Answer in brief
CVE-2026-64380 records a High severity (CVSS 8.2) vulnerability in smb: client: harden POSIX SID length parsing. 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.
CVSS is 8.2. 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.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.2:rc1:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=349e13ad30b45998bb9937cfe0b32be6f951976d <171605aed68380c2fa75dff9b3a1ed427c50065b || >=349e13ad30b45998bb9937cfe0b32be6f951976d <4213c1208978483021d7d125c131de3985d38f61 || >=349e13ad30b45998bb9937cfe0b32be6f951976d <96e889bc1e759c83f25093e8c2f3da31b4973f30 || >=349e13ad30b45998bb9937cfe0b32be6f951976d <0de5b8e76847f5de26f364a82c6602c4881c30da || >=349e13ad30b45998bb9937cfe0b32be6f951976d <427eb7eb46425fec845a43e861f3d6e2899cae59 || >=349e13ad30b45998bb9937cfe0b32be6f951976d <86c5d470f5d42e61123b2f4b4f0b91f4eee5b980 || >=349e13ad30b45998bb9937cfe0b32be6f951976d <46a84715a015cb48e1b9c219dc88c03d8a541ea4 || >=349e13ad30b45998bb9937cfe0b32be6f951976d <7ad2bcf2441430bb2e918fb3ef9a90d775a6e422 | 171605aed68380c2fa75dff9b3a1ed427c50065b, 4213c1208978483021d7d125c131de3985d38f61, 96e889bc1e759c83f25093e8c2f3da31b4973f30, 0de5b8e76847f5de26f364a82c6602c4881c30da, 427eb7eb46425fec845a43e861f3d6e2899cae59, 86c5d470f5d42e61123b2f4b4f0b91f4eee5b980, 46a84715a015cb48e1b9c219dc88c03d8a541ea4, 7ad2bcf2441430bb2e918fb3ef9a90d775a6e422 |
| Linux/Linuxgeneric | 5.7 | Not reported |
Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: smb: client: harden POSIX SID length parsing posix_info_sid_size() reads sid[1] to obtain the subauthority count, but its existing boundary check still accepts buffers with only one remaining byte. Require two bytes before reading sid[1] so all client paths that reuse the helper reject truncated POSIX SIDs safely.
Quoted source text, attributed separately from HOL analysis.