CVE-2026-97922— tracing 直方图变量引用释放漏洞
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。
在 Linux 内核中，已修复以下漏洞： tracing：无论直方图变量引用被使用多少次，均释放其引用 在同一个 histogram（直方图）触发器中三次或多次使用同一变量时，会在触发器被移除时导致变量引用及其相关字符串发生泄漏。 commit 656fe2ba85e8（“tracing：使用 hist 触发器的 var_ref 数组来销毁 var_refs”）使得触发器的 数组成为变量引用的唯一拥有者：由于 对于 类型会提前返回，因此字段表达式永远不会销毁这些引用。在这种情况下，每个条目仅释放一次，无需引用计数。
可能的 ATT&CK 技术 1 AI
T1564.004 · NTFS File Attributes影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 8bcebc77e85f3d7536f96845a0fe94b1dddb6af0< a1f1d64a0a9791c842c4646253daf6ac0313eac7 |
affected |
8bcebc77e85f3d7536f96845a0fe94b1dddb6af0< b513a4c60a7aa1f4b4c2a48544ab003cb36f1e94 |
affected | ||
8bcebc77e85f3d7536f96845a0fe94b1dddb6af0< e7b6d67b43caee9183a4374d23641578ea556e6c |
affected | ||
8bcebc77e85f3d7536f96845a0fe94b1dddb6af0< 4cff53bb19412c6f2d90b50678de5c3903f7f96a |
affected | ||
8bcebc77e85f3d7536f96845a0fe94b1dddb6af0< 94bbd65da4ae26592fa1977a74ee94218ab02a26 |
affected | ||
8bcebc77e85f3d7536f96845a0fe94b1dddb6af0< 4bddcb346a6cf4615ca77f69a589623b877ca267 |
affected | ||
ce28d664054df01997baace61d1defca77689798 |
affected | ||
bf470f051556b610265ea02ad2102de75e8e619c |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-97922 基础信息
漏洞信息
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Vulnerability Title
tracing: Free histogram var refs regardless of how often they are referenced
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
tracing: Free histogram var refs regardless of how often they are referenced
Using the same variable three or more times in one hist trigger leaks the
variable reference and its strings when the trigger is removed.
commit 656fe2ba85e8 ("tracing: Use hist trigger's var_ref array to destroy
var_refs") made a trigger's var_refs[] array the only owner of a var ref:
destroy_hist_field() returns early for HIST_FIELD_FL_VAR_REF, so the field
expressions never destroy one. One entry, freed once, no count needed.
commit 8bcebc77e85f ("tracing: Fix histogram code when expression has same
var as value") then made repeated references share one object and added a
count of them. Only the increment side exists, since those expressions
still return early and never drop a reference, so __destroy_hist_field()
sees how many references were created rather than how many are left. It
frees when the decremented count is 0 or 1, so two references work and
three or more leak.
Sharing kept one array entry per object, and create_var_ref() searches and
appends within a single trigger, so nothing outside it holds the object.
Removing a trigger whose variables are still referenced is already refused
by check_var_refs() with -EBUSY. Drop the count and free unconditionally.
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-2026-97922 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-97922 补丁与修复 (6)
同批安全公告 · Linux · 2026-09-25 · 共 372 条
| CVE-2026-100075 | 9.8 CRITICAL | RDMA/srpt：srpt_alloc_rw_ctxs() 未释放计数器修复 |
| CVE-2026-97555 | 8.8 HIGH | smb客户端：修复DACL所有者/组重写中的堆溢出漏洞 |
| CVE-2026-97957 | 8.8 HIGH | hinic 邮箱段缓冲区溢出漏洞 |
| CVE-2026-97527 | 8.8 HIGH | qla2xxx SCSI驱动程序 NVMe未解决上下文列表竞争条件漏洞 |
| CVE-2026-97528 | 8.8 HIGH | QLogic qla2xxx驱动LS拒绝错误NVMe内存泄漏漏洞 |
| CVE-2026-98115 | 8.8 HIGH | ksmbd 注销期间会话安全排空漏洞 |
| CVE-2026-97525 | 8.2 HIGH | x86/mm/pat：内核页表分裂页表分配漏洞 |
| CVE-2026-98069 | 8.1 HIGH | Net/RDS rds_conn_shutdown() 快速路径锁获取漏洞 |
| CVE-2026-97573 | 8.1 HIGH | bnxt_en 驱动 bnxt_rx_ring_reset 缓冲区分配失败漏洞 |
| CVE-2026-97570 | 8.1 HIGH | bnxt_en: 修复因SW TPA ID绑定问题导致的崩溃漏洞 |
| CVE-2026-98130 | 8.1 HIGH | SCTP定时器启动竞争条件漏洞 |
| CVE-2026-98070 | 8.1 HIGH | Linux RDS 模块远程代码执行漏洞 |
| CVE-2026-98122 | 7.8 HIGH | Linux内核vxlan mdb远程源删除后使用漏洞 |
| CVE-2026-97575 | 7.8 HIGH | v4l2-ctrls AV1瓦片计数验证漏洞 |
| CVE-2026-97576 | 7.8 HIGH | V4L2-ctrls HEVC 瓦片计数验证漏洞 |
| CVE-2026-98112 | 7.8 HIGH | ksmbd 网络接口事件中监听器任务生命周期修复漏洞 |
| CVE-2026-98002 | 7.8 HIGH | AMD IOMMU 嵌套域分配中错误检查失效漏洞 |
| CVE-2026-98116 | 7.8 HIGH | ALSA: PCM内存映射与缓冲区重新分配序列化以修复页面UAF漏洞 |
| CVE-2026-97580 | 7.8 HIGH | rkvdec HEVC解析数组越界漏洞 |
| CVE-2026-97940 | 7.8 HIGH | IPv6 修复 fib6 遍历器在 seq 停止时存在 UAF 漏洞 |
显示前 20 条，共 372 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-97922
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