CVE-2026-89757— 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mm/mglru的sort_folio()对不可驱逐folio处理不当，未正确设置mlock_count且LRU标志操作顺序错误，可能导致计数错误和意外行为。
可能的 ATT&CK 技术 1 AI
T1565 · Data Manipulation影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | ac35a490237446b71e3b4b782b1596967edd0aa8< 54a58d6656dd403b686b247f0bad8507cbfb45df |
affected |
ac35a490237446b71e3b4b782b1596967edd0aa8< 15d3a2a71c8bf7333d019d249ee33669e69e4275 |
affected | ||
ac35a490237446b71e3b4b782b1596967edd0aa8< f7e698e326b239a91ea15844817551921209e826 |
affected | ||
6.1 |
affected | ||
< 6.1 |
unaffected | ||
6.18.51≤ 6.18.* |
unaffected | ||
7.2.4≤ 7.2.* |
unaffected | ||
7.3-rc1≤ * |
unaffected |
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一、 漏洞 CVE-2026-89757 基础信息
漏洞信息
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Vulnerability Title
mm/mglru: fix and remove redundant unevictable folio handling
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
mm/mglru: fix and remove redundant unevictable folio handling
sort_folio() has a shortcut for moving folios that are no longer evictable
but are still sitting on a generation list. However, this shortcut is
buggy. It does not follow the PG_lru usage convention, and it has a more
serious issue.
Unevictable folios are not threaded on lists[LRU_UNEVICTABLE], so that
folio->lru can be reused to hold folio->mlock_count (see the comment in
lruvec_init()). Hence lruvec_add_folio() skips the list_add() for them,
and every other place that turns a folio unevictable initialises
mlock_count explicitly: lru_add() sets it to 0, __mlock_folio() and
__mlock_new_folio() set it to !!folio_test_mlocked(folio). sort_folio()
sets nothing, and the lru_gen_del_folio() right above it may have already
poisoned folio->lru via list_del(), so mlock_count ends up aliasing
LIST_POISON2, which reads as 0x122, i.e. 290. The result is user
visible. On munlock, __munlock_folio() decrements that bogus count, finds
it still non-zero and bails out before clearing PG_mlocked, so the folio
remains unevictable and the Mlocked accounting stays inflated until the
folio is freed.
The shortcut also touches the LRU flags in the wrong order. It calls
lru_gen_del_folio() while PG_lru is still set, so a concurrent
folio_test_clear_lru() (e.g. compaction, folio_isolate_lru()) can succeed
on a folio that has already been taken off the generation list, which may
lead to unexpected behavior.
So fix it by isolating them as common folios and letting the generic
shrink path cull them. This matches the classical LRU behavior, and there
should be no visible effect on the generic eviction or isolation behavior.
There is no performance concern either, such a folio goes through this
once, and then it is off the generation lists for good.
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
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mm/mglru的sort_folio()对不可驱逐folio处理不当，未正确设置mlock_count且LRU标志操作顺序错误，可能导致计数错误和意外行为。
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-2026-89757 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-89757 补丁与修复 (3)
同批安全公告 · Linux · 2026-09-11 · 共 431 条
| CVE-2026-89669 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89536 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89533 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-81002 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89643 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89526 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89652 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89651 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89653 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89654 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89656 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89655 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89712 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89658 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89660 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89659 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89708 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89662 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89689 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89686 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 431 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-89757
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