CVE-2026-74314— Linux kernel 安全漏洞
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。
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于BPF map更新和删除路径在值被替换或回收时调用bpf_obj_free_fields()函数，导致字段销毁依赖于操作上下文，在NMI上下文中可能执行不安全的字段销毁操作，可能导致程序异常。
可能的 ATT&CK 技术 1 AI
T1205.002 · Socket Filters影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 14a324f6a67ef6a53e04362a70160a47eb8afffa< 9ea734e2cc0143d7429ab7dc0b20c85e5836183c |
affected |
14a324f6a67ef6a53e04362a70160a47eb8afffa< a3a81d247651218e47153f2d2afd7aee236726fd |
affected | ||
f0462d38589422bc9e27fd3c6343dfeb6b3db2f9 |
affected | ||
5.18.18< 5.19 |
affected | ||
5.19 |
affected | ||
< 5.19 |
unaffected | ||
7.1.5≤ 7.1.* |
unaffected | ||
7.2≤ * |
unaffected |
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一、 漏洞 CVE-2026-74314 基础信息
漏洞信息
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Vulnerability Title
bpf: Cancel special fields on map value recycle
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
bpf: Cancel special fields on map value recycle
Map update and delete paths currently call bpf_obj_free_fields() when a
value is being replaced or recycled. That makes field destruction depend
on the context of the update/delete operation. For tracing programs this
can include NMI context, where referenced kptr destructors, uptr
unpinning, and graph root destruction are not generally safe.
Introduce bpf_obj_cancel_fields() for the reusable-value path. It only
performs NMI-safe cleanup for timer, workqueue, and task_work fields.
Fields that need full destruction are left attached to the recycled value
and are destroyed by the final cleanup path instead.
Switch array and hashtab update/delete/recycle paths to this cancel
helper. Keep bpf_obj_free_fields() for final map destruction and for
bpf_mem_alloc destructors. Preallocated hashtabs do not have allocator
destructors, so teardown continues to walk the normal and extra elements
and fully destroy their fields.
This deliberately relaxes the eager-free semantics of map update/delete
for special fields. Programs that relied on a recycled map slot becoming
empty immediately after update/delete were relying on behavior that
cannot be implemented safely from every BPF execution context without
offloading arbitrary destructors.
There is a chance this change breaks programs making assumptions
regarding the eager freeing of fields. If so, we can relax semantics to
cancellation only when irqs_disabled() is true in the future. However,
theoretically, map values that get reused eagerly already have weaker
guarantees as parallel users can recreate freed fields before the new
element becomes visible again.
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
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于BPF map更新和删除路径在值被替换或回收时调用bpf_obj_free_fields()函数，导致字段销毁依赖于操作上下文，在NMI上下文中可能执行不安全的字段销毁操作，可能导致程序异常。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-74314 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-74314 补丁与修复 (1)
同批安全公告 · Linux · 2026-08-15 · 共 844 条
| CVE-2026-74309 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72407 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72408 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74475 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72421 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74280 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74279 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72493 | 9.9 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74398 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72191 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74315 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72084 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72083 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74401 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72249 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74493 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74345 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72251 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72248 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74495 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 844 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-74314
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