CVE-2026-74577— net:mpls在mpls_getroute()中初始化rtm_tos
影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 397fc9e5cefee0c33b86811fbddb0decb7288c52< 95651461cf77cc6590fa08c87667717e5dcfa55d | affected |
397fc9e5cefee0c33b86811fbddb0decb7288c52< 1fea5ff0eb4aa7e951bb3d380248566c473aa377 | affected | ||
397fc9e5cefee0c33b86811fbddb0decb7288c52< a5cdd2407dd890f741f59b8367e4c6c101cce154 | affected | ||
397fc9e5cefee0c33b86811fbddb0decb7288c52< 2dc2fffc704a4365cae1aae078ba62223aaeff93 | affected | ||
397fc9e5cefee0c33b86811fbddb0decb7288c52< 295dd295e2137e10e9a5b1891d97e0f08de76f03 | affected | ||
4.13 | affected | ||
< 4.13 | unaffected | ||
6.6.151≤ 6.6.* | unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2026-74577 基础信息
漏洞信息
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Vulnerability Title
net: mpls: initialize rtm_tos in mpls_getroute()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: mpls: initialize rtm_tos in mpls_getroute() mpls_getroute() builds the RTM_NEWROUTE reply to an RTM_GETROUTE request by filling a struct rtmsg allocated from an skb whose data area is not zeroed (alloc_skb(NLMSG_GOODSIZE, ...)). It sets every field of the header except rtm_tos: r = nlmsg_data(nlh); r->rtm_family = AF_MPLS; r->rtm_dst_len = 20; r->rtm_src_len = 0; r->rtm_table = RT_TABLE_MAIN; r->rtm_type = RTN_UNICAST; r->rtm_scope = RT_SCOPE_UNIVERSE; r->rtm_protocol = rt->rt_protocol; r->rtm_flags = 0; struct rtmsg has no padding, so the one uninitialised byte rtm_tos (offset 3) is copied straight to user space on recvmsg(), leaking a byte of uninitialised heap memory. This is in contrast to mpls_dump_route(), which fills the very same header and does set rtm_tos = 0. Initialize rtm_tos to 0, matching mpls_dump_route(). Reproduced with KMSAN by adding an MPLS route and issuing a non-RTM_F_FIB_MATCH RTM_GETROUTE for its label: BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x36c/0x33f0 _copy_to_iter+0x36c/0x33f0 __skb_datagram_iter+0x196/0x12c0 skb_copy_datagram_iter+0x5b/0x210 netlink_recvmsg+0x37b/0xef0 ... Uninit was created at: __alloc_skb+0x8ca/0x10e0 mpls_getroute+0x1280/0x3a40 rtnetlink_rcv_msg+0x1138/0x15a0 ... Byte 19 of 64 is uninitialized (byte 19 = nlmsghdr(16) + rtmsg offset 3 = rtm_tos)
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
受影响产品
二、漏洞 CVE-2026-74577 的公开POC
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CVE-2026-74577 补丁与修复 (4)
同批安全公告 · Linux · 2026-08-15 · 共 848 条
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| CVE-2026-72266 | vesafb: vesafb_probe() 内存泄漏漏洞 | |
| CVE-2026-72265 | NVIDIA fbdev 驱动 nvidiafb_probe 内存泄漏漏洞 | |
| CVE-2026-72264 | tridentfb：trident_pci_probe() 潜在内存泄漏 | |
| CVE-2026-72262 | ASoC: SOF: bytes_ext 堆溢出漏洞 | |
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| CVE-2026-72261 | ASoC SOF ipc3-control 验证 snd_sof_update_control 中的大小 | |
| CVE-2026-72260 | Mediatek MT8192 SoC驱动运行时恢复检查漏洞 | |
| CVE-2026-72259 | mediatek mt8192 资源释放漏洞 | |
| CVE-2026-72258 | MT8183内存清理释放漏洞 | |
| CVE-2026-72256 | netfilter xt_cluster 哈希匹配中拒绝模板连接跟踪漏洞 | |
| CVE-2026-72257 | qcom q6apm NULL指针解引用漏洞 | |
| CVE-2026-72245 | host1x: host1x_device_parse_dt() 设备引用泄露漏洞 | |
| CVE-2026-72248 | netfilter flowtable IPIP隧道直接转发漏洞 | |
| CVE-2026-72247 | Linux内核 nf_conncount 连接数模块元组去重时区域比较逻辑错误漏洞 | |
| CVE-2026-72246 | netfilter flowtable 隧道路由方向设置错误漏洞 | |
| CVE-2026-72249 | netfilter flowtable IPIP头部推送方向目标地址使用漏洞 | |
| CVE-2026-72244 | gpu/buddy：对齐失败时终止try_harder |
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IV. Related Vulnerabilities
V. Comments for CVE-2026-74577
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