CVE-2026-45838— Linux kernel 安全漏洞

bpf: fix end-of-list detection in cgroup_storage_get_next_key()

In the Linux kernel, the following vulnerability has been resolved: bpf: fix end-of-list detection in cgroup_storage_get_next_key() list_next_entry() never returns NULL -- when the current element is the last entry it wraps to the list head via container_of(). The subsequent NULL check is therefore dead code and get_next_key() never returns -ENOENT for the last element, instead reading storage->key from a bogus pointer that aliases internal map fields and copying the result to userspace. Replace it with list_entry_is_head() so the function correctly returns -ENOENT when there are no more entries.

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Linux kernel 安全漏洞

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cgroup_storage_get_next_key使用list_next_entry不会返回NULL，可能导致get_next_key对最后一个元素永远不返回-ENOENT而是从别名内部映射字段的虚假指针读取storage->key并复制到用户空间。

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