CVE-2026-99018— RISC-V 内核影子调用栈加载逻辑缺陷
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。
在 Linux 内核中，以下漏洞已得到修复： riscv: entry: 根据 sstatus.SPP 而非 tp 寄存器来重新加载门控影子调用栈 在启用 配置时， 函数仅当异常（trap）来自用户空间时，才会重新加载内核影子调用栈指针（即 gp 寄存器）。该函数原本通过 来判断是否来自用户空间：它将捕获时刻的 tp 值（从 sscratch 寄存器读回 s5）与当前的 tp 值进行比较： 然而，tp 是一个用户可写的寄存器。如果用户空间任务在触发异常前，将 tp 设置为自身 的线性映射地址（即 ），则上述比较将成
影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | d1584d791a297aa8ed93503382a682a6ecfc4218< 6639735367a7d491977e9e5e7afc50b489d81d83 |
affected |
d1584d791a297aa8ed93503382a682a6ecfc4218< 7d1367a53137e379498eb8791295e58854378636 |
affected | ||
d1584d791a297aa8ed93503382a682a6ecfc4218< 37b4401ee6fa06046446d55e97e8d11784080843 |
affected | ||
d1584d791a297aa8ed93503382a682a6ecfc4218< 4d0697f192975dab5985e921989be1d85cf580e9 |
affected | ||
6.7 |
affected | ||
< 6.7 |
unaffected | ||
6.12.113≤ 6.12.* |
unaffected | ||
6.18.57≤ 6.18.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2026-99018 基础信息
漏洞信息
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Vulnerability Title
riscv: entry: gate shadow call stack reload on sstatus.SPP, not tp
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
riscv: entry: gate shadow call stack reload on sstatus.SPP, not tp
Under CONFIG_SHADOW_CALL_STACK, handle_exception() reloads the kernel
shadow call stack pointer (gp) only when the trap came from userspace.
It made that decision with scs_load_current_if_task_changed, which
compares the trap-time tp (read back from sscratch into s5) against the
current tp:
beq \prev, tp, _skip_scs
scs_load_current
_skip_scs:
tp is a user-writable register. A user task that sets tp to the
linear-map address of its own task_struct (¤t) before trapping
makes the comparison succeed (can achieve by brute force with KASLR
enable under our test), so the kernel skips scs_load_current and
keeps running with the gp that userspace left in place. Under
CONFIG_SHADOW_CALL_STACK gp is the shadow call stack pointer and
load_global_pointer is a no-op, so the compiler-emitted
"sd ra, -8(gp)" / "ld ra, -8(gp)" in every non-leaf function then write
to, and return through, an attacker-controlled address -- an
unprivileged kernel arbitrary-write and control-flow-hijack primitive.
The poisoned gp is saved to task_struct.scs_sp on return, so the reload
is skipped on every subsequent entry as well.
Decide "came from userspace" from the hardware sstatus.SPP bit (already
in s1 at this point) instead of from tp, mirroring the check that
ret_from_exception already uses a few instructions later. SPP is
written by hardware on trap entry and cannot be forged from U-mode.
Legitimate behaviour is unchanged: user entries (SPP=0) reload the task
shadow call stack, nested kernel entries (SPP=1) skip it.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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-2026-99018 的公开POC
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CVE-2026-99018 补丁与修复 (4)
同批安全公告 · Linux · 2026-10-23 · 共 217 条
| CVE-2026-98959 | 9.8 CRITICAL | btrfs 扩展属性替换处理远程代码执行漏洞 |
| CVE-2026-99078 | 9.8 CRITICAL | Mellanox mlx5e MPWQE重试时XSK缓冲区释放漏洞 |
| CVE-2026-99079 | 9.8 CRITICAL | Mellanox mlx5e 驱动 XSK 缓冲区释放漏洞 |
| CVE-2026-98988 | 8.8 HIGH | Linux 5.13 命名空间越界漏洞 |
| CVE-2026-99083 | 8.8 HIGH | ksmbd 的 krb5_authenticate() 函数堆越界写漏洞 |
| CVE-2026-99082 | 8.8 HIGH | KVM x86 内存管理漏洞 |
| CVE-2026-98870 | 8.8 HIGH | ksmbd 会话清理时存在通道移除逻辑漏洞 |
| CVE-2026-98980 | 8.8 HIGH | namei 遍历中过度挂载条目信息泄露漏洞 |
| CVE-2026-98981 | 8.8 HIGH | Linux 内核命名空间 dentry 解挂载前未哈希漏洞 |
| CVE-2026-99042 | 8.4 HIGH | io_uring 24 字节 sockaddr_in6 过滤字段填充漏洞 |
| CVE-2026-98978 | 8.4 HIGH | Linux 命名空间 锁定挂载永不失效漏洞 |
| CVE-2026-99064 | 8.1 HIGH | CIPSO 缓存选项偏移调整漏洞 |
| CVE-2026-98968 | 8.1 HIGH | AMT 中继通用查询远程代码执行漏洞 |
| CVE-2026-99016 | 7.8 HIGH | RISC-V futex 用户指针未去标签原子访问漏洞 |
| CVE-2026-99012 | 7.8 HIGH | Linux 蓝牙 ISO 并发连接序列化漏洞 |
| CVE-2026-99002 | 7.8 HIGH | vmwgfx 驱动用户空间 pitch 参数验证漏洞 |
| CVE-2026-98899 | 7.8 HIGH | Linux netfilter ipset 竞态条件漏洞 |
| CVE-2026-99006 | 7.8 HIGH | i915 GEM 执行数组越界漏洞 |
| CVE-2026-98999 | 7.8 HIGH | Intel Xe DRM 驱动程序链接表项失效漏洞 |
| CVE-2026-99032 | 7.8 HIGH | Linux 内核 SMC 模块 信息泄露漏洞 |
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