CVE-2026-89639: Linux

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: cifs: use cifs_invalidate_cache() in cifs_do_truncate() for O_TRUNC cifs_do_truncate() is invoked from cifs_open() without i_rwsem, so it cannot use cifs_resize_file_locked() to perform a proper fscache cookie resize. Instead, add cifs_invalidate_cache() after cifs_setsize(). cifs_invalidate_cache() calls fscache_invalidate(), which works without holding i_rwsem: it unconditionally increments inval_counter and sets FSCACHE_COOKIE_NO_DATA_TO_READ, ensuring that stale cached data is not served once the cookie is later activated by fscache_use_cookie(). Truncation to zero leaves no valid cached data, making invalidation the correct semantic here.

Засегнати продукти

• Linux Linux: efbcecdecefc26fa062c0e8210533ccad7d6bd4a преди 8b9b10fe5b8b492b27b9f4546742ea541a650213; fa724e235cfdb0fb0bb427d0f9dfe864ae27403e преди 81fc3868a7f726980ff845c1d0d271051e5f0f45; fa724e235cfdb0fb0bb427d0f9dfe864ae27403e преди 364b183230586a62660a7280c1eb20138338eeb5; 6838bcac954487cc0a3c8a4ee1b3a3a30e244dc9; 75640976cf474eb41682a13f2dbe9534ac26ca50; 3513f3931c579ba2a715784c6dedc59e0d9282ee; 6.18.44 преди 6.18.50; 6.12.105 преди 6.13; 7.1.8 преди 7.2
• Linux Linux: 7.2; преди 7.2; 6.18.50 до 6.18.*; 7.2.4 до 7.2.*; 7.3 до *

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99268
• CVE-2026-99266
• CVE-2026-99267

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-89639
• https://nvd.nist.gov/vuln/detail/CVE-2026-89639
• https://git.kernel.org/stable/c/8b9b10fe5b8b492b27b9f4546742ea541a650213
• https://git.kernel.org/stable/c/81fc3868a7f726980ff845c1d0d271051e5f0f45
• https://git.kernel.org/stable/c/364b183230586a62660a7280c1eb20138338eeb5