CVE-2026-43379 Details
Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close() opinfo pointer obtained via rcu_dereference(fp->f_opinfo) is being accessed after rcu_read_unlock() has been called. This creates a race condition where the memory could be freed by a concurrent writer between the unlock and the subsequent pointer dereferences (opinfo->is_lease, etc.), leading to a use-after-free.
A use-after-free vulnerability has been identified in the Linux kernel's ksmbd component, specifically within the function responsible for managing parent lease breaks. This issue arises because the operation information pointer, accessed through a read-copy-update (RCU) mechanism, is being dereferenced after the RCU read lock has been released. This creates a race condition, allowing concurrent write operations to free the memory before it is accessed, leading to a use-after-free scenario. The vulnerability affects several versions of the Linux kernel.
Users can upgrade to the latest stable version of the Linux kernel, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/960699317d39f46611f4ebeb69edc567c1f4e6b6 | kernel.org | Patch |
| https://git.kernel.org/stable/c/b3568347c51c46e2cabc356bc34676df98296619 | kernel.org | Patch |
| https://git.kernel.org/stable/c/bf4d66d72e4a9e268c1012c331ce9eaedb5e2086 | kernel.org | Patch |
| https://git.kernel.org/stable/c/dbbd328cf58261ca239756fe1c0d10c9518d3399 | kernel.org | Patch |
| https://git.kernel.org/stable/c/eac3361e3d5dd8067b3258c69615888eb45e9f25 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.6.32, < 6.6.130 >= 6.9, < 6.12.78 >= 6.13, < 6.18.19 >= 6.19, < 6.19.9 7.0 rc1 7.0 rc2 7.0 rc3 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 19, 2026 | Initial Analysis | [email protected] |
| May 11, 2026 | CVE Modified | kernel.org |
| May 8, 2026 | New CVE Received | kernel.org |