Answer in brief
CVE-2026-68388 records a Unknown severity vulnerability in smb/client: handle overlapping allocated ranges in fallocate. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=966a3cb7c7db786452a87afdc3b48858fc4d4d6b <437637f5ff3f573b2edf8571de91fb00a21eb4e6 || >=966a3cb7c7db786452a87afdc3b48858fc4d4d6b <377fe3e583e46369ee1004d5cfe12271d6589a68 || >=966a3cb7c7db786452a87afdc3b48858fc4d4d6b <7e08ab7a061b17ac1989a225c6afb53f44a86808 || >=966a3cb7c7db786452a87afdc3b48858fc4d4d6b <a4a09e5142835633fffbde68bd0a039ba4d4bf97 || >=966a3cb7c7db786452a87afdc3b48858fc4d4d6b <b09ae45d85dc816987a71db9eebc54b0ae288e94 || c406bb9ece6ef63721daab106f132ff4b4234e81 || 2f9f4a2d0e6fcf0673ed51195e06e47abe966900 || 5e397c943424de94879830e72c95f2679e297a76 || >=5.10.50 <5.11 || >=5.12.17 <5.13 || >=5.13.2 <5.14 | 437637f5ff3f573b2edf8571de91fb00a21eb4e6, 377fe3e583e46369ee1004d5cfe12271d6589a68, 7e08ab7a061b17ac1989a225c6afb53f44a86808, a4a09e5142835633fffbde68bd0a039ba4d4bf97, b09ae45d85dc816987a71db9eebc54b0ae288e94, 5.11, 5.13, 5.14 |
| Linux/Linuxgeneric | 5.14 | Not reported |
Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 10, 2026
In the Linux kernel, the following vulnerability has been resolved: smb/client: handle overlapping allocated ranges in fallocate smb3_simple_fallocate_range() can skip holes when an allocated range returned by the server starts before the current fallocate offset. The skipped hole is not zero-filled, but fallocate still returns success. A later write to that hole may therefore fail with ENOSPC. The function queries allocated ranges so that it can preserve existing contents and write zeroes only into holes. However, the server may return a range that starts before the current fallocate offset. For example, assume the fallocate request is [100, 400) and the only allocated range returned by the server is [0, 200): Request: [100, 400) Server range: [ 0, 200) allocated Correct: [100, 200) allocated data, skip [200, 400) hole, zero-fill Current: [100, 300) skipped [300, 400) zero-filled afterwards The current code adds the full server range length, 200, to the current offset 100 and moves to 300. As a result, the hole in [200, 300) is skipped without being zero-filled. Fix this by advancing only over the part of the allocated range that overlaps the current fallocate offset. Ignore ranges that end before the current offset and reject ranges whose end offset overflows. This also prevents a malformed range length from causing an out-of-bounds zero-buffer read.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-68388 records a Unknown severity vulnerability in smb/client: handle overlapping allocated ranges in fallocate. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=966a3cb7c7db786452a87afdc3b48858fc4d4d6b <437637f5ff3f573b2edf8571de91fb00a21eb4e6 || >=966a3cb7c7db786452a87afdc3b48858fc4d4d6b <377fe3e583e46369ee1004d5cfe12271d6589a68 || >=966a3cb7c7db786452a87afdc3b48858fc4d4d6b <7e08ab7a061b17ac1989a225c6afb53f44a86808 || >=966a3cb7c7db786452a87afdc3b48858fc4d4d6b <a4a09e5142835633fffbde68bd0a039ba4d4bf97 || >=966a3cb7c7db786452a87afdc3b48858fc4d4d6b <b09ae45d85dc816987a71db9eebc54b0ae288e94 || c406bb9ece6ef63721daab106f132ff4b4234e81 || 2f9f4a2d0e6fcf0673ed51195e06e47abe966900 || 5e397c943424de94879830e72c95f2679e297a76 || >=5.10.50 <5.11 || >=5.12.17 <5.13 || >=5.13.2 <5.14 | 437637f5ff3f573b2edf8571de91fb00a21eb4e6, 377fe3e583e46369ee1004d5cfe12271d6589a68, 7e08ab7a061b17ac1989a225c6afb53f44a86808, a4a09e5142835633fffbde68bd0a039ba4d4bf97, b09ae45d85dc816987a71db9eebc54b0ae288e94, 5.11, 5.13, 5.14 |
| Linux/Linuxgeneric | 5.14 | Not reported |
Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 10, 2026
In the Linux kernel, the following vulnerability has been resolved: smb/client: handle overlapping allocated ranges in fallocate smb3_simple_fallocate_range() can skip holes when an allocated range returned by the server starts before the current fallocate offset. The skipped hole is not zero-filled, but fallocate still returns success. A later write to that hole may therefore fail with ENOSPC. The function queries allocated ranges so that it can preserve existing contents and write zeroes only into holes. However, the server may return a range that starts before the current fallocate offset. For example, assume the fallocate request is [100, 400) and the only allocated range returned by the server is [0, 200): Request: [100, 400) Server range: [ 0, 200) allocated Correct: [100, 200) allocated data, skip [200, 400) hole, zero-fill Current: [100, 300) skipped [300, 400) zero-filled afterwards The current code adds the full server range length, 200, to the current offset 100 and moves to 300. As a result, the hole in [200, 300) is skipped without being zero-filled. Fix this by advancing only over the part of the allocated range that overlaps the current fallocate offset. Ignore ranges that end before the current offset and reject ranges whose end offset overflows. This also prevents a malformed range length from causing an out-of-bounds zero-buffer read.
Quoted source text, attributed separately from HOL analysis.