CVE-2026-90261— Btrfs文件系统分区块元数据刷写漏洞
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，以下漏洞已得到修复： btrfs: zoned: 在 btree_writepages() 开始时刷新活动的元数据块组 按逻辑地址升序写入 btree 数据节点的脏元数据。在 zoned（分区）文件系统中，同一时间只有一个元数据块组和一个系统块组处于活动写入状态。 （通过 ）会随着写回过程从一个块组切换到下一个块组而切换活动的块组。 如果活动块组位于另一个包含脏元数据的块组的更高逻辑地址处，那么按升序遍历时会先到达较低的块组。为了写入该较低的块组，必须先完成当前活动块组并激活较低的块组。然而
影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 13bb483d32abb6f8ebd40141d87eb68f11cc2dd2< e2de2989adb3e58c2320e57c255f52e065667b5e |
affected |
13bb483d32abb6f8ebd40141d87eb68f11cc2dd2< ecc05eda9a346848ae01a6c8bfa3f0bec133bd8b |
affected | ||
fca3a1cd3ba47f1815e0c0fcdc9aafaf02ee0a75 |
affected | ||
6.5.5< 6.6 |
affected | ||
6.6 |
affected | ||
< 6.6 |
unaffected | ||
7.2.6≤ 7.2.* |
unaffected | ||
7.3-rc1≤ * |
unaffected |
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一、 漏洞 CVE-2026-90261 基础信息
漏洞信息
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Vulnerability Title
btrfs: zoned: flush active metadata block group at btree_writepages() start
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
btrfs: zoned: flush active metadata block group at btree_writepages() start
btree_writepages() writes the btree inode's dirty metadata in ascending
logical address order. On a zoned filesystem only one metadata and one
system block group is active for writing at a time, and
check_bg_is_active() (via btrfs_check_meta_write_pointer()) pivots the
active block group as writeback moves from one block group to the next.
If the active block group sits at a higher logical address than another
block group that also holds dirty metadata, the ascending walk reaches
the lower one first and, to write it, has to finish the active block
group and activate the lower one. It cannot finish a block group that
still has unsent IO, and during WB_SYNC_ALL && !for_sync (commit)
writeback it deliberately refuses to wait for that IO under
fs_info->zoned_meta_io_lock, as that can deadlock. The pivot thus cannot
issue the submission itself either, so it gives up:
btrfs_check_meta_write_pointer() returns -EAGAIN, which
btrfs_write_and_wait_transaction() treats as fatal and aborts the
transaction, forcing the filesystem read-only. This happens
intermittently under metadata-heavy relocation (e.g. fstests btrfs/187).
Flush the active metadata and system block groups at the start of
btree_writepages(), under the fs_info->zoned_meta_io_lock it already
holds, so they have no unsent IO left and the later pivot can finish
them and make forward progress.
来源: CVE Program / CVE List V5
CVSS Information
N/A
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-2026-90261 的公开POC
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|---|
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CVE-2026-90261 补丁与修复 (1)
同批安全公告 · Linux · 2026-09-17 · 共 600 条
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| CVE-2026-90357 | 8.8 HIGH | mt76驱动MT7915无线局域网远程拒绝服务漏洞 |
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| CVE-2026-90381 | 8.8 HIGH | Linux内核mt76驱动无线信道切换漏洞 |
| CVE-2026-90380 | 8.8 HIGH | MT76驱动 mt792x 使用释放后内存漏洞 |
| CVE-2026-90329 | 8.8 HIGH | Linux 内核 HID 驱动探测清理同步漏洞 |
| CVE-2026-93042 | 8.8 HIGH | Linux内核dmaengine模块资源耗尽漏洞 |
| CVE-2026-90162 | 8.8 HIGH | Linux ksmbd 锁授予UAF/双重释放竞态漏洞 |
| CVE-2026-90379 | 8.8 HIGH | Linux 内核 mt76 驱动系统崩溃漏洞 |
| CVE-2026-90367 | 8.8 HIGH | Linux内核MT7996驱动死锁漏洞 |
| CVE-2026-90371 | 8.8 HIGH | mt76 无线驱动 RXDMAD_C 竞态修复 |
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IV. Related Vulnerabilities
V. Comments for CVE-2026-90261
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