CVE-2022-49812— 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，该漏洞源于桥接switchdev中VLAN协议变更导致内存泄漏，可能导致资源泄漏。
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 279737939a8194f02fa352ab4476a1b241f44ef4< 347f1793b573466424c550f2748ed837b6690fe7 |
affected |
279737939a8194f02fa352ab4476a1b241f44ef4< fc16a2c81a3eb1cbba8775f5bdc67856df903a7c |
affected | ||
279737939a8194f02fa352ab4476a1b241f44ef4< f8926e2d2225eb7b7e11cd3fa266aaad9075b767 |
affected | ||
279737939a8194f02fa352ab4476a1b241f44ef4< 9d45921ee4cb364910097e7d1b7558559c2f9fd2 |
affected | ||
5.0 |
affected | ||
< 5.0 |
unaffected | ||
5.10.157≤ 5.10.* |
unaffected | ||
5.15.80≤ 5.15.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2022-49812 基础信息
漏洞信息
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Vulnerability Title
bridge: switchdev: Fix memory leaks when changing VLAN protocol
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
bridge: switchdev: Fix memory leaks when changing VLAN protocol
The bridge driver can offload VLANs to the underlying hardware either
via switchdev or the 8021q driver. When the former is used, the VLAN is
marked in the bridge driver with the 'BR_VLFLAG_ADDED_BY_SWITCHDEV'
private flag.
To avoid the memory leaks mentioned in the cited commit, the bridge
driver will try to delete a VLAN via the 8021q driver if the VLAN is not
marked with the previously mentioned flag.
When the VLAN protocol of the bridge changes, switchdev drivers are
notified via the 'SWITCHDEV_ATTR_ID_BRIDGE_VLAN_PROTOCOL' attribute, but
the 8021q driver is also called to add the existing VLANs with the new
protocol and delete them with the old protocol.
In case the VLANs were offloaded via switchdev, the above behavior is
both redundant and buggy. Redundant because the VLANs are already
programmed in hardware and drivers that support VLAN protocol change
(currently only mlx5) change the protocol upon the switchdev attribute
notification. Buggy because the 8021q driver is called despite these
VLANs being marked with 'BR_VLFLAG_ADDED_BY_SWITCHDEV'. This leads to
memory leaks [1] when the VLANs are deleted.
Fix by not calling the 8021q driver for VLANs that were already
programmed via switchdev.
[1]
unreferenced object 0xffff8881f6771200 (size 256):
comm "ip", pid 446855, jiffies 4298238841 (age 55.240s)
hex dump (first 32 bytes):
00 00 7f 0e 83 88 ff ff 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000012819ac>] vlan_vid_add+0x437/0x750
[<00000000f2281fad>] __br_vlan_set_proto+0x289/0x920
[<000000000632b56f>] br_changelink+0x3d6/0x13f0
[<0000000089d25f04>] __rtnl_newlink+0x8ae/0x14c0
[<00000000f6276baf>] rtnl_newlink+0x5f/0x90
[<00000000746dc902>] rtnetlink_rcv_msg+0x336/0xa00
[<000000001c2241c0>] netlink_rcv_skb+0x11d/0x340
[<0000000010588814>] netlink_unicast+0x438/0x710
[<00000000e1a4cd5c>] netlink_sendmsg+0x788/0xc40
[<00000000e8992d4e>] sock_sendmsg+0xb0/0xe0
[<00000000621b8f91>] ____sys_sendmsg+0x4ff/0x6d0
[<000000000ea26996>] ___sys_sendmsg+0x12e/0x1b0
[<00000000684f7e25>] __sys_sendmsg+0xab/0x130
[<000000004538b104>] do_syscall_64+0x3d/0x90
[<0000000091ed9678>] entry_SYSCALL_64_after_hwframe+0x46/0xb0
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，该漏洞源于桥接switchdev中VLAN协议变更导致内存泄漏，可能导致资源泄漏。
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-2022-49812 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2022-49812 补丁与修复 (4)
同批安全公告 · Linux · 2025-05-01 · 共 245 条
| CVE-2025-37750 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-37778 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49770 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-49931 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37776 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37777 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37790 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49910 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49886 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-23159 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37749 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37774 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37789 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37779 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49920 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-49919 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37756 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37761 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-37763 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-23141 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 245 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2022-49812
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