CVE-2026-97420— bpf：sysctl值替换后未NUL终止漏洞
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。
以下是该漏洞描述信息的中文翻译： 在 Linux 内核中，以下漏洞已得到解决： bpf：NUL 终止符替换后的 sysctl 值 在写入 sysctl 时， 保证传递给 proc 处理程序的缓冲区是 NUL（空字符）终止的。如果 替换了待处理的 sysctl 值，它可以直接将替换后的缓冲区传递给 proc 处理程序。然而，当前的辅助函数仅将 字节复制到该缓冲区中，而未追加 NUL 终止符，导致下游解析器存在越界访问的风险。 通过在被替换的值后追加一个 来修复此问题，以恢复预期的 sysctl 语义。由于辅助函数已经
可能的 ATT&CK 技术 1 AI
T1564.004 · NTFS File Attributes影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 32927393dc1ccd60fb2bdc05b9e8e88753761469< bfcee1f79aaefa90679ad47690107fb7682724ec |
affected |
32927393dc1ccd60fb2bdc05b9e8e88753761469< c73e4a04eedc677fe91a736d7a5db45100adba5e |
affected | ||
32927393dc1ccd60fb2bdc05b9e8e88753761469< 36d3e9f62dc2beb9299d3bb6f589cb9e07f773fe |
affected | ||
32927393dc1ccd60fb2bdc05b9e8e88753761469< 31377675c3d75603d957c08e338a9ac27e9f6cd5 |
affected | ||
32927393dc1ccd60fb2bdc05b9e8e88753761469< 76c14b10f50eb0afcc76e244562fa2d8c661e224 |
affected | ||
32927393dc1ccd60fb2bdc05b9e8e88753761469< 3b2814dd842a565fcf9cc370156e1ba9eae16239 |
affected | ||
32927393dc1ccd60fb2bdc05b9e8e88753761469< a66e3b5bacf38d6ab29fa05a9754f7a114485605 |
affected | ||
5.8 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2026-97420 基础信息
漏洞信息
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Vulnerability Title
bpf: NUL-terminate replaced sysctl value
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
bpf: NUL-terminate replaced sysctl value
When writing to sysctls, proc_sys_call_handler() guarantees that the
buffer passed to proc handlers is NUL-terminated. If
bpf_sysctl_set_new_value() replaces the pending sysctl value, it can
hand a replacement buffer directly to proc handlers. However, the
helper currently copies only buf_len bytes into that buffer without
appending a NUL terminator, leaving downstream parsers vulnerable to
out-of-bounds access.
Fix this by appending a '\0' after the replaced value to restore the
expected sysctl semantics. Since the helper already rejects buf_len
greater than PAGE_SIZE - 1, there is always room for the extra byte.
Reproduced in a QEMU x86_64 guest booted with KASAN while exercising
the sysctl replacement path with a cgroup/sysctl BPF program. The
reproducer targets `/proc/sys/net/core/flow_limit_cpu_bitmap`, fills
the original user write buffer with non-zero bytes, and overrides the
sysctl value so the replacement buffer lacks a terminating NUL. Under
that setup, the pre-fix kernel reported:
BUG: KASAN: slab-out-of-bounds in strnchrnul+0x72/0x90
Read of size 1 at addr ffff88800de57000 by task repro_patch3/66
CPU: 0 UID: 0 PID: 66 Comm: repro_patch3 Not tainted 7.1.0-rc3-00269-g8370ca1f87cc #6 PREEMPT(lazy)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0x68/0xa0
print_report+0xcb/0x5e0
? __virt_addr_valid+0x21d/0x3f0
? strnchrnul+0x72/0x90
? strnchrnul+0x72/0x90
kasan_report+0xca/0x100
? strnchrnul+0x72/0x90
strnchrnul+0x72/0x90
bitmap_parse+0x37/0x2e0
flow_limit_cpu_sysctl+0xc6/0x840
? __pfx_flow_limit_cpu_sysctl+0x10/0x10
? __kvmalloc_node_noprof+0x5ba/0x870
proc_sys_call_handler+0x31d/0x480
? __pfx_proc_sys_call_handler+0x10/0x10
? selinux_file_permission+0x39f/0x500
? lock_is_held_type+0x9e/0x120
vfs_write+0x98e/0x1000
...
</TASK>
The buggy address is located 0 bytes to the right of
allocated 4096-byte region [ffff88800de56000, ffff88800de57000)
With this fix applied, rerunning the same sysctl-targeted path yields
no corresponding KASAN reports.
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-2026-97420 的公开POC
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|---|
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CVE-2026-97420 补丁与修复 (7)
同批安全公告 · Linux · 2026-09-24 · 共 234 条
| CVE-2026-93207 | 9.8 CRITICAL | SUNRPC svcauth_gss_decode_credbody() 存在安全漏洞 |
| CVE-2026-97413 | 9.8 CRITICAL | Linux RDMA/rtrs-srv整数下溢漏洞 |
| CVE-2026-93228 | 9.1 CRITICAL | svcrdma 拒绝段计数为0的写入/回复块漏洞 |
| CVE-2026-93799 | 8.8 HIGH | iwlwifi mvm BA窗口状态通知中sta_id验证漏洞 |
| CVE-2026-97442 | 8.8 HIGH | ath11k无线驱动rx_h_undecap_nwifi无效数据访问漏洞 |
| CVE-2026-97409 | 8.8 HIGH | Linux NVMe-oF目标未初始化前取消请求漏洞 |
| CVE-2026-93806 | 8.8 HIGH | wifi: cfg80211 关联响应长度验证漏洞 |
| CVE-2026-93793 | 8.8 HIGH | iwlwifi 驱动 TX_CMD 响应布局验证漏洞 |
| CVE-2026-93790 | 8.8 HIGH | iwlwifi 驱动 BA 通知中 tid_data 越界访问漏洞 |
| CVE-2026-93284 | 8.8 HIGH | drm/pagemap 迁移错误前未解除 dma 映射 |
| CVE-2026-93280 | 8.8 HIGH | Greybus 音频拓扑边界检查漏洞 |
| CVE-2026-97509 | 8.8 HIGH | Thunderbolt 服务期间保持 XDomain 引用漏洞 |
| CVE-2026-93827 | 8.4 HIGH | virtio-fs 队列设置失败时双重释放漏洞 |
| CVE-2026-97450 | 8.4 HIGH | ACPICA 双重验证处理器对象类型漏洞 |
| CVE-2026-97452 | 8.4 HIGH | ACPICA：防止添加无效引用 |
| CVE-2026-97451 | 8.4 HIGH | ACPICA mid_op 整数溢出漏洞 |
| CVE-2026-97455 | 8.4 HIGH | ACPICA acpi_ds_terminate_control_method 使用后释放漏洞 |
| CVE-2026-97433 | 8.2 HIGH | NVMe 验证 FDP 配置描述符大小 |
| CVE-2026-93787 | 8.1 HIGH | CIFS cifs_filldir 中目录项名称越界访问漏洞 |
| CVE-2026-93786 | 8.1 HIGH | ksmbd 保持 VFS 继承 POSIX ACL 掩码漏洞 |
显示前 20 条，共 234 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-97420
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