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

Details
INFO

Published Date :

Aug. 22, 2026, 4:16 p.m.

Last Modified :

Aug. 22, 2026, 4:16 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-74608 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Fix use-after-free by incrementing weight_fulfilled before dropping reference.
  • Increment weight_fulfilled before dropping the temporary reference.
  • Apply the kernel patch for cifs_try_adding_channels.
  • Update the Linux kernel.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-74608.

URL Resource
https://git.kernel.org/stable/c/1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805
https://git.kernel.org/stable/c/1ffacbadc14530e55b8d86f7b917524f6a0fb891
https://git.kernel.org/stable/c/47dfac48bce7198ad4f1a388fc8c9491f878ac3b
https://git.kernel.org/stable/c/4986410316b1ae0e63c6ce418e4eb196723626e7
https://git.kernel.org/stable/c/64d7584e62ac8cdc750455c5fdc6008fc2de4f06
https://git.kernel.org/stable/c/c292d4686f717c03e5022fc4ae7c782f39a94915
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-74608 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-74608 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-74608 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-74608 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 22, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'cbc53148cc0946b72d62a3c53870cb22ce4ec284', 'lessThan': '64d7584e62ac8cdc750455c5fdc6008fc2de4f06', 'versionType': 'git'}, {'status': 'affected', 'version': 'cff97d683a083b862a8bb24309e0f4d2d928128a', 'lessThan': 'c292d4686f717c03e5022fc4ae7c782f39a94915', 'versionType': 'git'}, {'status': 'affected', 'version': '6aac002bcfd554aff6d3ebb55e1660d078d70ab0', 'lessThan': '47dfac48bce7198ad4f1a388fc8c9491f878ac3b', 'versionType': 'git'}, {'status': 'affected', 'version': '6aac002bcfd554aff6d3ebb55e1660d078d70ab0', 'lessThan': '1ffacbadc14530e55b8d86f7b917524f6a0fb891', 'versionType': 'git'}, {'status': 'affected', 'version': '6aac002bcfd554aff6d3ebb55e1660d078d70ab0', 'lessThan': '1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805', 'versionType': 'git'}, {'status': 'affected', 'version': '6aac002bcfd554aff6d3ebb55e1660d078d70ab0', 'lessThan': '4986410316b1ae0e63c6ce418e4eb196723626e7', 'versionType': 'git'}, {'status': 'affected', 'version': '22a6c5b3425f327e7f4c3606a72277dce82c7d83', 'versionType': 'git'}, {'status': 'affected', 'version': '6.1.78', 'lessThan': '6.1.183', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.6.17', 'lessThan': '6.6.152', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.7.5', 'lessThan': '6.8', 'versionType': 'semver'}], 'programFiles': ['fs/smb/client/sess.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.8'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.8', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.183', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.152', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.104', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.45', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.9', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/smb/client/sess.c'], 'defaultStatus': 'affected'}]
    Added 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.
    Added Reference https://git.kernel.org/stable/c/1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805
    Added Reference https://git.kernel.org/stable/c/1ffacbadc14530e55b8d86f7b917524f6a0fb891
    Added Reference https://git.kernel.org/stable/c/47dfac48bce7198ad4f1a388fc8c9491f878ac3b
    Added Reference https://git.kernel.org/stable/c/4986410316b1ae0e63c6ce418e4eb196723626e7
    Added Reference https://git.kernel.org/stable/c/64d7584e62ac8cdc750455c5fdc6008fc2de4f06
    Added Reference https://git.kernel.org/stable/c/c292d4686f717c03e5022fc4ae7c782f39a94915
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
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