CVE-2026-74591— Linux 内核文件映射恢复索引前重试导致漏洞
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，已解决以下漏洞： mm/filemap: __filemap_add_folio() 在重试前恢复索引 在 __filemap_add_folio() 的分裂冲突处理循环中，xas_set_order() 被反复调用：每次调用都会修改 xas.xa_index，使其根据当前尝试的 split_order 向下取整。如果一切顺利，xas.xa_index 最终（或立即）收敛到与目标 folio_order 匹配的 xas_try_split() 所需值，此时 xas.xa_index 与 in
影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 200a89c159a7a416115e6e309183c82183bf98aa< 4917e3ebcab50f0265e8ca01c8567de4c4a47511 |
affected |
200a89c159a7a416115e6e309183c82183bf98aa< 267ecd2eb7759c26f1a026eb0a5b231071534c9c |
affected | ||
200a89c159a7a416115e6e309183c82183bf98aa< 86da3f7e1e609e1e8bfbab198af68467c5a015a5 |
affected | ||
6.15 |
affected | ||
< 6.15 |
unaffected | ||
6.18.45≤ 6.18.* |
unaffected | ||
7.1.9≤ 7.1.* |
unaffected | ||
7.2≤ * |
unaffected |
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一、 漏洞 CVE-2026-74591 基础信息
漏洞信息
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Vulnerability Title
mm/filemap: __filemap_add_folio() restore index before retrying
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
mm/filemap: __filemap_add_folio() restore index before retrying
In __filemap_add_folio()'s split-a-conflict loop, xas_set_order() is
applied repeatedly: each application modifies xas.xa_index, rounding it
down according to the split_order attempted at that stage: and if all goes
as intended, it eventually (or immediately) converges on an
xas_try_split() to the required folio_order, with xas.xa_index now the
same as index: then xas_store() puts the new folio into the xarray there.
But if a new node was needed, and GFP_NOWAIT allocation did not get one,
the lock is dropped, xas_nomem() used to allocate, and sequence retried.
If (that part of) the xarray is unchanged when the lock is reacquired, no
problem. But what if the conflict was meanwhile resolved by another
thread (perhaps even doing the same thing, inserting a folio at that same
index)? Isn't there a danger of now putting our folio into the xarray at
an intermediate rounded-down index? With !folio_contains() bug to follow,
when CONFIG_DEBUG_VM=y is checking for that.
Fix this with an xas_set_order() to restore the original xas.xa_index at
the bottom of the loop, so the retry does a full re-evaluation after
reacquiring the lock, and cannot reach xas_store() with the wrong index.
Production was suffering from rare SIGILLs and SIGSEGVs, executable text
found a page away from where it belonged, !folio_contains() bug hit when
debug enabled: symptoms not seen since this patch went in.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/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-2026-74591 的公开POC
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|---|
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CVE-2026-74591 补丁与修复 (3)
同批安全公告 · Linux · 2026-08-22 · 共 150 条
| CVE-2026-74705 | 10.0 CRITICAL | UDP隧道分段潜在使用-after-free漏洞 |
| CVE-2026-74612 | 10.0 CRITICAL | Linux内核veth模块SKB长度计算漏洞 |
| CVE-2026-74723 | 9.8 CRITICAL | btrfs LZO拒绝无有效头部的内联扩展 |
| CVE-2026-74628 | 9.8 CRITICAL | Linux内核 x25 远程计时器释放后使用漏洞 |
| CVE-2026-74669 | 9.8 CRITICAL | Linux IPVS IPv4选项后重定位隧道ICMP错误 |
| CVE-2026-74597 | 9.8 CRITICAL | Linux ip6_tunnel skb2->cb[]未清除漏洞 |
| CVE-2026-74611 | 9.8 CRITICAL | TLS 1.3 乐观重试消息迭代器恢复漏洞 |
| CVE-2026-74587 | 9.8 CRITICAL | SCTP 缓存 ASCONF 块使用后释放漏洞 |
| CVE-2026-74588 | 9.8 CRITICAL | Linux SCTP传输列表不同步漏洞 |
| CVE-2026-74727 | 9.8 CRITICAL | OpenVPN by_id移除后跳过哈希重构 |
| CVE-2026-74662 | 9.8 CRITICAL | Linux inet frags 定时器竞争条件漏洞 |
| CVE-2026-74616 | 9.8 CRITICAL | Linux内核XDP克隆数据包越界漏洞 |
| CVE-2026-74730 | 9.8 CRITICAL | NFS：在FREE_STATEID调用期间锁定struct nfs_server |
| CVE-2026-74617 | 9.8 CRITICAL | dibs: 在dibs_dev_alloc()中初始化dibs->lock |
| CVE-2026-74608 | 9.8 CRITICAL | SMB客户端cifs_try_adding_channels函数中的释放后使用漏洞 |
| CVE-2026-74586 | 9.8 CRITICAL | Linux内核SCTP对等端移除时传输未清理漏洞 |
| CVE-2026-74688 | 9.8 CRITICAL | SCTP传输控制块移除漏洞 |
| CVE-2026-74712 | 9.3 CRITICAL | mlx5 vdpa 在 create_direct_keys() 中缓冲区长度修复漏洞 |
| CVE-2026-74665 | 9.1 CRITICAL | NET skb长度计算通用XDP片段调整后修复 |
| CVE-2026-74691 | 8.8 HIGH | Thunderbolt DMA路径清理漏洞 |
显示前 20 条，共 150 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-74591
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