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CVE-2024-26960— 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free_swap_and_cache函数和swapoff函数之间存在竞争。

CVSS 7.0 · High EPSS 0.18% · P7

影响版本矩阵 16

厂商产品 版本范围状态
Linux Linux 7c00bafee87c7bac7ed9eced7c161f8e5332cb4e< d85c11c97ecf92d47a4b29e3faca714dc1f18d0d affected
7c00bafee87c7bac7ed9eced7c161f8e5332cb4e< 2da5568ee222ce0541bfe446a07998f92ed1643e affected
7c00bafee87c7bac7ed9eced7c161f8e5332cb4e< 1ede7f1d7eed1738d1b9333fd1e152ccb450b86a affected
7c00bafee87c7bac7ed9eced7c161f8e5332cb4e< 0f98f6d2fb5fad00f8299b84b85b6bc1b6d7d19a affected
7c00bafee87c7bac7ed9eced7c161f8e5332cb4e< 3ce4c4c653e4e478ecb15d3c88e690f12cbf6b39 affected
7c00bafee87c7bac7ed9eced7c161f8e5332cb4e< 363d17e7f7907c8e27a9e86968af0eaa2301787b affected
7c00bafee87c7bac7ed9eced7c161f8e5332cb4e< 82b1c07a0af603e3c47b906c8e991dc96f01688e affected
4.11 affected
… +8 条更多
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一、 漏洞 CVE-2024-26960 基础信息

漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
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Vulnerability Title
mm: swap: fix race between free_swap_and_cache() and swapoff()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mm: swap: fix race between free_swap_and_cache() and swapoff() There was previously a theoretical window where swapoff() could run and teardown a swap_info_struct while a call to free_swap_and_cache() was running in another thread. This could cause, amongst other bad possibilities, swap_page_trans_huge_swapped() (called by free_swap_and_cache()) to access the freed memory for swap_map. This is a theoretical problem and I haven't been able to provoke it from a test case. But there has been agreement based on code review that this is possible (see link below). Fix it by using get_swap_device()/put_swap_device(), which will stall swapoff(). There was an extra check in _swap_info_get() to confirm that the swap entry was not free. This isn't present in get_swap_device() because it doesn't make sense in general due to the race between getting the reference and swapoff. So I've added an equivalent check directly in free_swap_and_cache(). Details of how to provoke one possible issue (thanks to David Hildenbrand for deriving this): --8<----- __swap_entry_free() might be the last user and result in "count == SWAP_HAS_CACHE". swapoff->try_to_unuse() will stop as soon as soon as si->inuse_pages==0. So the question is: could someone reclaim the folio and turn si->inuse_pages==0, before we completed swap_page_trans_huge_swapped(). Imagine the following: 2 MiB folio in the swapcache. Only 2 subpages are still references by swap entries. Process 1 still references subpage 0 via swap entry. Process 2 still references subpage 1 via swap entry. Process 1 quits. Calls free_swap_and_cache(). -> count == SWAP_HAS_CACHE [then, preempted in the hypervisor etc.] Process 2 quits. Calls free_swap_and_cache(). -> count == SWAP_HAS_CACHE Process 2 goes ahead, passes swap_page_trans_huge_swapped(), and calls __try_to_reclaim_swap(). __try_to_reclaim_swap()->folio_free_swap()->delete_from_swap_cache()-> put_swap_folio()->free_swap_slot()->swapcache_free_entries()-> swap_entry_free()->swap_range_free()-> ... WRITE_ONCE(si->inuse_pages, si->inuse_pages - nr_entries); What stops swapoff to succeed after process 2 reclaimed the swap cache but before process1 finished its call to swap_page_trans_huge_swapped()? --8<-----
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/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free_swap_and_cache函数和swapoff函数之间存在竞争。
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 7c00bafee87c7bac7ed9eced7c161f8e5332cb4e ~ d85c11c97ecf92d47a4b29e3faca714dc1f18d0d -
Linux Linux 4.11 -

二、漏洞 CVE-2024-26960 的公开POC

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三、漏洞 CVE-2024-26960 的情报信息

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CVE-2024-26960 邮件列表归档 (1)

CVE-2024-26960 其他参考 (7)

同批安全公告 · Linux · 2024-05-01 · 共 159 条

CVE-2024-27388 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2024-26953 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2024-26931 8.8 HIGH Linux kernel 安全漏洞
CVE-2024-27053 8.8 HIGH Linux kernel 安全漏洞
CVE-2024-26990 8.8 HIGH Linux kernel 安全漏洞
CVE-2024-26952 8.3 HIGH Linux kernel 安全漏洞
CVE-2024-27018 8.2 HIGH Linux kernel 安全漏洞
CVE-2024-26936 8.2 HIGH Linux kernel 安全漏洞
CVE-2024-26980 8.2 HIGH Linux kernel 安全漏洞
CVE-2024-26954 8.1 HIGH Linux kernel 安全漏洞
CVE-2024-26994 7.8 HIGH Linux kernel 安全漏洞
CVE-2024-26966 7.8 HIGH Linux kernel 安全漏洞
CVE-2024-26974 7.8 HIGH Linux kernel 安全漏洞
CVE-2024-26976 7.8 HIGH Linux kernel 安全漏洞
CVE-2024-27062 7.8 HIGH Linux kernel 安全漏洞
CVE-2024-27061 7.8 HIGH Linux kernel 安全漏洞
CVE-2024-26983 7.8 HIGH Linux kernel 安全漏洞
CVE-2024-27058 7.8 HIGH Linux kernel 安全漏洞
CVE-2024-27056 7.8 HIGH Linux kernel 安全漏洞
CVE-2024-27017 7.8 HIGH Linux kernel 安全漏洞

显示前 20 条，共 159 条。 查看全部 &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-26960

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