CVE-2026-80789— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于nvmet_tcp_map_data()函数未对所有SGL描述符类型的sgl->length长度进行限制便分配命令缓冲区，可能导致远程未认证攻击者通过特制命令触发无界内核内存分配，造成拒绝服务。
影响版本矩阵 20
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 872d26a391da92ed8f0c0f5cb5fef428067b7f30< f6e51b09cbaa5f6f6e6a3a9dafa666f76c37aab5 |
affected |
872d26a391da92ed8f0c0f5cb5fef428067b7f30< f63e89a0310264264923f84406dea05fe752de62 |
affected | ||
872d26a391da92ed8f0c0f5cb5fef428067b7f30< 0952541b153e258b99d39cdb03ea6919fdeb41d0 |
affected | ||
872d26a391da92ed8f0c0f5cb5fef428067b7f30< 25ad03d5c0e858c4b63f1e4b6d461d2af1b30b22 |
affected | ||
872d26a391da92ed8f0c0f5cb5fef428067b7f30< d2acc96c528d589f5827cfb90e8e9229dd9d8cb4 |
affected | ||
872d26a391da92ed8f0c0f5cb5fef428067b7f30< 6d27199ebe8cb223022150f74be13f154a964474 |
affected | ||
872d26a391da92ed8f0c0f5cb5fef428067b7f30< 14dbe37681a6a7e346fc147bb363ec7cca3180a0 |
affected | ||
872d26a391da92ed8f0c0f5cb5fef428067b7f30< d895e66628f939edbb98608f6e033d3d39e6e546 |
affected | ||
| … +12 条更多 | |||
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一、 漏洞 CVE-2026-80789 基础信息
漏洞信息
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Vulnerability Title
nvmet-tcp: bound SGL data length before allocating command buffers
来源: CVE Program / CVE List V5
Vulnerability Description
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.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于nvmet_tcp_map_data()函数未对所有SGL描述符类型的sgl->length长度进行限制便分配命令缓冲区，可能导致远程未认证攻击者通过特制命令触发无界内核内存分配，造成拒绝服务。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-80789 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-80789 补丁与修复 (8)
同批安全公告 · Linux · 2026-09-04 · 共 156 条
| CVE-2026-80865 | Linux kernel 安全漏洞 | |
| CVE-2026-80856 | Linux kernel 安全漏洞 | |
| CVE-2026-80857 | Linux kernel 安全漏洞 | |
| CVE-2026-80858 | Linux kernel 安全漏洞 | |
| CVE-2026-80859 | Linux kernel 安全漏洞 | |
| CVE-2026-80860 | Linux kernel 安全漏洞 | |
| CVE-2026-80861 | Linux kernel 安全漏洞 | |
| CVE-2026-80862 | Linux kernel 安全漏洞 | |
| CVE-2026-80863 | Linux kernel 安全漏洞 | |
| CVE-2026-80864 | Linux kernel 安全漏洞 | |
| CVE-2026-80870 | Linux kernel 安全漏洞 | |
| CVE-2026-80874 | Linux kernel 安全漏洞 | |
| CVE-2026-80873 | Linux kernel 安全漏洞 | |
| CVE-2026-80872 | Linux kernel 安全漏洞 | |
| CVE-2026-80871 | Linux kernel 安全漏洞 | |
| CVE-2026-80868 | Linux kernel 安全漏洞 | |
| CVE-2026-80866 | Linux kernel 安全漏洞 | |
| CVE-2026-80867 | Linux kernel 安全漏洞 | |
| CVE-2026-80855 | Linux kernel 安全漏洞 | |
| CVE-2026-80869 | Linux kernel 安全漏洞 |
显示前 20 条，共 156 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-80789
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