CVE-2026-74608

Summary

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

smb: client: Fix use-after-free in cifs_try_adding_channels()

cifs_try_adding_channels() takes a temporary reference to an interface before dropping iface_lock. If cifs_ses_add_channel() fails, it drops that reference and then increments iface->weight_fulfilled.

A concurrent interface list refresh can remove the list reference while channel creation is in progress. In that case, the failure-path kref_put() releases the last reference and frees iface. Updating weight_fulfilled afterward then accesses freed memory.

Increment weight_fulfilled before dropping the temporary reference, keeping iface alive for the final access.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxcbc53148cc0946b72d62a3c53870cb22ce4ec284 < 64d7584e62ac8cdc750455c5fdc6008fc2de4f06affected
LinuxLinuxcff97d683a083b862a8bb24309e0f4d2d928128a < c292d4686f717c03e5022fc4ae7c782f39a94915affected
LinuxLinux6aac002bcfd554aff6d3ebb55e1660d078d70ab0 < 47dfac48bce7198ad4f1a388fc8c9491f878ac3baffected
LinuxLinux6aac002bcfd554aff6d3ebb55e1660d078d70ab0 < 1ffacbadc14530e55b8d86f7b917524f6a0fb891affected
LinuxLinux6aac002bcfd554aff6d3ebb55e1660d078d70ab0 < 1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805affected
LinuxLinux6aac002bcfd554aff6d3ebb55e1660d078d70ab0 < 4986410316b1ae0e63c6ce418e4eb196723626e7affected
LinuxLinux22a6c5b3425f327e7f4c3606a72277dce82c7d83affected
LinuxLinux6.1.78 < 6.1.183affected
LinuxLinux6.6.17 < 6.6.152affected
LinuxLinux6.7.5 < 6.8affected
LinuxLinux6.8affected
LinuxLinux0 < 6.8unaffected
LinuxLinux6.1.183 <= 6.1.*unaffected
LinuxLinux6.6.152 <= 6.6.*unaffected
LinuxLinux6.12.104 <= 6.12.*unaffected
LinuxLinux6.18.45 <= 6.18.*unaffected
LinuxLinux7.1.9 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References