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CVE-2026-45942— 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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ext4文件系统中页面迁移与位图修改之间的竞争条件，可能导致e4b位图不一致报告。

CVSS 7.8 · High EPSS 0.10% · P1

可能的 ATT&CK 技术 1 AI

T1496 · Resource Hijacking

影响版本矩阵 12

厂商产品 版本范围状态
Linux Linux c9de560ded61faa5b754137b7753da252391c55a< 57e83bfbe1e412ac42daced2086f3c6f9a17bba0 affected
c9de560ded61faa5b754137b7753da252391c55a< c05033cfc5c7699cd4df8d48cef94d01da755f24 affected
c9de560ded61faa5b754137b7753da252391c55a< 29a07d691d282faf38c33d4b61839b89399110f9 affected
c9de560ded61faa5b754137b7753da252391c55a< f29709a7a3fc38f5015d850504762cdef0e151f9 affected
c9de560ded61faa5b754137b7753da252391c55a< bdc56a9c46b2a99c12313122b9352b619a2e719e affected
2.6.25 affected
< 2.6.25 unaffected
6.6.130≤ 6.6.* unaffected
… +4 条更多
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一、 漏洞 CVE-2026-45942 基础信息

漏洞信息
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Vulnerability Title
ext4: fix e4b bitmap inconsistency reports
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix e4b bitmap inconsistency reports A bitmap inconsistency issue was observed during stress tests under mixed huge-page workloads. Ext4 reported multiple e4b bitmap check failures like: ext4_mb_complex_scan_group:2508: group 350, 8179 free clusters as per group info. But got 8192 blocks Analysis and experimentation confirmed that the issue is caused by a race condition between page migration and bitmap modification. Although this timing window is extremely narrow, it is still hit in practice: folio_lock ext4_mb_load_buddy __migrate_folio check ref count folio_mc_copy __filemap_get_folio folio_try_get(folio) ...... mb_mark_used ext4_mb_unload_buddy __folio_migrate_mapping folio_ref_freeze folio_unlock The root cause of this issue is that the fast path of load_buddy only increments the folio's reference count, which is insufficient to prevent concurrent folio migration. We observed that the folio migration process acquires the folio lock. Therefore, we can determine whether to take the fast path in load_buddy by checking the lock status. If the folio is locked, we opt for the slow path (which acquires the lock) to close this concurrency window. Additionally, this change addresses the following issues: When the DOUBLE_CHECK macro is enabled to inspect bitmap-related issues, the following error may be triggered: corruption in group 324 at byte 784(6272): f in copy != ff on disk/prealloc Analysis reveals that this is a false positive. There is a specific race window where the bitmap and the group descriptor become momentarily inconsistent, leading to this error report: ext4_mb_load_buddy ext4_mb_load_buddy __filemap_get_folio(create|lock) folio_lock ext4_mb_init_cache folio_mark_uptodate __filemap_get_folio(no lock) ...... mb_mark_used mb_mark_used_double mb_cmp_bitmaps mb_set_bits(e4b->bd_bitmap) folio_unlock The original logic assumed that since mb_cmp_bitmaps is called when the bitmap is newly loaded from disk, the folio lock would be sufficient to prevent concurrent access. However, this overlooks a specific race condition: if another process attempts to load buddy and finds the folio is already in an uptodate state, it will immediately begin using it without holding folio lock.
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
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ext4文件系统中页面迁移与位图修改之间的竞争条件，可能导致e4b位图不一致报告。
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

厂商 产品 影响版本 CPE 订阅
Linux Linux c9de560ded61faa5b754137b7753da252391c55a ~ 57e83bfbe1e412ac42daced2086f3c6f9a17bba0 -
Linux Linux 2.6.25 -

二、漏洞 CVE-2026-45942 的公开POC

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三、漏洞 CVE-2026-45942 的情报信息

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CVE-2026-45942 补丁与修复 (4)

同批安全公告 · Linux · 2026-05-27 · 共 275 条

CVE-2026-45898 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-46039 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-45988 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-45972 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-46043 9.1 CRITICAL Linux kernel 安全漏洞
CVE-2026-45945 8.8 HIGH Linux kernel 安全漏洞
CVE-2026-46056 8.8 HIGH Linux kernel 安全漏洞
CVE-2026-45843 8.2 HIGH Linux kernel 安全漏洞
CVE-2026-46037 8.2 HIGH Linux kernel 安全漏洞
CVE-2025-71311 8.2 HIGH Linux kernel 安全漏洞
CVE-2026-46010 8.1 HIGH Linux kernel 安全漏洞
CVE-2026-46099 8.1 HIGH Linux kernel 安全漏洞
CVE-2026-46076 7.9 HIGH Linux kernel 安全漏洞
CVE-2026-45931 7.8 HIGH Linux kernel 安全漏洞
CVE-2026-45951 7.8 HIGH Linux kernel 安全漏洞
CVE-2026-45935 7.8 HIGH Linux kernel 安全漏洞
CVE-2026-45933 7.8 HIGH Linux kernel 安全漏洞
CVE-2026-45984 7.8 HIGH Linux kernel 安全漏洞
CVE-2026-45862 7.8 HIGH Linux kernel 安全漏洞
CVE-2026-45861 7.8 HIGH Linux kernel 安全漏洞

显示前 20 条，共 275 条。 查看全部 &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-45942

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