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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2026-74608

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

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • cbc53148cc0946b72d62a3c53870cb22ce4ec284 to < 64d7584e62ac8cdc750455c5fdc6008fc2de4f06affected
  • cff97d683a083b862a8bb24309e0f4d2d928128a to < c292d4686f717c03e5022fc4ae7c782f39a94915affected
  • 6aac002bcfd554aff6d3ebb55e1660d078d70ab0 to < 47dfac48bce7198ad4f1a388fc8c9491f878ac3baffected
  • 6aac002bcfd554aff6d3ebb55e1660d078d70ab0 to < 1ffacbadc14530e55b8d86f7b917524f6a0fb891affected
  • 6aac002bcfd554aff6d3ebb55e1660d078d70ab0 to < 1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805affected
  • 6aac002bcfd554aff6d3ebb55e1660d078d70ab0 to < 4986410316b1ae0e63c6ce418e4eb196723626e7affected
  • 22a6c5b3425f327e7f4c3606a72277dce82c7d83affected
  • 6.1.78 to < 6.1.183affected
  • 6.6.17 to < 6.6.152affected
  • 6.7.5 to < 6.8affected

Linux Linux

Default version status: affected

  • 6.8affected
  • 0 to < 6.8unaffected
  • 6.1.183 to ≤ 6.1.*unaffected
  • 6.6.152 to ≤ 6.6.*unaffected
  • 6.12.104 to ≤ 6.12.*unaffected
  • 6.18.45 to ≤ 6.18.*unaffected
  • 7.1.9 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References