CVE-2026-89780— Qualcomm rmnet 去聚合帧 skb->dev 恢复漏洞
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。
In the Linux kernel, the following vulnerability has been resolved: net: qualcomm: rmnet: restore skb->dev on deaggregated frames rmnet_map_deaggregate() allocates each sub-frame with alloc_skb() and leaves skb->dev NULL. __rmnet_map_ingress_handler() assigns
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一、 漏洞 CVE-2026-89780 基础信息
漏洞信息
尽管我们使用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性，但请您根据实际情况进行核实和判断。
Vulnerability Title
net: qualcomm: rmnet: restore skb->dev on deaggregated frames
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net: qualcomm: rmnet: restore skb->dev on deaggregated frames
rmnet_map_deaggregate() allocates each sub-frame with alloc_skb() and
leaves skb->dev NULL. __rmnet_map_ingress_handler() assigns
skb->dev = ep->egress_dev only on the data path, but a MAP command frame
is dispatched to rmnet_map_command() before that, so rmnet_map_send_ack()
runs netif_tx_lock(skb->dev) on a NULL device. An unprivileged user
reaches this by unsharing a user+net namespace, creating an rmnet link
over a tap device with INGRESS_DEAGGREGATION and INGRESS_MAP_COMMANDS,
and writing an aggregated frame carrying a flow-control command to the
tap fd.
Restore the assignment dropped by 378e25357ac7, so every skb leaving
rmnet_map_deaggregate() has a valid device.
BUG: KASAN: null-ptr-deref in _raw_spin_lock (kernel/locking/spinlock.c:158)
Write of size 4 at addr 00000000000004b4 by task exploit/144
Call Trace:
_raw_spin_lock (kernel/locking/spinlock.c:158)
netif_tx_lock (net/sched/sch_generic.c:497)
rmnet_map_command (drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c:67)
rmnet_rx_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:125)
__netif_receive_skb_core.constprop.0 (net/core/dev.c:6103)
...
__netif_receive_skb_one_core (net/core/dev.c:6214)
netif_receive_skb (net/core/dev.c:6474)
tun_get_user (drivers/net/tun.c:1966)
tun_chr_write_iter (drivers/net/tun.c:2012)
vfs_write (fs/read_write.c:687)
ksys_write (fs/read_write.c:739)
do_syscall_64 (arch/x86/entry/syscall_64.c:94)
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
Kernel panic - not syncing: Fatal exception in interrupt
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-2026-89780 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-89780 其他参考 (8)
同批安全公告 · Linux · 2026-09-16 · 共 20 条
| CVE-2026-89783 | Linux内核 xfrm6 越界写入漏洞 | |
| CVE-2026-89774 | Linux内核蓝牙SCO连接准备函数缺陷 | |
| CVE-2026-89775 | KVM arm64 VNCR TLB大小计算漏洞 | |
| CVE-2026-89776 | vxlan: vnifilter 属性长度校验缺陷 | |
| CVE-2026-89778 | isofs 空 zisofs 块页面数组越界访问漏洞 | |
| CVE-2026-89777 | vfio/pci初始化失败时未清空msi_perm内存泄漏 | |
| CVE-2026-89779 | NTFS3文件系统efs size验证缺陷 | |
| CVE-2026-89781 | Linux NTFS3 驱动越界读取漏洞 | |
| CVE-2026-89782 | NTFS3 fs/ntfs3 拒绝重启表增长漏洞 | |
| CVE-2026-89784 | SunRPC rpcb_register_inet4/6 返回值检查漏洞 | |
| CVE-2026-89793 | ublk 只读设备 mmap 权限清除漏洞 | |
| CVE-2026-89785 | Linux内核ntfs3驱动越界读取漏洞 | |
| CVE-2026-89787 | Ext4 文件系统 ext4_search_dir 缓冲区溢出漏洞 | |
| CVE-2026-89786 | Linux内核ext4文件系统越界读取漏洞 | |
| CVE-2026-89788 | Linux kernel ksmbd 释放后使用漏洞 | |
| CVE-2026-89790 | Linux内核ipv6模块除零漏洞 | |
| CVE-2026-89789 | Linux内核GTP驱动UAF漏洞 | |
| CVE-2026-89791 | Linux perf 工具竞态导致 UAF 漏洞 | |
| CVE-2026-89792 | Linux ksmbd 共享配置越界读取漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-89780
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