CVE-2024-50182— 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，该漏洞源于无法直接映射时memfd_secret函数调用问题。
可能的 ATT&CK 技术 1 AI
T1134 · Access Token Manipulation影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49< d0ae6ffa1aeb297aef89f49cfb894a83c329ebad |
affected |
1507f51255c9ff07d75909a84e7c0d7f3c4b2f49< 5ea0b7af38754d2b45ead9257bca47e84662e926 |
affected | ||
1507f51255c9ff07d75909a84e7c0d7f3c4b2f49< 7caf966390e6e4ebf42775df54e7ee1f280ce677 |
affected | ||
1507f51255c9ff07d75909a84e7c0d7f3c4b2f49< 757786abe4547eb3d9d0e8350a63bdb0f9824af2 |
affected | ||
1507f51255c9ff07d75909a84e7c0d7f3c4b2f49< 532b53cebe58f34ce1c0f34d866f5c0e335c53c6 |
affected | ||
5.14 |
affected | ||
< 5.14 |
unaffected | ||
5.15.169≤ 5.15.* |
unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2024-50182 基础信息
漏洞信息
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Vulnerability Title
secretmem: disable memfd_secret() if arch cannot set direct map
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
secretmem: disable memfd_secret() if arch cannot set direct map
Return -ENOSYS from memfd_secret() syscall if !can_set_direct_map(). This
is the case for example on some arm64 configurations, where marking 4k
PTEs in the direct map not present can only be done if the direct map is
set up at 4k granularity in the first place (as ARM's break-before-make
semantics do not easily allow breaking apart large/gigantic pages).
More precisely, on arm64 systems with !can_set_direct_map(),
set_direct_map_invalid_noflush() is a no-op, however it returns success
(0) instead of an error. This means that memfd_secret will seemingly
"work" (e.g. syscall succeeds, you can mmap the fd and fault in pages),
but it does not actually achieve its goal of removing its memory from the
direct map.
Note that with this patch, memfd_secret() will start erroring on systems
where can_set_direct_map() returns false (arm64 with
CONFIG_RODATA_FULL_DEFAULT_ENABLED=n, CONFIG_DEBUG_PAGEALLOC=n and
CONFIG_KFENCE=n), but that still seems better than the current silent
failure. Since CONFIG_RODATA_FULL_DEFAULT_ENABLED defaults to 'y', most
arm64 systems actually have a working memfd_secret() and aren't be
affected.
From going through the iterations of the original memfd_secret patch
series, it seems that disabling the syscall in these scenarios was the
intended behavior [1] (preferred over having
set_direct_map_invalid_noflush return an error as that would result in
SIGBUSes at page-fault time), however the check for it got dropped between
v16 [2] and v17 [3], when secretmem moved away from CMA allocations.
[1]: https://lore.kernel.org/lkml/20201124164930.GK8537@kernel.org/
[2]: https://lore.kernel.org/lkml/20210121122723.3446-11-rppt@kernel.org/#t
[3]: https://lore.kernel.org/lkml/20201125092208.12544-10-rppt@kernel.org/
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:N
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，该漏洞源于无法直接映射时memfd_secret函数调用问题。
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-2024-50182 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-50182 补丁与修复 (4)
同批安全公告 · Linux · 2024-11-08 · 共 38 条
| CVE-2024-50206 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-50185 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50174 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50211 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50208 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50207 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50203 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50200 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50189 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50188 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50187 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50173 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50175 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50186 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50195 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50199 | Linux kernel 安全漏洞 | |
| CVE-2024-50210 | Linux kernel 安全漏洞 | |
| CVE-2024-50176 | Linux kernel 安全漏洞 | |
| CVE-2024-50209 | Linux kernel 安全漏洞 | |
| CVE-2024-50177 | Linux kernel 安全漏洞 |
显示前 20 条，共 38 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2024-50182
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