CVE-2026-80536— XFS内核模块脏位图越界写入漏洞
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，以下漏洞已得到解决： XFS：对缓冲区日志项的脏位图进行边界检查 会将缓冲区日志项位图所描述的每个脏区域重放至为该日志项读取的缓冲区中： 目标偏移量（来自记录的脏位图的 bit/nbits）和缓冲区大小（来自记录的 blf_len）均由攻击者控制，且二者彼此无关，而限制该拷贝操作的是 ASSERT() 断言，该断言在生产环境内核中会被编译移除。如果在一个精心构造的文件系统中，将较小的 blf_len 与超出缓冲区末尾的位图位一并记录，就会导致 写入超出缓冲区分配范围，在挂载时的日志恢复过程中
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< acb4e26295e7f0e685815a3fd3d70bd8329cefa1 |
affected |
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f3859c35a4fbc1c1c58431f684f808e43696891d |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f7b5fa83e2c192be922121b764415fa8c7549ea1 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b7528b42813f02724a78fce1da24d69d1bfc4d38 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 7e32d4eebae6ca24f8a673c107fd7eca1f47afc2 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f8288214459ead7e87d26e5822f62c14a4f2ed6b |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< edaf5b6bd625356893da20d69a259b34a9de2694 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 813f8136a2ce1fee266d02a7df73db6e8a541604 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-80536 基础信息
漏洞信息
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Vulnerability Title
xfs: bounds-check buffer log item's dirty bitmap
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
xfs: bounds-check buffer log item's dirty bitmap
xlog_recover_do_reg_buffer() replays each dirty region described by a
buffer log item's bitmap into the buffer read for that item:
memcpy(xfs_buf_offset(bp, (uint)bit << XFS_BLF_SHIFT),
item->ri_buf[i].iov_base,
nbits << XFS_BLF_SHIFT);
The destination offset (bit/nbits, from the logged dirty bitmap) and the
buffer size (from the logged blf_len) are both attacker-controlled and
otherwise unrelated, yet the only thing bounding the copy is an ASSERT(),
which compiles away on production kernels. A crafted image logging a
small blf_len together with a bitmap bit past the end of that buffer
drives the memcpy() past the buffer's allocation, corrupting adjacent
kernel heap during mount-time log recovery. This is reachable by anyone
who can get a crafted image mounted -- the malicious-filesystem threat
model XFS already guards against elsewhere.
Turn the ASSERT() into a real XFS_IS_CORRUPT() check that aborts recovery
of the buffer with -EFSCORRUPTED, consistent with the validate-and-fail
idiom already used in xlog_recover_do_inode_buffer() and
xfs_dquot_item_recover.c. xlog_recover_do_reg_buffer() therefore becomes
STATIC int and its three callers propagate the error.
Found and confirmed with KASAN on a CONFIG_XFS_DEBUG=n build: the crafted
image trips a slab-out-of-bounds write before this change and fails
recovery cleanly with -EFSCORRUPTED after it.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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-2026-80536 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-80536 补丁与修复 (2)
CVE-2026-80536 其他参考 (6)
同批安全公告 · Linux · 2026-08-26 · 共 92 条
| CVE-2026-80557 | 9.8 CRITICAL | libceph 2.0 越界读取漏洞 |
| CVE-2026-80587 | 9.8 CRITICAL | Linux内核 MPTCP 缓冲区溢出漏洞 |
| CVE-2026-74737 | 9.8 CRITICAL | TI AM65 CPSW 驱动端口ID提取错误 |
| CVE-2026-80589 | 9.8 CRITICAL | 磁盘块：释放未添加磁盘时停止超时定时器 |
| CVE-2026-74743 | 9.8 CRITICAL | macvlan 继承底层设备头部尾部空间 |
| CVE-2026-74744 | 9.8 CRITICAL | Linux内核ipvlan模块继承headroom/tailroom |
| CVE-2026-74746 | 9.8 CRITICAL | Netfilter 流表 GC 可见元组发布顺序漏洞 |
| CVE-2026-80561 | 9.8 CRITICAL | libceph 多个不安全解码远程代码执行漏洞 |
| CVE-2026-80558 | 9.8 CRITICAL | Ceph libceph 模块 OSID 索引缺陷 |
| CVE-2026-74752 | 9.8 CRITICAL | SCTP协议Cookie AUTH状态校验前使用漏洞 |
| CVE-2026-80586 | 9.8 CRITICAL | Linux内核 MPTCP 模块异常尺寸处理缺陷 |
| CVE-2026-80519 | 9.8 CRITICAL | OpenVPN 加密回调清理漏洞 |
| CVE-2026-80528 | 9.8 CRITICAL | Ceph 文件回收竞态漏洞 |
| CVE-2026-74751 | 9.4 CRITICAL | RISC-V ZBB strnlen越界读取 |
| CVE-2026-80585 | 9.4 CRITICAL | Linux 内核 MPTCP 快开子流标记错误 |
| CVE-2026-80554 | 9.3 CRITICAL | Linux s390/vfio_ccw 通道程序段数限制 |
| CVE-2026-80551 | 9.3 CRITICAL | s390/vfio_ccw: 确保首个IDAW保持不变 |
| CVE-2026-80576 | 8.8 HIGH | AMD GPU 驱动拒绝超大IB |
| CVE-2026-80553 | 8.8 HIGH | s390/vfio_ccw 队列取消机制 |
| CVE-2026-80548 | 8.8 HIGH | s390 VFIO 条件变量竞态条件 |
显示前 20 条，共 92 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-80536
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