CVE-2026-80536— 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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于xlog_recover_do_reg_buffer函数在恢复缓冲区日志项时对脏位图缺少边界检查，导致memcpy越界写入，可能破坏内核堆并导致权限提升或拒绝服务。
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
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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于xlog_recover_do_reg_buffer函数在恢复缓冲区日志项时对脏位图缺少边界检查，导致memcpy越界写入，可能破坏内核堆并导致权限提升或拒绝服务。
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-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 | Linux kernel 安全漏洞 |
| CVE-2026-80587 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| 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 | Linux kernel 安全漏洞 |
| CVE-2026-80576 | 8.8 HIGH | AMD GPU 驱动拒绝超大IB |
| CVE-2026-80553 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-80548 | 8.8 HIGH | Linux kernel 安全漏洞 |
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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