CVSS 3.1
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.
- Експлоатация: няма данни за експлоатация
- Атаката не може да се автоматизира
Описание
Оригинално описание
In the Linux kernel, the following vulnerability has been resolved: mm: filemap: fix nr_pages calculation overflow in filemap_map_pages() When running stress-ng on my Arm64 machine with v7.0-rc3 kernel, I encountered some very strange crash issues showing up as "Bad page state": " [ 734.496287] BUG: Bad page state in process stress-ng-env pfn:415735fb [ 734.496427] page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x4cf316 pfn:0x415735fb [ 734.496434] flags: 0x57fffe000000800(owner_2|node=1|zone=2|lastcpupid=0x3ffff) [ 734.496439] raw: 057fffe000000800 0000000000000000 dead000000000122 0000000000000000 [ 734.496440] raw: 00000000004cf316 0000000000000000 0000000000000000 0000000000000000 [ 734.496442] page dumped because: nonzero mapcount " After analyzing this page’s state, it is hard to understand why the mapcount is not 0 while the refcount is 0, since this page is not where the issue first occurred. By enabling the CONFIG_DEBUG_VM config, I can reproduce the crash as well and captured the first warning where the issue appears: " [ 734.469226] page: refcount:33 mapcount:0 mapping:00000000bef2d187 index:0x81a0 pfn:0x415735c0 [ 734.469304] head: order:5 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 734.469315] memcg:ffff000807a8ec00 [ 734.469320] aops:ext4_da_aops ino:100b6f dentry name(?):"stress-ng-mmaptorture-9397-0-2736200540" [ 734.469335] flags: 0x57fffe400000069(locked|uptodate|lru|head|node=1|zone=2|lastcpupid=0x3ffff) ...... [ 734.469364] page dumped because: VM_WARN_ON_FOLIO((_Generic((page + nr_pages - 1), const struct page *: (const struct folio *)_compound_head(page + nr_pages - 1), struct page *: (struct folio *)_compound_head(page + nr_pages - 1))) != folio) [ 734.469390] ------------[ cut here ]------------ [ 734.469393] WARNING: ./include/linux/rmap.h:351 at folio_add_file_rmap_ptes+0x3b8/0x468, CPU#90: stress-ng-mlock/9430 [ 734.469551] folio_add_file_rmap_ptes+0x3b8/0x468 (P) [ 734.469555] set_pte_r
Засегнати продукти
- Linux Linux: fe601b70eac6cd266e8d7d55030e90a73ed0e339 преди 88591194df736a508dd5461ab2167a61e98caac1; 743a2753a02e805347969f6f89f38b736850d808 преди 633ab680c405ac390e6bec5b74aaf46197c837b6; 743a2753a02e805347969f6f89f38b736850d808 преди 576543bedd616254032d4ebe54a90076f9e31740; 743a2753a02e805347969f6f89f38b736850d808 преди 9316a820b9aae07d44469d6485376dad824c5b3f; 743a2753a02e805347969f6f89f38b736850d808 преди f58df566524ebcdfa394329c64f47e3c9257516e; 84ede15f27c06b111d1398dfa80b6fac4b135e34; 6.6.117 преди 6.6.135; 6.1.159 преди 6.2
- Linux Linux: 6.12; преди 6.12; 6.6.135 до 6.6.*; 6.12.82 до 6.12.*; 6.18.23 до 6.18.*; 6.19.13 до 6.19.*; от 7.0 нататък
Вид слабост
История
- 24 април 2026 Публикувано
Други уязвимости в Linux Linux
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-31648
- https://nvd.nist.gov/vuln/detail/CVE-2026-31648
- https://git.kernel.org/stable/c/88591194df736a508dd5461ab2167a61e98caac1
- https://git.kernel.org/stable/c/633ab680c405ac390e6bec5b74aaf46197c837b6
- https://git.kernel.org/stable/c/576543bedd616254032d4ebe54a90076f9e31740
- https://git.kernel.org/stable/c/9316a820b9aae07d44469d6485376dad824c5b3f
- https://git.kernel.org/stable/c/f58df566524ebcdfa394329c64f47e3c9257516e