CVE-2026-80537— Linux Kernel 2.31 XFS 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。
以下是该 Linux 内核漏洞描述信息的中文翻译： --- Linux 内核中，以下漏洞已得到修复： xfs：修复 rtrefcount btree 根层级校验中的差一（off-by-one）错误 函数设置了如下内容： 其中，末尾的 已经计入了 inode-根层级。因此，磁盘上有效的最深层级为 ，而游标（cursor）必须满足 （即 ）。 两个磁盘校验路径 和 在检查根层级时使用了 而非 。因此，一个精心构造的包含 rtreflink（metadir + 实时分区 + reflink）的文件系统镜像，若其 inod
可能的 ATT&CK 技术 3 AI
T1190 · Exploit Public-Facing Application T1562 T1201 · Password Policy Discovery影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 9abe03a0e4f978615a2b1b484b8d09ca84c16ea0< 8a0ecae2ecda9f9a83a496ed05c42c4b1f5c3f2d |
affected |
9abe03a0e4f978615a2b1b484b8d09ca84c16ea0< ccebfc309441e0b37b2e6ece90f18810a489d326 |
affected | ||
9abe03a0e4f978615a2b1b484b8d09ca84c16ea0< cc3144da377de5fb422d44a2311f978623f7c900 |
affected | ||
6.14 |
affected | ||
< 6.14 |
unaffected | ||
6.18.46≤ 6.18.* |
unaffected | ||
7.1.10≤ 7.1.* |
unaffected | ||
7.2≤ * |
unaffected |
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一、 漏洞 CVE-2026-80537 基础信息
漏洞信息
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Vulnerability Title
xfs: fix off-by-one in rtrefcount btree root level validation
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
xfs: fix off-by-one in rtrefcount btree root level validation
xfs_rtrefcountbt_compute_maxlevels() sets
mp->m_rtrefc_maxlevels = min(d_maxlevels, r_maxlevels) + 1;
where the trailing "+ 1" already accounts for the inode-root level, so the
deepest valid on-disk root level is m_rtrefc_maxlevels - 1 and a cursor must
satisfy bc_nlevels <= bc_maxlevels (= m_rtrefc_maxlevels).
The two on-disk validation paths, xfs_rtrefcountbt_verify() and
xfs_iformat_rtrefcount(), check the root level with ">" instead of ">=", so a
crafted rtreflink (metadir + realtime + reflink) image whose
/rtgroups/N.refcount inode has bb_level == m_rtrefc_maxlevels is accepted on
mount. xfs_rtrefcountbt_init_cursor() then sets bc_nlevels = bb_level + 1,
exceeding bc_maxlevels by one. Since the xfs_rtrefcountbt_cur slab object is
sized for exactly bc_maxlevels entries, the first btree op on such a cursor
indexes bc_levels[m_rtrefc_maxlevels] past the end of the object. This is
reached by the first rtrefcount cursor built after mount, via log/CoW
recovery (xfs_reflink_recover_cow() during xfs_mountfs()) or an
FS_IOC_GETFSMAP over the realtime device.
Reject a root level equal to m_rtrefc_maxlevels, matching the ">=" form
already used by the sibling data-device refcount/rmap verifiers and the
in-memory rtrmap verifier.
BUG: KASAN: slab-out-of-bounds in xfs_btree_lookup (fs/xfs/libxfs/xfs_btree.c:2101)
Write of size 2 at addr ffff888018391658 by task exploit/144
xfs_btree_lookup (fs/xfs/libxfs/xfs_btree.c:2101)
xfs_btree_query_range (fs/xfs/libxfs/xfs_btree.c:5308)
xfs_refcount_recover_cow_leftovers (fs/xfs/libxfs/xfs_refcount.c:2113)
xfs_reflink_recover_cow (fs/xfs/xfs_reflink.c:1085)
xlog_recover_finish (fs/xfs/xfs_log_recover.c:3551)
xfs_mountfs (fs/xfs/xfs_mount.c:1158)
xfs_fs_fill_super (fs/xfs/xfs_super.c:1940)
get_tree_bdev_flags (fs/super.c:1634)
vfs_get_tree (fs/super.c:1694)
path_mount (fs/namespace.c:4161)
__x64_sys_mount (fs/namespace.c:4367)
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
The buggy address belongs to the cache xfs_rtrefcountbt_cur of size 216
The buggy address is located 8 bytes to the right of
allocated 216-byte region [ffff888018391578, ffff888018391650)
Kernel panic - not syncing: Fatal exception
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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-2026-80537 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-80537 补丁与修复 (3)
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-2026-74737 | 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-2026-80587 | 9.8 CRITICAL | Linux内核 MPTCP 缓冲区溢出漏洞 |
| 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-2026-80585 | 9.4 CRITICAL | Linux 内核 MPTCP 快开子流标记错误 |
| CVE-2026-74751 | 9.4 CRITICAL | RISC-V ZBB strnlen越界读取 |
| 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-2026-80553 | 8.8 HIGH | s390/vfio_ccw 队列取消机制 |
| CVE-2026-80576 | 8.8 HIGH | AMD GPU 驱动拒绝超大IB |
| 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-2026-80537
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