CVE-2026-64380
8.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 349e13ad30b45998bb9937cfe0b32be6f951976d < 171605aed68380c2fa75dff9b3a1ed427c50065b | affected |
| Linux | Linux | 349e13ad30b45998bb9937cfe0b32be6f951976d < 4213c1208978483021d7d125c131de3985d38f61 | affected |
| Linux | Linux | 349e13ad30b45998bb9937cfe0b32be6f951976d < 96e889bc1e759c83f25093e8c2f3da31b4973f30 | affected |
| Linux | Linux | 349e13ad30b45998bb9937cfe0b32be6f951976d < 0de5b8e76847f5de26f364a82c6602c4881c30da | affected |
| Linux | Linux | 349e13ad30b45998bb9937cfe0b32be6f951976d < 427eb7eb46425fec845a43e861f3d6e2899cae59 | affected |
| Linux | Linux | 349e13ad30b45998bb9937cfe0b32be6f951976d < 86c5d470f5d42e61123b2f4b4f0b91f4eee5b980 | affected |
| Linux | Linux | 349e13ad30b45998bb9937cfe0b32be6f951976d < 46a84715a015cb48e1b9c219dc88c03d8a541ea4 | affected |
| Linux | Linux | 349e13ad30b45998bb9937cfe0b32be6f951976d < 7ad2bcf2441430bb2e918fb3ef9a90d775a6e422 | affected |
| Linux | Linux | 5.7 | affected |
| Linux | Linux | 0 < 5.7 | unaffected |
| Linux | Linux | 5.10.261 <= 5.10.* | unaffected |
| Linux | Linux | 5.15.212 <= 5.15.* | unaffected |
| Linux | Linux | 6.1.178 <= 6.1.* | unaffected |
| Linux | Linux | 6.6.145 <= 6.6.* | unaffected |
| Linux | Linux | 6.12.96 <= 6.12.* | unaffected |
| Linux | Linux | 6.18.39 <= 6.18.* | unaffected |
| Linux | Linux | 7.1.4 <= 7.1.* | unaffected |
| Linux | Linux | 7.2-rc2 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/171605aed68380c2fa75dff9b3a1ed427c50065b
- https://git.kernel.org/stable/c/4213c1208978483021d7d125c131de3985d38f61
- https://git.kernel.org/stable/c/96e889bc1e759c83f25093e8c2f3da31b4973f30
- https://git.kernel.org/stable/c/0de5b8e76847f5de26f364a82c6602c4881c30da
- https://git.kernel.org/stable/c/427eb7eb46425fec845a43e861f3d6e2899cae59
- https://git.kernel.org/stable/c/86c5d470f5d42e61123b2f4b4f0b91f4eee5b980
- https://git.kernel.org/stable/c/46a84715a015cb48e1b9c219dc88c03d8a541ea4
- https://git.kernel.org/stable/c/7ad2bcf2441430bb2e918fb3ef9a90d775a6e422
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