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CVE-2026-43185

Linux Kernel denial of service

9.8 CRITICALEPSS 0.70%
  1. Published6 May 2026

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix signededness bug in smb_direct_prepare_negotiation() smb_direct_prepare_negotiation() casts an unsigned __u32 value from sp->max_recv_size and req->preferred_send_size to a signed int before computing min_t(int, ...). A maliciously provided preferred_send_size of 0x80000000 will return as smaller than max_recv_size, and then be used to set the maximum allowed alowed receive size for the next message. By sending a second message with a large value (>1420 bytes) the attacker can then achieve a heap buffer overflow. This fix replaces min_t(int, ...) with min_t(u32)

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Linux Kernel≥ 5.15 < 6.18.16 · ≥ 6.19 < 6.19.6 · 7.0

Remediation

Fixed in
Linux Kernel≥ 6.18.16

References

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Frequently asked

Is CVE-2026-43185 being actively exploited?

CVE-2026-43185 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.70%.

How severe is CVE-2026-43185?

CVE-2026-43185 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.70% probability of exploitation.

Which products are affected by CVE-2026-43185?

Affected products include Linux Kernel.

How do I fix CVE-2026-43185?

Upgrade affected software to a fixed version, for example Linux Kernel 6.18.16 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.