CVE-2026-43388— 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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于damos_walk在上下文不活跃时未清除walk_control，可能导致释放后重用或永久EBUSY。
可能的 ATT&CK 技术 1 AI
T1070 · Indicator Removal影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61< ce0aa47c963b8c3e5beace89e2b5a665a64b5b6b |
affected |
bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61< 9320c77134ab8d7701e20608bbf08517df4fa321 |
affected | ||
bf0eaba0ff9c9c8e6fd58ddfa1a8b6df4b813f61< d210fdcac9c0d1380eab448aebc93f602c1cd4e6 |
affected | ||
6.14 |
affected | ||
< 6.14 |
unaffected | ||
6.18.19≤ 6.18.* |
unaffected | ||
6.19.9≤ 6.19.* |
unaffected | ||
7.0≤ * |
unaffected |
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一、 漏洞 CVE-2026-43388 基础信息
漏洞信息
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Vulnerability Title
mm/damon/core: clear walk_control on inactive context in damos_walk()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
mm/damon/core: clear walk_control on inactive context in damos_walk()
damos_walk() sets ctx->walk_control to the caller-provided control
structure before checking whether the context is running. If the context
is inactive (damon_is_running() returns false), the function returns
-EINVAL without clearing ctx->walk_control. This leaves a dangling
pointer to a stack-allocated structure that will be freed when the caller
returns.
This is structurally identical to the bug fixed in commit f9132fbc2e83
("mm/damon/core: remove call_control in inactive contexts") for
damon_call(), which had the same pattern of linking a control object and
returning an error without unlinking it.
The dangling walk_control pointer can cause:
1. Use-after-free if the context is later started and kdamond
dereferences ctx->walk_control (e.g., in damos_walk_cancel()
which writes to control->canceled and calls complete())
2. Permanent -EBUSY from subsequent damos_walk() calls, since the
stale pointer is non-NULL
Nonetheless, the real user impact is quite restrictive. The
use-after-free is impossible because there is no damos_walk() callers who
starts the context later. The permanent -EBUSY can actually confuse
users, as DAMON is not running. But the symptom is kept only while the
context is turned off. Turning it on again will make DAMON internally
uses a newly generated damon_ctx object that doesn't have the invalid
damos_walk_control pointer, so everything will work fine again.
Fix this by clearing ctx->walk_control under walk_control_lock before
returning -EINVAL, mirroring the fix pattern from f9132fbc2e83.
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于damos_walk在上下文不活跃时未清除walk_control，可能导致释放后重用或永久EBUSY。
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-2026-43388 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-43388 补丁与修复 (3)
同批安全公告 · Linux · 2026-05-08 · 共 197 条
| CVE-2026-43384 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43341 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43304 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43379 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43414 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43378 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43465 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43402 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43376 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43383 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43406 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43407 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43403 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43334 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43284 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43322 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43391 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43291 | 8.3 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43466 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43365 | 8.2 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 197 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-43388
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