CVE-2026-72381
Kernel ksmbd use-after-free in SMB durable reconnects causing memory corruption and crashes.
Is CVE-2026-72381 being exploited?
Not confirmed. CVE-2026-72381 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.64% probability of exploitation in the next 30 days.
How severe is CVE-2026-72381?
CVE-2026-72381 is rated Critical. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-72381?
Yes. A fix has been recorded for CVE-2026-72381. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-72381 affect?
CVE-2026-72381 affects Linux kernel ksmbd module (SMB server), Linux file servers using ksmbd. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-72381?
Upgrade to a patched kernel or apply the ksmbd fix; restart SMB services and restrict SMB access until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote SMB client can trigger a kernel use-after-free leading to crashes, memory corruption and possible privilege escalation.
Immediate action required
- affected>= 712cdf917e77a6444ce3836874829d770db20ee6 and < fb978d72052704c6b06c6b0f129fcd60b77169f5
- affected>= c7f0f0d01c88bdcb8b1694d7d321670013f7ed7d and < 93d4d46bf9d442a12ea87278049ec416962c627f
- affected>= 00ce8d6789dae72d042a4522264964c72891ca37 and < 5a5ac2852cd326529d02f778bc1aa6184701f4d7
- affected>= 49110a8ce654bbe56bef7c5e44cce31f4b102b8a and < ed98719be41389d416953b8ef9f07a07dfea6b2b
- affected>= 49110a8ce654bbe56bef7c5e44cce31f4b102b8a and < 38637163501fd9e2f684b8cd275d0db5d79f37c6
- affectedc908c853f304a4969b5aa10eba0b50350cc65b80
- affected>= 6.6.142 and < 6.6.145
- affected>= 6.12.92 and < 6.12.97
- affected>= 6.18.25 and < 6.18.40
- affected>= 7.0.2 and < 7.1
- affected7.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.