CVE-2026-90414— IB/isert拒绝声明超出实际接收数据的PDU
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。
在 Linux 内核中，已修复如下漏洞： IB/isert：拒绝声明接收数据量超过实际接收量的 PDU 在处理每个接收到的 PDU 时，直接将其交给操作码（opcode）处理器，却从未检查 ——即主机通道适配器（HCA）实际放入接收描述符中的字节数。随后，这些处理器会从固定大小的描述符中复制相应数量的字节，其长度依据的是发起方在基头段（BHS）中声明的数据段长度（通过 派生出的 或 ）： 由于声明的长度从未与实际接收的 进行比对，发起方可以声明一个比其实际发送的字节数更大（且大于描述符容量）的数据段，从而导致接收缓
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | b8d26b3be8b33682cf163274ed07479a70554633< b4706722ed3ea72882b3c986a19b4a1ba66384c4 |
affected |
b8d26b3be8b33682cf163274ed07479a70554633< bc58e9d3dc560220c57b8bdfc12af0cff1c8a43d |
affected | ||
b8d26b3be8b33682cf163274ed07479a70554633< 274b1ad7e78338710864c4b4235bb1ce7e7107f9 |
affected | ||
b8d26b3be8b33682cf163274ed07479a70554633< 2a6b8f88fb7ee51714a1922a039225bdcaf12855 |
affected | ||
b8d26b3be8b33682cf163274ed07479a70554633< 39da0b7e1f530347d284cebcfc5b5afa90a173bf |
affected | ||
b8d26b3be8b33682cf163274ed07479a70554633< cf36fa5357a2fb25776a568d13a3653da7d99bcb |
affected | ||
b8d26b3be8b33682cf163274ed07479a70554633< 352dc85324b29f5c85876f2666f3158b645e3f18 |
affected | ||
b8d26b3be8b33682cf163274ed07479a70554633< 957f92ea4022fb6af4618271615a2a21a7b5bef9 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-90414 基础信息
漏洞信息
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Vulnerability Title
IB/isert: reject PDUs declaring more data than was received
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
IB/isert: reject PDUs declaring more data than was received
isert_recv_done() hands each received PDU to the opcode handlers without
ever looking at wc->byte_len, the number of bytes the HCA actually placed
in the receive descriptor. The handlers then copy that many bytes - the
data-segment length the initiator declared in the BHS
(ntoh24(hdr->dlength), via the derived unsol_data_len / imm_data_len) -
out of the fixed-size descriptor:
isert_handle_iscsi_dataout():
sg_copy_from_buffer(sg_start, sg_nents, isert_get_data(rx_desc),
unsol_data_len);
isert_handle_scsi_cmd():
sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
isert_get_data(rx_desc), imm_data_len);
Because the declared length is never checked against wc->byte_len, an
initiator can declare a data segment larger than the bytes it actually
sent (and larger than the descriptor) and cause an out-of-bounds read of
the receive buffer.
Nothing upstream of isert closes this door:
- __iscsit_check_dataout_hdr() bounds the inbound payload against
conn_ops->MaxXmitDataSegmentLength (MXDSL) - a transmit parameter,
used here for the inbound check.
- iscsi_set_connection_parameters() sets
ops->MaxXmitDataSegmentLength = ops->TargetRecvDataSegmentLength;
and TARGETRECVDATASEGMENTLENGTH is absent from the min()-clamp list in
iscsi_check_acceptor_state(), so the value the initiator declares is
adopted verbatim (type range 512..16777215). The initiator effectively
raises its own ceiling.
- isert never clamps the negotiated value to its own fixed receive
descriptor (ISER_RX_SIZE, 9216 bytes), so the target core's bound and
the descriptor size are unrelated.
The imm_data_len == data_len path is more than an over-read: it aliases
the receive descriptor via sg_set_buf() and passes it to the backend as
the data source for the SCSI WRITE, so an over-declared length causes heap
contents past the descriptor to be written through the backend to the
backing store. The backend is the victim of the oversized scatterlist
isert hands it, not the cause; no read-back of the written bytes was
demonstrated.
Trigger: after login completes (full feature phase), an initiator that has
declared a large TargetRecvDataSegmentLength and a FirstBurstLength that
permits unsolicited/immediate data sends a PDU whose declared data-segment
length exceeds what was received. With KASAN:
BUG: KASAN: slab-out-of-bounds in sg_copy_buffer+0x150/0x1c0
Read of size 4096 at addr ffff888109720800 by task kworker/1:0H/25
Workqueue: ib-comp-wq ib_cq_poll_work
Call Trace:
sg_copy_buffer+0x150/0x1c0
isert_recv_done+0xba6/0x2390
__ib_process_cq+0xe1/0x390
ib_cq_poll_work+0x46/0x150
isert_recv_done+0xba6 resolves to isert_handle_iscsi_dataout()
(ib_isert.c:1160), inlined through isert_rx_opcode().
Validate wc->byte_len against the framing in isert_recv_done() before the
PDU reaches any handler, and reinstate the connection if it is short.
Because the test compares without subtracting the header length, it also
rejects PDUs shorter than the iSER and iSCSI headers, which would otherwise
be parsed out of stale descriptor contents. The login handler rejects PDUs
shorter than ISER_HEADERS_LEN (commit 29e7b925ae6d ("IB/isert: Reject login
PDUs shorter than ISER_HEADERS_LEN")) but does not bound the declared
length either; that is fixed in the next patch. The data handlers had no
length check at all.
isert reads the data segment from a fixed offset: isert_get_data()
returns the iSER header plus ISER_HEADERS_LEN and makes no adjustment for
an AHS. The bytes the handlers touch are therefore exactly
[ISER_HEADERS_LEN, ISER_HEADERS_LEN + dlength), and comparing that sum
against wc->byte_len bounds precisely the region that is read. An AHS
term would only make the test stricter without bounding anything furth
---truncated---
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-90414 的公开POC
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CVE-2026-90414 补丁与修复 (8)
同批安全公告 · Linux · 2026-09-17 · 共 600 条
| CVE-2026-92489 | 9.8 CRITICAL | Linux内核 xfrm 双重释放漏洞 |
| CVE-2026-90104 | 9.8 CRITICAL | NFSv4.1 解码前未清空调用列表 |
| CVE-2026-90173 | 9.8 CRITICAL | SMB SmbDirect 释放完成队列漏洞 |
| CVE-2026-90151 | 9.8 CRITICAL | NFSv4客户端分配失败回调处理漏洞 |
| CVE-2026-90235 | 9.8 CRITICAL | 内核sunrpc xprtsock并发读取修复 |
| CVE-2026-90110 | 9.4 CRITICAL | inetpeer 随机化RB树节点比较 |
| CVE-2026-90230 | 9.1 CRITICAL | Linux内核Nvme-target堆越界读取漏洞 |
| CVE-2026-90413 | 9.1 CRITICAL | IB/isert 登录PDU数据长度校验漏洞 |
| CVE-2026-90381 | 8.8 HIGH | Linux内核mt76驱动无线信道切换漏洞 |
| CVE-2026-93189 | 8.8 HIGH | Linux HID核心使用已释放内存漏洞 |
| CVE-2026-90329 | 8.8 HIGH | Linux 内核 HID 驱动探测清理同步漏洞 |
| CVE-2026-90256 | 8.8 HIGH | Linux Bluetooth L2CAP 远程代码执行漏洞 |
| CVE-2026-90357 | 8.8 HIGH | mt76驱动MT7915无线局域网远程拒绝服务漏洞 |
| CVE-2026-90255 | 8.8 HIGH | Linux内核 Bluetooth 漏洞 |
| CVE-2026-90367 | 8.8 HIGH | Linux内核MT7996驱动死锁漏洞 |
| CVE-2026-90286 | 8.8 HIGH | AMDGPU GFX6 计算队列PFP使用漏洞 |
| CVE-2026-90240 | 8.8 HIGH | Linux内核 IOMMU 别名拆除时刷新缓存错误 |
| CVE-2026-90380 | 8.8 HIGH | MT76驱动 mt792x 使用释放后内存漏洞 |
| CVE-2026-90379 | 8.8 HIGH | Linux 内核 mt76 驱动系统崩溃漏洞 |
| CVE-2026-90162 | 8.8 HIGH | Linux ksmbd 锁授予UAF/双重释放竞态漏洞 |
显示前 20 条，共 600 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-90414
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