ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()
Summary
| CVE | CVE-2026-43379 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-08 15:16:49 UTC |
| Updated | 2026-05-11 08:16:12 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.000180000 probability, percentile 0.049330000 (date 2026-05-10)
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | DECLARED | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 27b40b7bfcd121fe13a150ffe11957630cf49246 bf4d66d72e4a9e268c1012c331ce9eaedb5e2086 git | Not specified |
| CNA | Linux | Linux | affected 5fb282ba4fef8985a5acf2b32681f2ec07732561 960699317d39f46611f4ebeb69edc567c1f4e6b6 git | Not specified |
| CNA | Linux | Linux | affected 5fb282ba4fef8985a5acf2b32681f2ec07732561 dbbd328cf58261ca239756fe1c0d10c9518d3399 git | Not specified |
| CNA | Linux | Linux | affected 5fb282ba4fef8985a5acf2b32681f2ec07732561 b3568347c51c46e2cabc356bc34676df98296619 git | Not specified |
| CNA | Linux | Linux | affected 5fb282ba4fef8985a5acf2b32681f2ec07732561 eac3361e3d5dd8067b3258c69615888eb45e9f25 git | Not specified |
| CNA | Linux | Linux | affected 6.9 | Not specified |
| CNA | Linux | Linux | unaffected 6.9 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.130 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.78 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.19 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.9 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/dbbd328cf58261ca239756fe1c0d10c9518d3399 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/bf4d66d72e4a9e268c1012c331ce9eaedb5e2086 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/eac3361e3d5dd8067b3258c69615888eb45e9f25 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/960699317d39f46611f4ebeb69edc567c1f4e6b6 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/b3568347c51c46e2cabc356bc34676df98296619 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.