CVE-2026-64074— Linux kernel 安全漏洞

fs/statmount: fix slab out-of-bounds write in statmount_mnt_idmap

In the Linux kernel, the following vulnerability has been resolved: fs/statmount: fix slab out-of-bounds write in statmount_mnt_idmap statmount_mnt_idmap() writes one mapping with seq_printf() and then manually advances seq->count to include the NUL separator. If seq_printf() overflows, seq_set_overflow() sets seq->count to seq->size. The manual seq->count++ changes this to seq->size + 1. seq_has_overflowed() then no longer detects the overflow. The corrupted count returns to statmount_string(), which later executes: seq->buf[seq->count++] = '\0'; This causes a 1-byte NULL out-of-bounds write on the dynamically allocated seq buffer. Fix this by checking for overflow immediately after seq_printf().

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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Linux kernel 安全漏洞

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 6.15版本存在缓冲区溢出漏洞，该漏洞源于statmount_mnt_idmap函数在处理seq_printf()返回值时存在越界写入问题，可能导致缓冲区溢出。

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