smb: client: discard post-EOF pagecache when extending a file via zero range
smb3_zero_range() removed the pagecache only for the range being zeroed,
so when it extends the file the folio straddling the old EOF - which may
hold data dirtied past EOF through an mmap - was never dropped and became
visible as file content once the file was extended.
Lower the discard boundary to the smaller of the zero-range offset and the
old EOF.
Metrics
Affected Vendors & Products
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Solution
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Workaround
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Sun, 18 Oct 2026 19:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-125 |
Sun, 18 Oct 2026 16:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: smb: client: discard post-EOF pagecache when extending a file via zero range smb3_zero_range() removed the pagecache only for the range being zeroed, so when it extends the file the folio straddling the old EOF - which may hold data dirtied past EOF through an mmap - was never dropped and became visible as file content once the file was extended. Lower the discard boundary to the smaller of the zero-range offset and the old EOF. | |
| Title | smb: client: discard post-EOF pagecache when extending a file via zero range | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
Projects
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MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-10-18T15:45:55.193Z
Reserved: 2026-09-25T10:25:14.364Z
Link: CVE-2026-98686
Vulnrichment
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NVD
Status : Received
Published: 2026-10-18T16:17:21.993
Modified: 2026-10-18T16:17:21.993
Link: CVE-2026-98686
Redhat
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OpenCVE Enrichment
Updated: 2026-10-18T18:45:06Z