CVE-2026-43379
ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()
CVSS Score
9.8
EPSS Score
0.1%
EPSS Percentile
19th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | May 8, 2026 |
| Last Updated | May 23, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Linux / Linux
27b40b7bfcd121fe13a150ffe11957630cf49246 < bf4d66d72e4a9e268c1012c331ce9eaedb5e2086 5fb282ba4fef8985a5acf2b32681f2ec07732561 < 960699317d39f46611f4ebeb69edc567c1f4e6b6 5fb282ba4fef8985a5acf2b32681f2ec07732561 < dbbd328cf58261ca239756fe1c0d10c9518d3399 5fb282ba4fef8985a5acf2b32681f2ec07732561 < b3568347c51c46e2cabc356bc34676df98296619 5fb282ba4fef8985a5acf2b32681f2ec07732561 < eac3361e3d5dd8067b3258c69615888eb45e9f25 6.6.32 < 6.6.130
Linux / Linux
6.9
References
git.kernel.org: https://git.kernel.org/stable/c/bf4d66d72e4a9e268c1012c331ce9eaedb5e2086 git.kernel.org: https://git.kernel.org/stable/c/960699317d39f46611f4ebeb69edc567c1f4e6b6 git.kernel.org: https://git.kernel.org/stable/c/dbbd328cf58261ca239756fe1c0d10c9518d3399 git.kernel.org: https://git.kernel.org/stable/c/b3568347c51c46e2cabc356bc34676df98296619 git.kernel.org: https://git.kernel.org/stable/c/eac3361e3d5dd8067b3258c69615888eb45e9f25