CVE-2026-89665— Linux内核 NFSv2 参数越界拒绝服务
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 内核中，以下漏洞已修复： nfsd：拒绝 NFSv2 SETATTR/CREATE 中超出范围的 useconds 值 NFSv2 的 sattr 解码器在 中将线上的 useconds 转换为纳秒： 其中 是 ， 为 1000，因此乘积在 unsigned long 中计算。在 ILP32 架构下，unsigned long 为 32 位，当 useconds 取值超出范围（例如 4294968）时，结果会回绕（wrap），导致 。这种数据损坏发生在解码阶段，早于任何处理函数检查该值的机会；随后对 的
可能的 ATT&CK 技术 1 AI
T1015影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< a937dd1aa2d92291fe0a1860d17e90d8f206cd22 |
affected |
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< ad02d095439f89cbd6629420c7e3ba476457b83b |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 1195483965a5f63d2dde18054ec7e50a23b9071c |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 26709c8ffe73772eb69e68d553ac71d91228dccc |
affected | ||
2.6.12 |
affected | ||
< 2.6.12 |
unaffected | ||
6.12.109≤ 6.12.* |
unaffected | ||
6.18.50≤ 6.18.* |
unaffected | ||
| … +2 条更多 | |||
获取后续新漏洞提醒
登录后订阅
一、 漏洞 CVE-2026-89665 基础信息
漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
查看神龙十问 ↗
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
nfsd: reject out-of-range useconds in NFSv2 SETATTR/CREATE
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
nfsd: reject out-of-range useconds in NFSv2 SETATTR/CREATE
The NFSv2 sattr decoder converts the wire useconds to nanoseconds in
svcxdr_decode_sattr():
iap->ia_atime.tv_nsec = tmp2 * NSEC_PER_USEC;
tmp2 is a u32 and NSEC_PER_USEC is 1000, so the product is computed in
unsigned long. On ILP32 that is 32 bits, and an out-of-range useconds
value such as 4294968 wraps to tv_nsec == 704. The corruption therefore
happens during decode, before any proc function can inspect the value,
and a later range check on tv_nsec would see an in-range result and
accept it. Rejecting in the decoder yields an RPC GARBAGE_ARGS reply.
NFSv2 defines no NFSERR_INVAL, so there is no NFS-level status to return
for a malformed time argument, and the check cannot move to the proc
function the way the v3/v4 nsec range checks do.
Guard the raw useconds before the multiplication and reject values
greater than 1000000. useconds == 1000000 is kept: it is the Sun
convention for "set to the current server time", and the in-tree Linux
NFSv2 client emits it in both the atime and the mtime field for a plain
touch / utimes(file, NULL) (see encode_sattr() and
xdr_encode_current_server_time() in fs/nfs/nfs2xdr.c). Rejecting 1000000
would turn that common operation into a hard decode failure for both
SETATTR and CREATE. 1000000 * NSEC_PER_USEC is 10^9, which does not wrap
on ILP32, so the Sun convention value passes through safely. Only
genuinely out-of-range values (> 1000000) are rejected. The atime and
mtime guards are therefore symmetric.
The decoder only applied the Sun convention in the mtime block, which
clears ATTR_ATIME_SET|ATTR_MTIME_SET when mtime useconds == 1000000. If a
client puts 1000000 in the atime field but not in the mtime field, the
atime block stored an out-of-range tv_nsec (10^9) and left ATTR_ATIME_SET
set, so the bogus value reached the filesystem. Apply the convention in
the atime block as well, clearing ATTR_ATIME_SET so the server uses its
current time and ignores the value. Only ATTR_ATIME_SET is cleared there.
The mtime block keeps its existing behavior, where 1000000 means "set
both atime and mtime to now".
[ cel: various tweaks, addenda, and clean-ups ]
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-2026-89665 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
高级
未找到公开 POC。
登录以生成 AI POC三、漏洞 CVE-2026-89665 的情报信息
请登录查看更多情报信息。
CVE-2026-89665 其他参考 (4)
同批安全公告 · Linux · 2026-09-11 · 共 431 条
| CVE-2026-89491 | OCFS2集群心跳锁持有期间睡眠漏洞 | |
| CVE-2026-89477 | Linux内核 SCTP 重配置空指针引用漏洞 | |
| CVE-2026-89478 | sctp：移除的传输中丢弃数据块 | |
| CVE-2026-89479 | 内核SCTP模块关联删除后仍处理报文 | |
| CVE-2026-89480 | NVMe-TCP 读取字节数异常拒绝漏洞 | |
| CVE-2026-89482 | NVMe-TCP 数据长度误判漏洞 | |
| CVE-2026-89481 | NVMe/TCP 主机内存泄露漏洞 | |
| CVE-2026-89483 | Linux内核 NVMe驱动 逻辑错误 | |
| CVE-2026-89484 | Linux内核lockd 空指针解引用漏洞 | |
| CVE-2026-89485 | Linux lockd 锁释放时文件指针固定漏洞 | |
| CVE-2026-89486 | IPMI 驱动 _ipmi_destroy_user 释放后使用漏洞 | |
| CVE-2026-89487 | Open vSwitch 数据包丢弃逻辑缺陷 | |
| CVE-2026-89488 | Open vSwitch CT limit 释放后使用漏洞 | |
| CVE-2026-89489 | OpenRISC 内核 or1k_atomic 任意内存访问漏洞 | |
| CVE-2026-89500 | ring-buffer 缓冲区读取页修复 | |
| CVE-2026-89497 | Orangefs 调试掩码解析空格处理缺陷 | |
| CVE-2026-89498 | Orangefs 双重释放漏洞 | |
| CVE-2026-89499 | ring-buffer 页面交换失败时停止远程读取 | |
| CVE-2026-89496 | ocfs2文件系统COW完成处理缺陷 | |
| CVE-2026-89501 | ring-buffer 子缓冲区调整时未持锁漏洞 |
显示前 20 条，共 431 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-89665
暂无评论