In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix use-after-free in cifs_try_adding_channels()… (CVE-2026-74608)
A use-after-free vulnerability in the Linux kernel's SMB client implementation was resolved. The flaw occurs in the cifs_try_adding_channels() function where a reference to an interface can be freed prematurely during concurrent operations, leading to memory access after free. The fix involves reordering reference counting to ensure the interface remains valid during updates.
AI Analysis
Technical Summary
CVE-2026-74608 addresses a use-after-free vulnerability in the Linux kernel SMB client code, specifically in the cifs_try_adding_channels() function. The function temporarily references an interface before releasing a lock. If adding a channel fails, it drops the reference and increments iface->weight_fulfilled. However, a concurrent refresh of the interface list can remove the last reference, freeing the interface. Subsequent incrementing of weight_fulfilled then accesses freed memory. The patch changes the order of operations to increment weight_fulfilled before dropping the temporary reference, preventing use-after-free.
Potential Impact
This vulnerability could lead to use-after-free memory access in the Linux kernel SMB client, potentially causing system instability or crashes. No information about exploitation in the wild or privilege escalation is provided.
Mitigation Recommendations
A fix for this vulnerability has been applied in the Linux kernel. Users should update to the latest kernel versions containing this patch. Since no vendor advisory or patch links are provided, check official Linux kernel release notes for the specific fix.
In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix use-after-free in cifs_try_adding_channels()… (CVE-2026-74608)
Description
A use-after-free vulnerability in the Linux kernel's SMB client implementation was resolved. The flaw occurs in the cifs_try_adding_channels() function where a reference to an interface can be freed prematurely during concurrent operations, leading to memory access after free. The fix involves reordering reference counting to ensure the interface remains valid during updates.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-74608 addresses a use-after-free vulnerability in the Linux kernel SMB client code, specifically in the cifs_try_adding_channels() function. The function temporarily references an interface before releasing a lock. If adding a channel fails, it drops the reference and increments iface->weight_fulfilled. However, a concurrent refresh of the interface list can remove the last reference, freeing the interface. Subsequent incrementing of weight_fulfilled then accesses freed memory. The patch changes the order of operations to increment weight_fulfilled before dropping the temporary reference, preventing use-after-free.
Potential Impact
This vulnerability could lead to use-after-free memory access in the Linux kernel SMB client, potentially causing system instability or crashes. No information about exploitation in the wild or privilege escalation is provided.
Mitigation Recommendations
A fix for this vulnerability has been applied in the Linux kernel. Users should update to the latest kernel versions containing this patch. Since no vendor advisory or patch links are provided, check official Linux kernel release notes for the specific fix.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-q727-xf93-53j5
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-74608"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a8a27f3acd9273b499bc872
Added to database: 08/22/2026, 22:51:31 UTC
Last enriched: 08/22/2026, 23:26:23 UTC
Last updated: 08/22/2026, 23:52:11 UTC
Views: 2
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