CVE-2025-40209— 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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于btrfs_add_qgroup_relation函数在无效qgroup级别时未释放预分配的qgroup_list结构，可能导致内存泄漏。
影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 4addc1ffd67ad34394674dc91379dc04cfdd2537< 3412d0e973e8f8381747d69033eda809a57a2581 |
affected |
4addc1ffd67ad34394674dc91379dc04cfdd2537< a4d9ebe23bcb79d9d057e3c995db73b7b3aae414 |
affected | ||
4addc1ffd67ad34394674dc91379dc04cfdd2537< f260c6aff0b8af236084012d14f9f1bf792ea883 |
affected | ||
6.11 |
affected | ||
< 6.11 |
unaffected | ||
6.12.58≤ 6.12.* |
unaffected | ||
6.17.8≤ 6.17.* |
unaffected | ||
6.18≤ * |
unaffected |
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一、 漏洞 CVE-2025-40209 基础信息
漏洞信息
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Vulnerability Title
btrfs: fix memory leak of qgroup_list in btrfs_add_qgroup_relation
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
btrfs: fix memory leak of qgroup_list in btrfs_add_qgroup_relation
When btrfs_add_qgroup_relation() is called with invalid qgroup levels
(src >= dst), the function returns -EINVAL directly without freeing the
preallocated qgroup_list structure passed by the caller. This causes a
memory leak because the caller unconditionally sets the pointer to NULL
after the call, preventing any cleanup.
The issue occurs because the level validation check happens before the
mutex is acquired and before any error handling path that would free
the prealloc pointer. On this early return, the cleanup code at the
'out' label (which includes kfree(prealloc)) is never reached.
In btrfs_ioctl_qgroup_assign(), the code pattern is:
prealloc = kzalloc(sizeof(*prealloc), GFP_KERNEL);
ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst, prealloc);
prealloc = NULL; // Always set to NULL regardless of return value
...
kfree(prealloc); // This becomes kfree(NULL), does nothing
When the level check fails, 'prealloc' is never freed by either the
callee or the caller, resulting in a 64-byte memory leak per failed
operation. This can be triggered repeatedly by an unprivileged user
with access to a writable btrfs mount, potentially exhausting kernel
memory.
Fix this by freeing prealloc before the early return, ensuring prealloc
is always freed on all error paths.
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
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于btrfs_add_qgroup_relation函数在无效qgroup级别时未释放预分配的qgroup_list结构，可能导致内存泄漏。
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-2025-40209 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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同批安全公告 · Linux · 2025-11-21 · 共 3 条
| CVE-2025-40210 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40211 | Linux kernel 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2025-40209
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