CVE-2026-64380
smb: client: harden POSIX SID length parsing
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Jul 25, 2026 |
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Affected Versions
Linux / Linux
349e13ad30b45998bb9937cfe0b32be6f951976d < 171605aed68380c2fa75dff9b3a1ed427c50065b 349e13ad30b45998bb9937cfe0b32be6f951976d < 4213c1208978483021d7d125c131de3985d38f61 349e13ad30b45998bb9937cfe0b32be6f951976d < 96e889bc1e759c83f25093e8c2f3da31b4973f30 349e13ad30b45998bb9937cfe0b32be6f951976d < 0de5b8e76847f5de26f364a82c6602c4881c30da 349e13ad30b45998bb9937cfe0b32be6f951976d < 427eb7eb46425fec845a43e861f3d6e2899cae59 349e13ad30b45998bb9937cfe0b32be6f951976d < 86c5d470f5d42e61123b2f4b4f0b91f4eee5b980 349e13ad30b45998bb9937cfe0b32be6f951976d < 46a84715a015cb48e1b9c219dc88c03d8a541ea4 349e13ad30b45998bb9937cfe0b32be6f951976d < 7ad2bcf2441430bb2e918fb3ef9a90d775a6e422
Linux / Linux
5.7
References
git.kernel.org: https://git.kernel.org/stable/c/171605aed68380c2fa75dff9b3a1ed427c50065b git.kernel.org: https://git.kernel.org/stable/c/4213c1208978483021d7d125c131de3985d38f61 git.kernel.org: https://git.kernel.org/stable/c/96e889bc1e759c83f25093e8c2f3da31b4973f30 git.kernel.org: https://git.kernel.org/stable/c/0de5b8e76847f5de26f364a82c6602c4881c30da git.kernel.org: https://git.kernel.org/stable/c/427eb7eb46425fec845a43e861f3d6e2899cae59 git.kernel.org: https://git.kernel.org/stable/c/86c5d470f5d42e61123b2f4b4f0b91f4eee5b980 git.kernel.org: https://git.kernel.org/stable/c/46a84715a015cb48e1b9c219dc88c03d8a541ea4 git.kernel.org: https://git.kernel.org/stable/c/7ad2bcf2441430bb2e918fb3ef9a90d775a6e422