CVE-2026-43379

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-08. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8

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.

CVSS v3
9.8
EG Score
9.8(high)
EPSS
18.9%
KEV
Not listed

Published

May 8, 2026

Last Modified

May 19, 2026

References (5)

Frequently asked(5)

What is CVE-2026-43379?
CVE-2026-43379 is a critical vulnerability published on May 8, 2026. In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in smblazyparentleasebreak_close() opinfo pointer obtained via rcudereference(fp->fopinfo) is being accessed after rcureadunlock() has been called. This creates a race condition where the memory could be…
When was CVE-2026-43379 disclosed?
CVE-2026-43379 was first published in the National Vulnerability Database on May 8, 2026, with the most recent update on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43379 actively exploited?
CVE-2026-43379 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43379?
CVE-2026-43379 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-43379?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43379, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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