Critical 9.8Published Aug 22, 2026

CVE-2026-74608smb: client: Fix use-after-free in cifs_try_adding_channels()

Updated under an hour ago (Oct 27, 2026, 5:20 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from cbc53148cc0946b72d62a3c53870cb22ce4ec284 before 64d7584e62ac8cdc750455c5fdc6008fc2de4f06; from cff97d683a083b862a8bb24309e0f4d2d928128a before c292d4686f717c03e5022fc4ae7c782f39a94915; from 6aac002bcfd554aff6d3ebb55e1660d078d70ab0 before 47dfac48bce7198ad4f1a388fc8c9491f878ac3b; 6aac002bcfd554aff6d3ebb55e1660d078d70ab0 builds before 1ffacbadc14530e55b8d86f7b917524f6a0fb891; from 6aac002bcfd554aff6d3ebb55e1660d078d70ab0 before 1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805; from 6aac002bcfd554aff6d3ebb55e1660d078d70ab0 before 4986410316b1ae0e63c6ce418e4eb196723626e7; 22a6c5b3425f327e7f4c3606a72277dce82c7d83; from 6.1.78 before 6.1.183; and 2 more ranges	CNA record

References

References

https://git.kernel.org/stable/c/64d7584e62ac8cdc750455c5fdc6008fc2de4f06
https://git.kernel.org/stable/c/c292d4686f717c03e5022fc4ae7c782f39a94915
https://git.kernel.org/stable/c/47dfac48bce7198ad4f1a388fc8c9491f878ac3b
https://git.kernel.org/stable/c/1ffacbadc14530e55b8d86f7b917524f6a0fb891
https://git.kernel.org/stable/c/1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805
https://git.kernel.org/stable/c/4986410316b1ae0e63c6ce418e4eb196723626e7

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.