CVE-2024-56702— 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子系统中对raw tracepoint参数的错误处理，导致内核崩溃。
可能的 ATT&CK 技术 1 AI
T1059 · Command and Scripting Interpreter影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 3f00c52393445ed49aadc1a567aa502c6333b1a1< c9b91d2d54175f781ad2c361cb2ac2c0e29b14b6 |
affected |
3f00c52393445ed49aadc1a567aa502c6333b1a1< 3634d4a310820567fc634bf8f1ee2b91378773e8 |
affected | ||
3f00c52393445ed49aadc1a567aa502c6333b1a1< cb4158ce8ec8a5bb528cc1693356a5eb8058094d |
affected | ||
6.2 |
affected | ||
< 6.2 |
unaffected | ||
6.11.11≤ 6.11.* |
unaffected | ||
6.12.2≤ 6.12.* |
unaffected | ||
6.13≤ * |
unaffected |
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一、 漏洞 CVE-2024-56702 基础信息
漏洞信息
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Vulnerability Title
bpf: Mark raw_tp arguments with PTR_MAYBE_NULL
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
bpf: Mark raw_tp arguments with PTR_MAYBE_NULL
Arguments to a raw tracepoint are tagged as trusted, which carries the
semantics that the pointer will be non-NULL. However, in certain cases,
a raw tracepoint argument may end up being NULL. More context about this
issue is available in [0].
Thus, there is a discrepancy between the reality, that raw_tp arguments
can actually be NULL, and the verifier's knowledge, that they are never
NULL, causing explicit NULL checks to be deleted, and accesses to such
pointers potentially crashing the kernel.
To fix this, mark raw_tp arguments as PTR_MAYBE_NULL, and then special
case the dereference and pointer arithmetic to permit it, and allow
passing them into helpers/kfuncs; these exceptions are made for raw_tp
programs only. Ensure that we don't do this when ref_obj_id > 0, as in
that case this is an acquired object and doesn't need such adjustment.
The reason we do mask_raw_tp_trusted_reg logic is because other will
recheck in places whether the register is a trusted_reg, and then
consider our register as untrusted when detecting the presence of the
PTR_MAYBE_NULL flag.
To allow safe dereference, we enable PROBE_MEM marking when we see loads
into trusted pointers with PTR_MAYBE_NULL.
While trusted raw_tp arguments can also be passed into helpers or kfuncs
where such broken assumption may cause issues, a future patch set will
tackle their case separately, as PTR_TO_BTF_ID (without PTR_TRUSTED) can
already be passed into helpers and causes similar problems. Thus, they
are left alone for now.
It is possible that these checks also permit passing non-raw_tp args
that are trusted PTR_TO_BTF_ID with null marking. In such a case,
allowing dereference when pointer is NULL expands allowed behavior, so
won't regress existing programs, and the case of passing these into
helpers is the same as above and will be dealt with later.
Also update the failure case in tp_btf_nullable selftest to capture the
new behavior, as the verifier will no longer cause an error when
directly dereference a raw tracepoint argument marked as __nullable.
[0]: https://lore.kernel.org/bpf/ZrCZS6nisraEqehw@jlelli-thinkpadt14gen4.remote.csb
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bpf子系统中对raw tracepoint参数的错误处理，导致内核崩溃。
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-2024-56702 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-56702 补丁与修复 (3)
同批安全公告 · Linux · 2024-12-28 · 共 32 条
| CVE-2024-56704 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56684 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56677 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56706 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56692 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56693 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56681 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56688 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56703 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56694 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56708 | Linux kernel 安全漏洞 | |
| CVE-2024-56682 | Linux kernel 安全漏洞 | |
| CVE-2024-56707 | Linux kernel 安全漏洞 | |
| CVE-2024-56705 | Linux kernel 安全漏洞 | |
| CVE-2024-56676 | Linux kernel 安全漏洞 | |
| CVE-2024-56678 | Linux kernel 安全漏洞 | |
| CVE-2024-56701 | Linux kernel 安全漏洞 | |
| CVE-2024-56700 | Linux kernel 安全漏洞 | |
| CVE-2024-56699 | Linux kernel 安全漏洞 | |
| CVE-2024-56698 | Linux kernel 安全漏洞 |
显示前 20 条，共 32 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2024-56702
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