cifs: call pagecache_isize_extended() in cifs_setsize() when extending
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
- —
- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 5 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: cifs: call pagecache_isize_extended() in cifs_setsize() when extending cifs_setsize() calls truncate_pagecache() but skips pagecache_isize_extended() on extension. truncate_setsize() shows the correct pattern: i_size_write(inode, newsize); if (newsize > oldsize) pagecache_isize_extended(inode, oldsize, newsize); truncate_pagecache(inode, newsize); pagecache_isize_extended() zeroes the tail of the page straddling old EOF. Without it, dirty bytes in that region can be written back to the server, exposing stale data in the newly extended range.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 6.1.191, 6.6.160, 6.12.114, 6.18.57, 7.2.4, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Not affected: 2 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-89642
- 2026-10-03 Alias added: GHSA-cjwf-376p-qpm9
- 2026-10-16 Fix available: Linux/[email protected], Linux/Linux@e1f692b6da3e632a25d0b3a99f833bb609bae1a3 · CNA
- 2026-10-16 1 new reference · CNA
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-21 Affected versions changed · Red Hat
- 2026-10-21 CVSS score changed · Red Hat
- 2026-10-21 Fix available: Linux/Linux@40c16040783abcc240bd1b453e679ea6ca30e19e, Linux/Linux@5463d96cd2e46064ceefcf861b028745a4f4c373, Linux/[email protected] +1 · CNA
- 2026-10-21 2 new references · CNA
- 2026-10-30 Fix available: Linux/[email protected], Linux/Linux@880e1b5883a5d78d916fa446791c48f28a16719b · CNA
- 2026-10-30 1 new reference · CNA
- 2026-11-06 Affected versions changed · Red Hat
References
Other 6
- https://git.kernel.org/stable/c/880e1b5883a5d78d916fa446791c48f28a16719b
- https://git.kernel.org/stable/c/5463d96cd2e46064ceefcf861b028745a4f4c373
- https://git.kernel.org/stable/c/40c16040783abcc240bd1b453e679ea6ca30e19e
- https://git.kernel.org/stable/c/e1f692b6da3e632a25d0b3a99f833bb609bae1a3
- https://git.kernel.org/stable/c/12bafe32f09c0d24f5096154b59c347b9c6606e0
- https://git.kernel.org/stable/c/c510edb9734af1c274d18f4f31a471a166bbc7e8
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Sources
- CVE-2026-89642 · CVE Program
- CVE-2026-89642 · NVD
- FIRST EPSS
- GHSA-cjwf-376p-qpm9 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-89642 · Red Hat security data · CC BY 4.0
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