Kernel-level heap overflow in ksmbd could allow remote code execution; widely used kernel component.
CVE-2026-43185
Kernel heap overflow in ksmbd SMB Direct negotiation.
Is CVE-2026-43185 being exploited?
Not confirmed. CVE-2026-43185 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 0.62% probability of exploitation in the next 30 days.
How severe is CVE-2026-43185?
CVE-2026-43185 is rated Critical with a CVSS score of 9.8. 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-2026-43185?
Yes. A fix has been recorded for CVE-2026-43185. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-43185 affect?
CVE-2026-43185 affects Linux kernel (ksmbd) with SMB Direct enabled. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-43185?
Apply patched kernel update; reboot if required.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker could trigger a kernel heap overflow via crafted SMB Direct messages, risking kernel compromise.
Patch when possible
- affected>= 0626e6641f6b467447c81dd7678a69c66f7746cf and < ceae058eb707ddd0d68f0872f9d9f23b7c30c37b
- affected>= 0626e6641f6b467447c81dd7678a69c66f7746cf and < 55abc475d096da4a5356b6efb0cfdc6156bc1550
- affected>= 0626e6641f6b467447c81dd7678a69c66f7746cf and < 6b4f875aac344cdd52a1f34cc70ed2f874a65757
- affected5.15
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.