CVE-2026-43185

critical · 9.8

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)

9.8

CVSS

0.6%

EPSS (exploit prob.)

48th

EPSS percentile

2026-05-06

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-674

Affected products

Vendor	Product	Affected versions
linux	linux_kernel	>= 5.15, < 6.18.16
linux	linux_kernel	>= 6.19, < 6.19.6
linux	linux_kernel	7.0

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References

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-43185