CVE-2026-43363— 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，该漏洞源于恢复时x2apic模式未按预期禁用，可能导致系统挂起。
可能的 ATT&CK 技术 1 AI
T1620 · Reflective Code Loading影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 6e1cb38a2aef7680975e71f23de187859ee8b158< a6ad6f2e31b524cbb66b2f370bad0cf17d327e6c |
affected |
6e1cb38a2aef7680975e71f23de187859ee8b158< 3dd0812a7c764cd8f3b0182441ac22da0a7f3b09 |
affected | ||
6e1cb38a2aef7680975e71f23de187859ee8b158< 965289b120cc68cca886c75219c68b8c15751d73 |
affected | ||
6e1cb38a2aef7680975e71f23de187859ee8b158< f591938072115bf08730b8530c67fab189cc6308 |
affected | ||
6e1cb38a2aef7680975e71f23de187859ee8b158< 1a85f84214f9d790216547ac6086bf8033cd9e5a |
affected | ||
6e1cb38a2aef7680975e71f23de187859ee8b158< 11712c4eb384098db4cb08792e223c818b908c1a |
affected | ||
6e1cb38a2aef7680975e71f23de187859ee8b158< 1d8440c1e7c49715f937416ac90cf260f1f1712c |
affected | ||
6e1cb38a2aef7680975e71f23de187859ee8b158< 8cc7dd77a1466f0ec58c03478b2e735a5b289b96 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-43363 基础信息
漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
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Vulnerability Title
x86/apic: Disable x2apic on resume if the kernel expects so
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
x86/apic: Disable x2apic on resume if the kernel expects so
When resuming from s2ram, firmware may re-enable x2apic mode, which may have
been disabled by the kernel during boot either because it doesn't support IRQ
remapping or for other reasons. This causes the kernel to continue using the
xapic interface, while the hardware is in x2apic mode, which causes hangs.
This happens on defconfig + bare metal + s2ram.
Fix this in lapic_resume() by disabling x2apic if the kernel expects it to be
disabled, i.e. when x2apic_mode = 0.
The ACPI v6.6 spec, Section 16.3 [1] says firmware restores either the
pre-sleep configuration or initial boot configuration for each CPU, including
MSR state:
When executing from the power-on reset vector as a result of waking from an
S2 or S3 sleep state, the platform firmware performs only the hardware
initialization required to restore the system to either the state the
platform was in prior to the initial operating system boot, or to the
pre-sleep configuration state. In multiprocessor systems, non-boot
processors should be placed in the same state as prior to the initial
operating system boot.
(further ahead)
If this is an S2 or S3 wake, then the platform runtime firmware restores
minimum context of the system before jumping to the waking vector. This
includes:
CPU configuration. Platform runtime firmware restores the pre-sleep
configuration or initial boot configuration of each CPU (MSR, MTRR,
firmware update, SMBase, and so on). Interrupts must be disabled (for
IA-32 processors, disabled by CLI instruction).
(and other things)
So at least as per the spec, re-enablement of x2apic by the firmware is
allowed if "x2apic on" is a part of the initial boot configuration.
[1] https://uefi.org/specs/ACPI/6.6/16_Waking_and_Sleeping.html#initialization
[ bp: Massage. ]
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，该漏洞源于恢复时x2apic模式未按预期禁用，可能导致系统挂起。
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-2026-43363 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
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CVE-2026-43363 补丁与修复 (8)
同批安全公告 · Linux · 2026-05-08 · 共 197 条
| CVE-2026-43341 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43402 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43414 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43384 | 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-2026-43376 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43465 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-43378 | 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-2026-43284 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43334 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43322 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43403 | 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-2026-43365 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-43466 | 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-2026-43363
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