CVE-2026-97921— Tracing 组件因无效修饰符导致拒绝字段被释放漏洞
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。
以下是该漏洞描述信息的中文翻译： 在 Linux 内核中，已修复以下漏洞： 跟踪（tracing）：释放因修饰符错误而被拒绝的直方图字段 当编写一个 hist 触发器，其值或变量携带了不允许的修饰符时，会导致为其构建的字段发生内存泄漏。 函数从 获取字段，但该字段只有在修饰符检查通过后，才会被存储在 中： 上述两个检查分支都会跳转到 标签处，而该标签在返回前没有释放任何资源。此错误处理流程会回溯到 ，后者调用 进而调用 。然而， 仅通过遍历 来访问字段。那些从未被存入 的字段将无法被访问到，从而导致泄漏。 提交 （
可能的 ATT&CK 技术 1 AI
T1496 · Resource Hijacking影响版本矩阵 17
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 7403630eb94c1d664fb873f967427ef2f6ee3699< a2652fcf96b63e9da04951e4e58e6a0672df695d |
affected |
e30fbc618e97b38dbb49f1d44dcd0778d3f23b8c< 3d42fed18b2c5707b6332ebe87b789fd768eb01b |
affected | ||
e30fbc618e97b38dbb49f1d44dcd0778d3f23b8c< e787361bb6b0026ea3eb4d3fa7a304c7fcb99555 |
affected | ||
e30fbc618e97b38dbb49f1d44dcd0778d3f23b8c< b22dc0add7d72b8bd9cae3188db0dd65da1c8652 |
affected | ||
e30fbc618e97b38dbb49f1d44dcd0778d3f23b8c< 891c21f6d5673b2a519b536243bfc6dd2d35beb6 |
affected | ||
e30fbc618e97b38dbb49f1d44dcd0778d3f23b8c< 230234d12ce42ab04132a32c3a848f07a5d27a71 |
affected | ||
8d505d06d7330f5d67d3e5e9e1c647fb0b10ddad |
affected | ||
6.1.33< 6.1.189 |
affected | ||
| … +9 条更多 | |||
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一、 漏洞 CVE-2026-97921 基础信息
漏洞信息
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Vulnerability Title
tracing: Free histogram the field rejected for a bad modifier
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
tracing: Free histogram the field rejected for a bad modifier
Writing a hist trigger whose value or variable carries a modifier that is
not allowed there leaks the fields that were built for it.
__create_val_field() takes the field from parse_expr() and stores it in
hist_data->fields[] only after the modifier checks have run:
hist_field = parse_expr(hist_data, file, field_str, flags, var_name,
&n_subexprs);
...
if (hist_field->flags & HIST_FIELD_FL_VAR) {
if (hist_field->flags & (...))
goto err;
} else {
if (hist_field->flags & (...))
goto err;
}
hist_data->fields[val_idx] = hist_field;
Both checks jump past that store, and the err label returns without
freeing anything. The error unwinds to create_hist_data(), which calls
destroy_hist_data() -> destroy_hist_fields(), and that reaches a field
only by walking fields[]. A field that never got there is unreachable.
commit e0213434fe3e ("tracing: Do not let histogram values have some
modifiers") set ret to -EINVAL and fell through to the store, which left
the field owned by fields[] and freed along with the rest of hist_data.
Splitting the check into a value case and a variable case replaced that
fall-through with a goto that skips it.
With CONFIG_DEBUG_KMEMLEAK, 200 writes of
# echo 'hist:keys=prev_pid:vals=next_pid.log2' > \
events/sched/sched_switch/trigger
each correctly rejected with -EINVAL, leave 332 unreferenced objects
(63744 bytes) reported at create_hist_field(); 200 install and remove
cycles of a valid trigger leave none. A '.log2' field is two
allocations, since create_hist_field() puts the plain field in
operands[0] of the log2 field, and both are reported.
Use destroy_hist_field() rather than __destroy_hist_field() so that
operands[0] is freed as well. It returns early for HIST_FIELD_FL_VAR_REF,
which is what an operand owned by hist_data->var_refs[] needs; the
rejected field itself is never a var ref, because a var ref never carries
a modifier flag.
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-2026-97921 的公开POC
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|---|
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CVE-2026-97921 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-2026-97921
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