CVE-2026-64380

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

VendorProductVersion RangeStatus
LinuxLinux349e13ad30b45998bb9937cfe0b32be6f951976d < 171605aed68380c2fa75dff9b3a1ed427c50065baffected
LinuxLinux349e13ad30b45998bb9937cfe0b32be6f951976d < 4213c1208978483021d7d125c131de3985d38f61affected
LinuxLinux349e13ad30b45998bb9937cfe0b32be6f951976d < 96e889bc1e759c83f25093e8c2f3da31b4973f30affected
LinuxLinux349e13ad30b45998bb9937cfe0b32be6f951976d < 0de5b8e76847f5de26f364a82c6602c4881c30daaffected
LinuxLinux349e13ad30b45998bb9937cfe0b32be6f951976d < 427eb7eb46425fec845a43e861f3d6e2899cae59affected
LinuxLinux349e13ad30b45998bb9937cfe0b32be6f951976d < 86c5d470f5d42e61123b2f4b4f0b91f4eee5b980affected
LinuxLinux349e13ad30b45998bb9937cfe0b32be6f951976d < 46a84715a015cb48e1b9c219dc88c03d8a541ea4affected
LinuxLinux349e13ad30b45998bb9937cfe0b32be6f951976d < 7ad2bcf2441430bb2e918fb3ef9a90d775a6e422affected
LinuxLinux5.7affected
LinuxLinux0 < 5.7unaffected
LinuxLinux5.10.261 <= 5.10.*unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.96 <= 6.12.*unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc2 <= *unaffected

Weaknesses

References