CVE-2024-49861— 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bpf程序中对只读映射的不当写入。
影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 57c3bb725a3dd97d960d7e1cd0845d88de53217f< 988e55abcf7fdb8fc9a76a7cf3f4e939a4d4fb3a |
affected |
57c3bb725a3dd97d960d7e1cd0845d88de53217f< a2c8dc7e21803257e762b0bf067fd13e9c995da0 |
affected | ||
57c3bb725a3dd97d960d7e1cd0845d88de53217f< 2ed98ee02d1e08afee88f54baec39ea78dc8a23c |
affected | ||
57c3bb725a3dd97d960d7e1cd0845d88de53217f< 1e75d25133158b525e0456876e9bcfd6b2993fd5 |
affected | ||
57c3bb725a3dd97d960d7e1cd0845d88de53217f< 32556ce93bc45c730829083cb60f95a2728ea48b |
affected | ||
5.2 |
affected | ||
< 5.2 |
unaffected | ||
6.1.120≤ 6.1.* |
unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2024-49861 基础信息
漏洞信息
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Vulnerability Title
bpf: Fix helper writes to read-only maps
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix helper writes to read-only maps
Lonial found an issue that despite user- and BPF-side frozen BPF map
(like in case of .rodata), it was still possible to write into it from
a BPF program side through specific helpers having ARG_PTR_TO_{LONG,INT}
as arguments.
In check_func_arg() when the argument is as mentioned, the meta->raw_mode
is never set. Later, check_helper_mem_access(), under the case of
PTR_TO_MAP_VALUE as register base type, it assumes BPF_READ for the
subsequent call to check_map_access_type() and given the BPF map is
read-only it succeeds.
The helpers really need to be annotated as ARG_PTR_TO_{LONG,INT} | MEM_UNINIT
when results are written into them as opposed to read out of them. The
latter indicates that it's okay to pass a pointer to uninitialized memory
as the memory is written to anyway.
However, ARG_PTR_TO_{LONG,INT} is a special case of ARG_PTR_TO_FIXED_SIZE_MEM
just with additional alignment requirement. So it is better to just get
rid of the ARG_PTR_TO_{LONG,INT} special cases altogether and reuse the
fixed size memory types. For this, add MEM_ALIGNED to additionally ensure
alignment given these helpers write directly into the args via *<ptr> = val.
The .arg*_size has been initialized reflecting the actual sizeof(*<ptr>).
MEM_ALIGNED can only be used in combination with MEM_FIXED_SIZE annotated
argument types, since in !MEM_FIXED_SIZE cases the verifier does not know
the buffer size a priori and therefore cannot blindly write *<ptr> = val.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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bpf程序中对只读映射的不当写入。
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-2024-49861 的公开POC
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|---|
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CVE-2024-49861 补丁与修复 (5)
同批安全公告 · Linux · 2024-10-21 · 共 372 条
| CVE-2022-48985 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-50033 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-49855 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49003 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-50043 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-47695 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-50047 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-50046 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-49996 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-47678 | 9.4 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49017 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49015 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-49950 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-49939 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50041 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-49936 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50029 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-49930 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-49988 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-49982 | 8.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 372 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2024-49861
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