CVE-2026-89639
CVE CVE-2026-89639EUVD EUVD-2026-76551Published 2026-09-11T19:45:32.000ZLast changed 2026-09-13T06:32:19.000ZCVSS 7.1
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux efbcecdecefc26fa062c0e8210533ccad7d6bd4a <8b9b10fe5b8b492b27b9f4546742ea541a650213; patch: 7.3-rc1; 6.12.105 <6.13; fa724e235cfdb0fb0bb427d0f9dfe864ae27403e <364b183230586a62660a7280c1eb20138338eeb5; patch: 7.2.4; 6.18.44 <6.18.50; 7.2; 3513f3931c579ba2a715784c6dedc59e0d9282ee; patch: 0; 75640976cf474eb41682a13f2dbe9534ac26ca50; 6838bcac954487cc0a3c8a4ee1b3a3a30e244dc9; patch: 6.18.50; 7.1.8 <7.2; fa724e235cfdb0fb0bb427d0f9dfe864ae27403e <81fc3868a7f726980ff845c1d0d271051e5f0f45
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
Does this concern one of your customers?
This page cannot answer that — it does not know your estate. Whoever has recorded their environments gets the answer the morning after publication, together with a paragraph they can forward to the customer unedited.
Try it for 28 daysPatchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.