CVE-2026-89533— 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svc_rdma_read_chunk_range()处理Read chunk段列表时偏移算术错误，跳过条件使用'>'而非'>='，长度计算未对段残差取上限，导致u32下溢并传递超大nr_bvec，可能造成错误DMA长度和大规模内存分配。
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | d7cc73972661be4a02a1b09f1d9b3283c6c05154< 10873311f91db9454e2fadbf9866bc819e0646d9 |
affected |
d7cc73972661be4a02a1b09f1d9b3283c6c05154< addbf02dfe3b25e7e38e03bbd4e2a6ed86a14be7 |
affected | ||
d7cc73972661be4a02a1b09f1d9b3283c6c05154< cba8543c18cf42fd80fd63effb6df6ff4f7e73ce |
affected | ||
d7cc73972661be4a02a1b09f1d9b3283c6c05154< 6ee4dc7476b3abc92ec1d444533a559f33f59561 |
affected | ||
d7cc73972661be4a02a1b09f1d9b3283c6c05154< a46b35f213c2426f5d6a0458a8f7e873fc59cdfd |
affected | ||
d7cc73972661be4a02a1b09f1d9b3283c6c05154< 4493c96bbd0068fadf69cbae8d13426202e34cdc |
affected | ||
d7cc73972661be4a02a1b09f1d9b3283c6c05154< 4a44c140cc2f3643a39e258bb0c0ab9d0f494f5e |
affected | ||
5.11 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2026-89533 基础信息
漏洞信息
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Vulnerability Title
svcrdma: Fix offset arithmetic in read_chunk_range
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
svcrdma: Fix offset arithmetic in read_chunk_range
svc_rdma_read_chunk_range() walks a Read chunk's segment list to
build a sub-range starting at byte offset and spanning length bytes
for a Position-Zero or Call chunk. Two arithmetic defects in the
per-segment loop produce wrong DMA lengths and a u32 underflow:
pcl_for_each_segment(segment, chunk) {
if (offset > segment->rs_length) {
offset -= segment->rs_length;
continue;
}
dummy.rs_handle = segment->rs_handle;
dummy.rs_length = min_t(u32, length,
segment->rs_length) - offset;
dummy.rs_offset = segment->rs_offset + offset;
First, the skip predicate uses '>' instead of '>='. When offset
equals the segment's full rs_length, the segment is fully consumed
and should be skipped, but the loop falls through into the body.
The resulting dummy.rs_length is min_t(u32, length, rs_length) -
rs_length, which underflows to a near-UINT_MAX u32 when length is
smaller than rs_length, or is zero otherwise.
Second, the length formula subtracts offset from the min_t() result
rather than from segment->rs_length before the cap. For offset > 0
the segment's residual is rs_length - offset, not rs_length, so the
cap must be applied to the residual. With the current bracketing,
whenever length is smaller than rs_length - offset the per-segment
length becomes length - offset instead of length, silently dropping
offset bytes from the rebuilt chunk. Combined with the boundary
case above it also enables the u32 underflow path, which propagates
a huge nr_bvec into svc_rdma_build_read_segment() and a multi-MiB
kmalloc_array_node() in svc_rdma_get_rw_ctxt().
Additionally, svc_rdma_read_call_chunk() can invoke this function
with length == 0 when the last Read chunk ends exactly at the end
of the Call chunk. With the corrected >= predicate, every segment
is skipped and the function returns the initial -EINVAL, rejecting
a valid request. Return success immediately when length is zero.
Also break out of the loop once length is fully consumed to avoid
passing zero-length segments to svc_rdma_build_read_segment().
Fix by using '>=' so a fully-consumed segment is skipped, by
moving '- offset' inside min_t() so the cap is applied to the
segment's residual length, by returning success for zero-length
requests, and by stopping iteration when the requested range has
been consumed.
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:H/A:H
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svc_rdma_read_chunk_range()处理Read chunk段列表时偏移算术错误，跳过条件使用'>'而非'>='，长度计算未对段残差取上限，导致u32下溢并传递超大nr_bvec，可能造成错误DMA长度和大规模内存分配。
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-2026-89533 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-89533 补丁与修复 (7)
同批安全公告 · Linux · 2026-09-11 · 共 431 条
| CVE-2026-89688 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89655 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89658 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89660 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89659 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89662 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89669 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89674 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89675 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89676 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89677 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89681 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89686 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89703 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89479 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89478 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89702 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89482 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89708 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89712 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 431 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-89533
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