CVE-2026-31409

Summary

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: unset conn->binding on failed binding request

When a multichannel SMB2_SESSION_SETUP request with SMB2_SESSION_REQ_FLAG_BINDING fails ksmbd sets conn->binding = true but never clears it on the error path. This leaves the connection in a binding state where all subsequent ksmbd_session_lookup_all() calls fall back to the global sessions table. This fix it by clearing conn->binding = false in the error path.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf5a544e3bab78142207e0242d22442db85ba1eff < 7e8b270813079c785696bce8802a3f920665c88caffected
LinuxLinuxf5a544e3bab78142207e0242d22442db85ba1eff < d073870dab8f6dadced81d13d273ff0b21cb7f4eaffected
LinuxLinuxf5a544e3bab78142207e0242d22442db85ba1eff < 6ebef4a220a1ebe345de899ebb9ae394206fe921affected
LinuxLinuxf5a544e3bab78142207e0242d22442db85ba1eff < 89afe5e2dbea6e9d8e5f11324149d06fa3a4efcaaffected
LinuxLinuxf5a544e3bab78142207e0242d22442db85ba1eff < 9feb2d1bf86d9e5e66b8565f37f8d3a7d281a772affected
LinuxLinuxf5a544e3bab78142207e0242d22442db85ba1eff < 6260fc85ed1298a71d24a75d01f8b2e56d489a60affected
LinuxLinuxf5a544e3bab78142207e0242d22442db85ba1eff < 282343cf8a4a5a3603b1cb0e17a7083e4a593b03affected
LinuxLinux5.15affected
LinuxLinux0 < 5.15unaffected
LinuxLinux5.15.209 <= 5.15.*unaffected
LinuxLinux6.1.167 <= 6.1.*unaffected
LinuxLinux6.6.130 <= 6.6.*unaffected
LinuxLinux6.12.78 <= 6.12.*unaffected
LinuxLinux6.18.20 <= 6.18.*unaffected
LinuxLinux6.19.10 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References