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CVE-2026-72196: Linux

8.4

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, без 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: fs/ntfs3: bound copy_lcns dp->page_lcns[] index in analysis pass In log_replay()'s analysis pass, after find_dp() returns a valid DIR_PAGE_ENTRY for the (target_attr, target_vcn) tuple, the copy_lcns block walks lrh->lcns_follow further entries: t16 = le16_to_cpu(lrh->lcns_follow); for (i = 0; i < t16; i++) { size_t j = (size_t)(le64_to_cpu(lrh->target_vcn) - le64_to_cpu(dp->vcn)); dp->page_lcns[j + i] = lrh->page_lcns[i]; } find_dp() only validates that target_vcn falls within [dp->vcn, dp->vcn + dp->lcns_follow), i.e., that the FIRST cluster is covered. The walk through the further entries is not bounded against dp->lcns_follow. For a malformed LRH where target_vcn = dp->vcn + dp->lcns_follow - 1 and lrh->lcns_follow > 1, the i > 0 writes overflow the dp's allocated page_lcns[] array. Add the missing j + lrh->lcns_follow <= dp->lcns_follow guard. Reproduced under UML+KASAN on mainline 8d90b09e6741 as a slab-out-of-bounds write of size 8 from log_replay+0x68d4 on the mount path. This is distinct from Pavitra Jha's 2026-05-02 patch ("fs/ntfs3: validate lcns_follow in log_replay conversion", <[email protected]>) which addresses the separate version-0 dirty-page-table conversion path's memmove(&dp->vcn, ...) call. The two fixes are complementary; both should land. [[email protected]: clang-formatted the changes, fixed conflicts]

Засегнати продукти

  • Linux Linux: b46acd6a6a627d876898e1c84d3f84902264b445 преди 9b3d8cc9d54fcded4de51b2b1026ae7182512077; b46acd6a6a627d876898e1c84d3f84902264b445 преди 9b7c28d8c61bdb041936222a09a708531a1c2921; b46acd6a6a627d876898e1c84d3f84902264b445 преди 0f13e823bf86bd1800168ea0bb5bca8b8500a81c; b46acd6a6a627d876898e1c84d3f84902264b445 преди d240cd98f5f7b65c90f6b2b6abe3232ccdc405ab; b46acd6a6a627d876898e1c84d3f84902264b445 преди 49c86dae0c0ccb8d98ddcdc46987259389c816dd; b46acd6a6a627d876898e1c84d3f84902264b445 преди 5e7b598660cfa8e5af172cf4c65cffc126333307
  • Linux Linux: 5.15; преди 5.15; 6.1.178 до 6.1.*; 6.6.145 до 6.6.*; 6.12.97 до 6.12.*; 6.18.40 до 6.18.*; 7.1.5 до 7.1.*; от 7.2 нататък

История

  • 15 август 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-72196: Linux | freedomonline.bg