b1a6860968bf0500bf4 (git)
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Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 5.10.269 , ≤ 5.10.* (semver)
Unaffected: 5.15.220 , ≤ 5.15.* (semver)
Unaffected: 6.1.187 , ≤ 6.1.* (semver)
Unaffected: 6.6.156 , ≤ 6.6.* (semver)
Unaffected: 6.12.106 , ≤ 6.12.* (semver)
Unaffected: 6.18.47 , ≤ 6.18.* (semver)
Unaffected: 7.1.11 , ≤ 7.1.* (semver)
Unaffected: 7.2.1 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "value": "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-\u003elength\nand, for the in-capsule offset descriptor (type 0x01), checks it\nagainst port-\u003einline_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 \u003c\u003c 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-\u003ereq.sg = sgl_alloc(len, GFP_KERNEL, \u0026cmd-\u003ereq.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-\u003elength, and nvmet_check_transfer_len() -- the only other place\ntransfer_len is validated -- runs later, from req-\u003eexecute(), 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."
        }
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/f6e51b09cbaa5f6f6e6a3a9dafa666f76c37aab5"
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        {
          "url": "https://git.kernel.org/stable/c/f63e89a0310264264923f84406dea05fe752de62"
        },
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          "url": "https://git.kernel.org/stable/c/0952541b153e258b99d39cdb03ea6919fdeb41d0"
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          "url": "https://git.kernel.org/stable/c/d2acc96c528d589f5827cfb90e8e9229dd9d8cb4"
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        },
        {
          "url": "https://git.kernel.org/stable/c/4a3f00262a044e8e15064b1a6860968bf0500bf4"
        }
      ],
      "title": "nvmet-tcp: bound SGL data length before allocating command buffers",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80789",
    "datePublished": "2026-09-04T15:13:01.161Z",
    "dateReserved": "2026-08-26T14:34:25.793Z",
    "dateUpdated": "2026-09-04T15:13:01.161Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80789",
      "date": "2026-09-15",
      "epss": "0.00234",
      "percentile": "0.14423"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-07T01:49:15.000Z",
      "cve": "CVE-2026-80789",
      "id": "msrc_CVE-2026-80789",
      "initial_release_date": "2026-09-06T05:08:37.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "nvmet-tcp: bound SGL data length before allocating command buffers",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80789.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80789\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-04T16:18:05.010\",\"lastModified\":\"2026-09-04T16:18:05.010\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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-\u003elength\\nand, for the in-capsule offset descriptor (type 0x01), checks it\\nagainst port-\u003einline_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 \u003c\u003c 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-\u003ereq.sg = sgl_alloc(len, GFP_KERNEL, \u0026cmd-\u003ereq.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-\u003elength, and nvmet_check_transfer_len() -- the only other place\\ntransfer_len is validated -- runs later, from req-\u003eexecute(), 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\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/nvme/target/tcp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"872d26a391da92ed8f0c0f5cb5fef428067b7f30\",\"lessThan\":\"f6e51b09cbaa5f6f6e6a3a9dafa666f76c37aab5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"872d26a391da92ed8f0c0f5cb5fef428067b7f30\",\"lessThan\":\"f63e89a0310264264923f84406dea05fe752de62\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"872d26a391da92ed8f0c0f5cb5fef428067b7f30\",\"lessThan\":\"0952541b153e258b99d39cdb03ea6919fdeb41d0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"872d26a391da92ed8f0c0f5cb5fef428067b7f30\",\"lessThan\":\"25ad03d5c0e858c4b63f1e4b6d461d2af1b30b22\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"872d26a391da92ed8f0c0f5cb5fef428067b7f30\",\"lessThan\":\"d2acc96c528d589f5827cfb90e8e9229dd9d8cb4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"872d26a391da92ed8f0c0f5cb5fef428067b7f30\",\"lessThan\":\"6d27199ebe8cb223022150f74be13f154a964474\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"872d26a391da92ed8f0c0f5cb5fef428067b7f30\",\"lessThan\":\"14dbe37681a6a7e346fc147bb363ec7cca3180a0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"872d26a391da92ed8f0c0f5cb5fef428067b7f30\",\"lessThan\":\"d895e66628f939edbb98608f6e033d3d39e6e546\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"872d26a391da92ed8f0c0f5cb5fef428067b7f30\",\"lessThan\":\"4a3f00262a044e8e15064b1a6860968bf0500bf4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/nvme/target/tcp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.269\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.220\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.187\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.156\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.106\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.47\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.11\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.1\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0952541b153e258b99d39cdb03ea6919fdeb41d0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/14dbe37681a6a7e346fc147bb363ec7cca3180a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/25ad03d5c0e858c4b63f1e4b6d461d2af1b30b22\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4a3f00262a044e8e15064b1a6860968bf0500bf4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6d27199ebe8cb223022150f74be13f154a964474\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d2acc96c528d589f5827cfb90e8e9229dd9d8cb4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d895e66628f939edbb98608f6e033d3d39e6e546\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f63e89a0310264264923f84406dea05fe752de62\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f6e51b09cbaa5f6f6e6a3a9dafa666f76c37aab5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-10T01:51:40Z",
      "cve": "CVE-2026-80789",
      "id": "CVE-2026-80789",
      "initial_release_date": "2026-09-05T00:27:22Z",
      "product_status:known_affected": "335",
      "product_status:known_not_affected": "6",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80789",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80789.json",
      "version": "4"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.