CVE-2026-97952— sunvdc 描述符发送失败未映射LDC cookies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。
在 Linux 内核中，已修复以下漏洞： sunvdc：在描述符发送失败时取消映射 LDC cookies 函数会将请求的页面映射到 LDC（逻辑域通道）通道的映射表（通过 ），填充描述符，并在通过 触发门铃之前将其标记为 。当触发失败时，错误处理路径仅打印一条消息，而描述符仍保持 状态，且 cookies 永远不会被取消映射。 通常情况下，当对端完成描述符时，映射会在 中释放——但从未发送门铃的描述符永远不会被完成；此外，由于失败时未推进 ，重置路径（ ，遍历区间 ）也不会访问该描述符。因此，映射表条目会永久泄漏
可能的 ATT&CK 技术 1 AI
T1499.004 · Application or System Exploitation影响版本矩阵 28
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec< eb9c5f6747fe98b83c78cb5476a914e91d50e8e8 |
affected |
a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec< 24564576be423f3b5d7e67cd7df848ac66646497 |
affected | ||
a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec< 9251573e7cf7d797ae4a30b2a236af8242237a61 |
affected | ||
a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec< b0de6463667e9bb9dc14a83a9c24c1b6b3f7b5f7 |
affected | ||
a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec< ab81a5c1014a38dab0fb402609fd866b0bcb4726 |
affected | ||
a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec< 57835952566f0be9b365a6eb3a70b397a9d5ef47 |
affected | ||
a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec< f3322baa3a8ac87730feae952c1146269d78e098 |
affected | ||
a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec< 0c6da21fa35e03fc74f09895433ccd6d4a9c3530 |
affected | ||
| … +20 条更多 | |||
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一、 漏洞 CVE-2026-97952 基础信息
漏洞信息
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Vulnerability Title
sunvdc: unmap LDC cookies when the descriptor send fails
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
sunvdc: unmap LDC cookies when the descriptor send fails
__send_request() maps the request's pages into the LDC channel's map
table (ldc_map_sg()), fills in the descriptor and marks it
VIO_DESC_READY before ringing the doorbell via __vdc_tx_trigger().
When the trigger fails, the error path only prints a message: the
descriptor stays READY and the cookies are never unmapped. The
mapping is normally released in vdc_end_one() when the peer completes
the descriptor - but a descriptor whose doorbell was never sent will
never complete, and since dr->prod is not advanced on failure, the
reset path (vdc_requeue_inflight(), which walks [cons, prod)) never
visits it either. The map table entries are leaked permanently.
Since commit a11f6ca9aef9 ("sunvdc: Do not spin in an infinite loop
when vio_ldc_send() returns EAGAIN") trigger failures occur in
practice under load, so every resulting I/O error also leaks one
request's worth of entries from the fixed-size (8192 entries per
channel) map table. Because the allocator hands out contiguous
ranges, fragmentation makes large multi-segment requests fail first
as the table drains, until ldc_map_sg() fails permanently and the
disk is dead until reboot.
It also makes any retry-based recovery unusable: requeuing the
request on -EAGAIN remaps the pages on every attempt, overwriting
desc->cookies and orphaning the previous mapping, so the table
drains at the retry rate. This is the memory exhaustion observed
when the requeue approach was first tested in October 2025.
Roll back on failure: unmap the cookies, mark the descriptor FREE
again and clear the request entry. If the trigger failed with
-ENOTCONN, __vdc_tx_trigger() has already reset the port, which
tears down and reallocates both the dring and the LDC channel
including its map table - nothing to roll back, and the stale
descriptor must not be touched.
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
受影响产品
二、漏洞 CVE-2026-97952 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-97952 补丁与修复 (8)
同批安全公告 · Linux · 2026-09-25 · 共 372 条
| CVE-2026-100075 | 9.8 CRITICAL | RDMA/srpt：srpt_alloc_rw_ctxs() 未释放计数器修复 |
| CVE-2026-97555 | 8.8 HIGH | smb客户端：修复DACL所有者/组重写中的堆溢出漏洞 |
| CVE-2026-97957 | 8.8 HIGH | hinic 邮箱段缓冲区溢出漏洞 |
| CVE-2026-97527 | 8.8 HIGH | qla2xxx SCSI驱动程序 NVMe未解决上下文列表竞争条件漏洞 |
| CVE-2026-97528 | 8.8 HIGH | QLogic qla2xxx驱动LS拒绝错误NVMe内存泄漏漏洞 |
| CVE-2026-98115 | 8.8 HIGH | ksmbd 注销期间会话安全排空漏洞 |
| CVE-2026-97525 | 8.2 HIGH | x86/mm/pat：内核页表分裂页表分配漏洞 |
| CVE-2026-98069 | 8.1 HIGH | Net/RDS rds_conn_shutdown() 快速路径锁获取漏洞 |
| CVE-2026-97573 | 8.1 HIGH | bnxt_en 驱动 bnxt_rx_ring_reset 缓冲区分配失败漏洞 |
| CVE-2026-97570 | 8.1 HIGH | bnxt_en: 修复因SW TPA ID绑定问题导致的崩溃漏洞 |
| CVE-2026-98130 | 8.1 HIGH | SCTP定时器启动竞争条件漏洞 |
| CVE-2026-98070 | 8.1 HIGH | Linux RDS 模块远程代码执行漏洞 |
| CVE-2026-97941 | 7.8 HIGH | Linux 内核 slab 内存分配器竞态条件漏洞 |
| CVE-2026-97575 | 7.8 HIGH | v4l2-ctrls AV1瓦片计数验证漏洞 |
| CVE-2026-97576 | 7.8 HIGH | V4L2-ctrls HEVC 瓦片计数验证漏洞 |
| CVE-2026-98112 | 7.8 HIGH | ksmbd 网络接口事件中监听器任务生命周期修复漏洞 |
| CVE-2026-98002 | 7.8 HIGH | AMD IOMMU 嵌套域分配中错误检查失效漏洞 |
| CVE-2026-97937 | 7.8 HIGH | Linux内核ftrace远程代码执行漏洞 |
| CVE-2026-97580 | 7.8 HIGH | rkvdec HEVC解析数组越界漏洞 |
| CVE-2026-97940 | 7.8 HIGH | IPv6 修复 fib6 遍历器在 seq 停止时存在 UAF 漏洞 |
显示前 20 条，共 372 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-97952
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