cifs: use cifs_invalidate_cache() in cifs_do_truncate() for O_TRUNC
Summary
| CVE | CVE-2026-89639 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-11 20:19:49 UTC |
| Updated | 2026-10-19 09:18:01 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS: 0.001240000 probability, percentile 0.024820000 (date 2026-09-14)
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 7.1 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| 3.1 | CNA | DECLARED | 7.1 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
NoneCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected efbcecdecefc26fa062c0e8210533ccad7d6bd4a 8b9b10fe5b8b492b27b9f4546742ea541a650213 git | Not specified |
| CNA | Linux | Linux | affected fa724e235cfdb0fb0bb427d0f9dfe864ae27403e 81fc3868a7f726980ff845c1d0d271051e5f0f45 git | Not specified |
| CNA | Linux | Linux | affected fa724e235cfdb0fb0bb427d0f9dfe864ae27403e 364b183230586a62660a7280c1eb20138338eeb5 git | Not specified |
| CNA | Linux | Linux | affected 6838bcac954487cc0a3c8a4ee1b3a3a30e244dc9 git | Not specified |
| CNA | Linux | Linux | affected 75640976cf474eb41682a13f2dbe9534ac26ca50 git | Not specified |
| CNA | Linux | Linux | affected 3513f3931c579ba2a715784c6dedc59e0d9282ee git | Not specified |
| CNA | Linux | Linux | affected 6.18.44 6.18.50 semver | Not specified |
| CNA | Linux | Linux | affected 6.12.105 6.13 semver | Not specified |
| CNA | Linux | Linux | affected 7.1.8 7.2 semver | Not specified |
| CNA | Linux | Linux | affected 7.2 | Not specified |
| CNA | Linux | Linux | unaffected 7.2 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.50 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2.4 7.2.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.3 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/81fc3868a7f726980ff845c1d0d271051e5f0f45 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/364b183230586a62660a7280c1eb20138338eeb5 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/8b9b10fe5b8b492b27b9f4546742ea541a650213 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.