CVE-2026-89784— SunRPC rpcb_register_inet4/6 返回值检查漏洞
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: SUNRPC: check rpc_sockaddr2uaddr() return value in rpcb_register_inet4/6 rpcb_register_inet4() and rpcb_register_inet6() store the result of rpc_sockaddr2uaddr() into map->r_addr without check
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一、 漏洞 CVE-2026-89784 基础信息
漏洞信息
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Vulnerability Title
SUNRPC: check rpc_sockaddr2uaddr() return value in rpcb_register_inet4/6
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
SUNRPC: check rpc_sockaddr2uaddr() return value in rpcb_register_inet4/6
rpcb_register_inet4() and rpcb_register_inet6() store the result of
rpc_sockaddr2uaddr() into map->r_addr without checking it for NULL.
rpc_sockaddr2uaddr() returns NULL when its final kstrdup() fails, and
the unchecked NULL is then carried into the synchronous RPCBPROC_SET
encode path: rpcb_register_call() -> rpc_call_sync() ->
rpcb_enc_getaddr() -> encode_rpcb_string(), whose first statement is
strlen(string), dereferencing NULL and oopsing the kernel.
The crash reproduces under failslab on v6.12; with KASAN the NULL
dereference surfaces as a fault on the shadow of address zero:
Oops: general protection fault, probably for non-canonical address
0xdffffc0000000000 [#1] PREEMPT SMP KASAN
RIP: 0010:strlen (lib/string.c:409)
Call Trace:
encode_rpcb_string (net/sunrpc/rpcb_clnt.c:890)
rpcb_enc_getaddr (net/sunrpc/rpcb_clnt.c:910)
rpcauth_wrap_req_encode (net/sunrpc/auth.c:745)
call_encode (net/sunrpc/clnt.c:1966)
__rpc_execute (net/sunrpc/sched.c:952)
rpc_run_task (net/sunrpc/clnt.c:1243)
rpc_call_sync (net/sunrpc/clnt.c:1272)
rpcb_v4_register (net/sunrpc/rpcb_clnt.c:500)
svc_generic_rpcbind_set
nfsd_rpcbind_set
svc_register
svc_setup_socket
svc_addsock
write_ports
nfsctl_transaction_write
vfs_write
The crash is reachable when an in-kernel RPC service (nfsd, lockd,
nfs-callback) registers with the local rpcbind under enough memory
pressure for the small GFP_KERNEL kstrdup() in rpc_sockaddr2uaddr() to
fail. The asynchronous getport path already handles this exact failure
mode by returning -ENOMEM; only the two register helpers omit the check.
Mirror that handling: bail out with -ENOMEM when rpc_sockaddr2uaddr()
returns NULL, before the address is fed into the encoder.
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-2026-89784 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
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CVE-2026-89784 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-2026-89780 | Qualcomm rmnet 去聚合帧 skb->dev 恢复漏洞 | |
| CVE-2026-89782 | NTFS3 fs/ntfs3 拒绝重启表增长漏洞 | |
| 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-2026-89784
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