CVE-2026-89639cifs: use cifs_invalidate_cache() in cifs_do_truncate() for O_TRUNC
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 13, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from efbcecdecefc26fa062c0e8210533ccad7d6bd4a before 8b9b10fe5b8b492b27b9f4546742ea541a650213; from fa724e235cfdb0fb0bb427d0f9dfe864ae27403e before 81fc3868a7f726980ff845c1d0d271051e5f0f45; from fa724e235cfdb0fb0bb427d0f9dfe864ae27403e before 364b183230586a62660a7280c1eb20138338eeb5; 6838bcac954487cc0a3c8a4ee1b3a3a30e244dc9; 75640976cf474eb41682a13f2dbe9534ac26ca50; 3513f3931c579ba2a715784c6dedc59e0d9282ee; from 6.18.44 before 6.18.50; from 6.12.105 before 6.13; and 1 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/8b9b10fe5b8b492b27b9f4546742ea541a650213
- https://git.kernel.org/stable/c/81fc3868a7f726980ff845c1d0d271051e5f0f45
- https://git.kernel.org/stable/c/364b183230586a62660a7280c1eb20138338eeb5
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.