CVE-2022-48910— 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，该漏洞源于在网络接口启用和禁用IPv6时可能重复调用ipv6_mc_down函数，造成内存泄漏。
可能的 ATT&CK 技术 1 AI
T1496 · Resource Hijacking影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 3ce62a84d53cd3d3cc5377bbf339e9b08ddf9c36< 9a8736b2da28b24f01707f592ff059b9f90a058c |
affected |
3ce62a84d53cd3d3cc5377bbf339e9b08ddf9c36< c71bf3229f9e9dd60ba02f5a5be02066edf57012 |
affected | ||
3ce62a84d53cd3d3cc5377bbf339e9b08ddf9c36< 24888915364cfa410de62d8abb5df95c3b67455d |
affected | ||
3ce62a84d53cd3d3cc5377bbf339e9b08ddf9c36< 9588ac2eddc2f223ebcebf6e9f5caed84d32922b |
affected | ||
3ce62a84d53cd3d3cc5377bbf339e9b08ddf9c36< f4c63b24dea9cc2043ff845dcca9aaf8109ea38a |
affected | ||
3ce62a84d53cd3d3cc5377bbf339e9b08ddf9c36< b11781515208dd31fbcd0b664078dce5dc44523f |
affected | ||
3ce62a84d53cd3d3cc5377bbf339e9b08ddf9c36< 72124e65a70b84e6303a5cd21b0ac1f27d7d61a4 |
affected | ||
3ce62a84d53cd3d3cc5377bbf339e9b08ddf9c36< 9995b408f17ff8c7f11bc725c8aa225ba3a63b1c |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2022-48910 基础信息
漏洞信息
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Vulnerability Title
net: ipv6: ensure we call ipv6_mc_down() at most once
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net: ipv6: ensure we call ipv6_mc_down() at most once
There are two reasons for addrconf_notify() to be called with NETDEV_DOWN:
either the network device is actually going down, or IPv6 was disabled
on the interface.
If either of them stays down while the other is toggled, we repeatedly
call the code for NETDEV_DOWN, including ipv6_mc_down(), while never
calling the corresponding ipv6_mc_up() in between. This will cause a
new entry in idev->mc_tomb to be allocated for each multicast group
the interface is subscribed to, which in turn leaks one struct ifmcaddr6
per nontrivial multicast group the interface is subscribed to.
The following reproducer will leak at least $n objects:
ip addr add ff2e::4242/32 dev eth0 autojoin
sysctl -w net.ipv6.conf.eth0.disable_ipv6=1
for i in $(seq 1 $n); do
ip link set up eth0; ip link set down eth0
done
Joining groups with IPV6_ADD_MEMBERSHIP (unprivileged) or setting the
sysctl net.ipv6.conf.eth0.forwarding to 1 (=> subscribing to ff02::2)
can also be used to create a nontrivial idev->mc_list, which will the
leak objects with the right up-down-sequence.
Based on both sources for NETDEV_DOWN events the interface IPv6 state
should be considered:
- not ready if the network interface is not ready OR IPv6 is disabled
for it
- ready if the network interface is ready AND IPv6 is enabled for it
The functions ipv6_mc_up() and ipv6_down() should only be run when this
state changes.
Implement this by remembering when the IPv6 state is ready, and only
run ipv6_mc_down() if it actually changed from ready to not ready.
The other direction (not ready -> ready) already works correctly, as:
- the interface notification triggered codepath for NETDEV_UP /
NETDEV_CHANGE returns early if ipv6 is disabled, and
- the disable_ipv6=0 triggered codepath skips fully initializing the
interface as long as addrconf_link_ready(dev) returns false
- calling ipv6_mc_up() repeatedly does not leak anything
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，该漏洞源于在网络接口启用和禁用IPv6时可能重复调用ipv6_mc_down函数，造成内存泄漏。
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-2022-48910 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2022-48910 补丁与修复 (1)
CVE-2022-48910 其他参考 (7)
同批安全公告 · Linux · 2024-08-22 · 共 42 条
| CVE-2022-48941 | 8.8 HIGH | Linux kernel 竞争条件问题漏洞 |
| CVE-2022-48919 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48925 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48923 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48927 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48913 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48912 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48911 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48932 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48935 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48940 | 7.8 HIGH | Linux kernel 缓冲区错误漏洞 |
| CVE-2022-48943 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-48933 | Linux kernel 安全漏洞 | |
| CVE-2022-48934 | Linux kernel 安全漏洞 | |
| CVE-2022-48937 | Linux kernel 安全漏洞 | |
| CVE-2022-48931 | Linux kernel 安全漏洞 | |
| CVE-2022-48930 | Linux kernel 安全漏洞 | |
| CVE-2022-48929 | Linux kernel 安全漏洞 | |
| CVE-2022-48928 | Linux kernel 安全漏洞 | |
| CVE-2022-48938 | Linux kernel 输入验证错误漏洞 |
显示前 20 条，共 42 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2022-48910
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