In the Linux kernel, the following vulnerability has been resolved: smb: client: clear ce->tgthint in free_tgts() When free_tgts() frees all… (CVE-2026-89636)
A use-after-free vulnerability in the Linux kernel SMB client was resolved by ensuring the ce->tgthint pointer is cleared in the free_tgts() function after freeing all target structures. Without this fix, ce->tgthint could point to freed memory, potentially leading to undefined behavior.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel SMB client arises because the free_tgts() function frees all structures in ce->tlist but leaves ce->tgthint pointing to one of the freed cache_dfs_tgt structures. If ce->tgthint is accessed later without being reset, it results in a use-after-free condition. The fix sets ce->tgthint to NULL after freeing the elements to prevent this unsafe access.
Potential Impact
This use-after-free vulnerability could lead to undefined behavior in the kernel SMB client, such as memory corruption or crashes. No specific exploitation details or impacts beyond the use-after-free condition are provided.
Mitigation Recommendations
A fix has been implemented that sets ce->tgthint to NULL in free_tgts() after freeing the target structures. Users should apply the official Linux kernel update that includes this patch to remediate the vulnerability. Patch status is not explicitly confirmed in the provided data; verify with the vendor advisory for current remediation guidance.
In the Linux kernel, the following vulnerability has been resolved: smb: client: clear ce->tgthint in free_tgts() When free_tgts() frees all… (CVE-2026-89636)
Description
A use-after-free vulnerability in the Linux kernel SMB client was resolved by ensuring the ce->tgthint pointer is cleared in the free_tgts() function after freeing all target structures. Without this fix, ce->tgthint could point to freed memory, potentially leading to undefined behavior.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in the Linux kernel SMB client arises because the free_tgts() function frees all structures in ce->tlist but leaves ce->tgthint pointing to one of the freed cache_dfs_tgt structures. If ce->tgthint is accessed later without being reset, it results in a use-after-free condition. The fix sets ce->tgthint to NULL after freeing the elements to prevent this unsafe access.
Potential Impact
This use-after-free vulnerability could lead to undefined behavior in the kernel SMB client, such as memory corruption or crashes. No specific exploitation details or impacts beyond the use-after-free condition are provided.
Mitigation Recommendations
A fix has been implemented that sets ce->tgthint to NULL in free_tgts() after freeing the target structures. Users should apply the official Linux kernel update that includes this patch to remediate the vulnerability. Patch status is not explicitly confirmed in the provided data; verify with the vendor advisory for current remediation guidance.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-4452-h45j-w5mp
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-89636"]
Threat ID: 6aa4a00955bf5e2cf5a86664
Added to database: 09/12/2026, 00:42:49 UTC
Last enriched: 09/12/2026, 01:01:56 UTC
Last updated: 09/12/2026, 01:01:56 UTC
Views: 2
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.