CVE-2026-64527— 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基金会开源的一款操作系统内核。 Linux kernel 5.14版本存在安全漏洞，该漏洞源于VMBus数据包大小验证不足，可能导致攻击者读取先前消息的残留数据，造成信息泄露。
可能的 ATT&CK 技术 1 AI
T1115 · Clipboard Data影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 76c56a5affeba1e163b66b9d8cc192e6154466f0< 57d5d697642e05d5dd2d40660817765943dd709f |
affected |
76c56a5affeba1e163b66b9d8cc192e6154466f0< f5251226551bfec98c4705641b6f94ff1f238d91 |
affected | ||
76c56a5affeba1e163b66b9d8cc192e6154466f0< 049a6b474823049fe60212f25f26e4b30f44ee8f |
affected | ||
76c56a5affeba1e163b66b9d8cc192e6154466f0< 588c84b461393ff1998ac7b97b04f953f642e0df |
affected | ||
76c56a5affeba1e163b66b9d8cc192e6154466f0< 164dc7bf17609340233c6bf4f66bb7c7008a0511 |
affected | ||
76c56a5affeba1e163b66b9d8cc192e6154466f0< c8974d96b6a5496f33dc69a3ce28a7bf5078def4 |
affected | ||
76c56a5affeba1e163b66b9d8cc192e6154466f0< 7f87763f47a3c22fb50265a00619ef10f2394b18 |
affected | ||
5.14 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2026-64527 基础信息
漏洞信息
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Vulnerability Title
drm/hyperv: validate VMBus packet size in receive callback
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
drm/hyperv: validate VMBus packet size in receive callback
hyperv_receive_sub() reads msg->vid_hdr.type and dispatches into one
of four message-type branches without knowing how many bytes the host
wrote into hv->recv_buf. The completion path then runs
memcpy(hv->init_buf, msg, VMBUS_MAX_PACKET_SIZE), so the consumer that
wakes on wait_for_completion_timeout() can read up to 16 KiB of
residue from a prior message as if it were the response payload.
Pass bytes_recvd into hyperv_receive_sub() and reject any packet that
does not cover the pipe + synthvid header. A single switch on
msg->vid_hdr.type then computes the type-specific payload size: the
three completion-driving types (SYNTHVID_VERSION_RESPONSE,
SYNTHVID_RESOLUTION_RESPONSE, SYNTHVID_VRAM_LOCATION_ACK) fall through
to a shared exit that requires that size before memcpy/complete, while
SYNTHVID_FEATURE_CHANGE validates its own payload and returns before
reading is_dirt_needed. Unknown types are dropped.
SYNTHVID_RESOLUTION_RESPONSE is variable length: the host fills
resolution_count entries, not the full SYNTHVID_MAX_RESOLUTION_COUNT
array. Validate the fixed prefix first so resolution_count can be
read, bound it against the array, then require only the count-sized
array, so the shorter responses the host actually sends are accepted.
Only run the sub-handler when vmbus_recvpacket() returned success. The
memcpy length is bytes_recvd, which is bounded by VMBUS_MAX_PACKET_SIZE
only on a successful receive; on -ENOBUFS vmbus_recvpacket() instead
reports the required length, which can exceed hv->recv_buf, so copying
bytes_recvd would read and write past the 16 KiB buffers. Gating on the
success return keeps the copy bounded. The nonzero-return path is itself
a malformed-message case and is now logged rather than silently skipped;
channel recovery is not attempted.
Rejected packets are reported via drm_err_ratelimited() rather than
silently dropped, matching the CoCo-hardened pattern in
hv_kvp_onchannelcallback().
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基金会开源的一款操作系统内核。 Linux kernel 5.14版本存在安全漏洞，该漏洞源于VMBus数据包大小验证不足，可能导致攻击者读取先前消息的残留数据，造成信息泄露。
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-2026-64527 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
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CVE-2026-64527 补丁与修复 (6)
同批安全公告 · Linux · 2026-07-25 · 共 274 条
| CVE-2026-64391 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64268 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64384 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64383 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64385 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64386 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64387 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64439 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64303 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64355 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64459 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64399 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64410 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64523 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64397 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64320 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64319 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64269 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64393 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64392 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 274 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-64527
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