CVE-2024-42245— 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 sched/fair 模块负载均衡逻辑变更导致在所有任务都被固定时忽略env.max_loop，这可能导致detach_tasks中的O(n)迭代，从而容易触发硬锁。
可能的 ATT&CK 技术 1 AI
T1499 · Endpoint Denial of Service影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | b0defa7ae03ecf91b8bfd10ede430cff12fcbd06< d467194018dd536fe6c65a2fd3aedfcdb1424903 |
affected |
b0defa7ae03ecf91b8bfd10ede430cff12fcbd06< 1e116c18e32b035a2d1bd460800072c8bf96bc44 |
affected | ||
b0defa7ae03ecf91b8bfd10ede430cff12fcbd06< 0fa6dcbfa2e2b97c1e6febbea561badf0931a38b |
affected | ||
b0defa7ae03ecf91b8bfd10ede430cff12fcbd06< 2feab2492deb2f14f9675dd6388e9e2bf669c27a |
affected | ||
6.1 |
affected | ||
< 6.1 |
unaffected | ||
6.1.100≤ 6.1.* |
unaffected | ||
6.6.41≤ 6.6.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2024-42245 基础信息
漏洞信息
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Vulnerability Title
Revert "sched/fair: Make sure to try to detach at least one movable task"
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
Revert "sched/fair: Make sure to try to detach at least one movable task"
This reverts commit b0defa7ae03ecf91b8bfd10ede430cff12fcbd06.
b0defa7ae03ec changed the load balancing logic to ignore env.max_loop if
all tasks examined to that point were pinned. The goal of the patch was
to make it more likely to be able to detach a task buried in a long list
of pinned tasks. However, this has the unfortunate side effect of
creating an O(n) iteration in detach_tasks(), as we now must fully
iterate every task on a cpu if all or most are pinned. Since this load
balance code is done with rq lock held, and often in softirq context, it
is very easy to trigger hard lockups. We observed such hard lockups with
a user who affined O(10k) threads to a single cpu.
When I discussed this with Vincent he initially suggested that we keep
the limit on the number of tasks to detach, but increase the number of
tasks we can search. However, after some back and forth on the mailing
list, he recommended we instead revert the original patch, as it seems
likely no one was actually getting hit by the original issue.
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 sched/fair 模块负载均衡逻辑变更导致在所有任务都被固定时忽略env.max_loop，这可能导致detach_tasks中的O(n)迭代，从而容易触发硬锁。
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-2024-42245 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-42245 补丁与修复 (2)
同批安全公告 · Linux · 2024-08-07 · 共 19 条
| CVE-2024-42232 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-42249 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42234 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42233 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42235 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42236 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42250 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42247 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-42240 | Linux kernel 安全漏洞 | |
| CVE-2024-42237 | Linux kernel 安全漏洞 | |
| CVE-2024-42238 | Linux kernel 安全漏洞 | |
| CVE-2024-42239 | Linux kernel 安全漏洞 | |
| CVE-2024-42242 | Linux kernel 安全漏洞 | |
| CVE-2024-42241 | Linux kernel 安全漏洞 | |
| CVE-2024-42244 | Linux kernel 安全漏洞 | |
| CVE-2024-42243 | Linux kernel 安全漏洞 | |
| CVE-2024-42246 | Linux kernel 安全漏洞 | |
| CVE-2024-42248 | Linux kernel 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2024-42245
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