CVE-2026-43185
highpriority · track · 0EPSS 0.008 · 57 %ileDEEURUUSEPSS · scored 2026-10-27
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.8–9.8
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (37)
Products and version ranges known to be affected.
- Red Hat Enterprise Linux 7 Extended Lifecycle Supportall versionscert_bundDEcpe:/o:redhat:enterprise_linux:7_extended_lifecycle_support
advisories (1)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-1405Linux Kernel: Mehrere SchwachstellenDeutsch2026-05-06csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um nicht spezifizierte Angriffe durchzuführen, möglicherweise Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren oder offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (10)
External citations — patches, advisories, analysis.
- https://nvd.nist.gov/vuln/detail/CVE-2026-43185cnnvd
- https://www.kernel.org/category/releases.htmlPatchcnnvd
- https://git.kernel.org/stable/c/55abc475d096da4a5356b6efb0cfdc6156bc1550enisa_euvd
- https://git.kernel.org/stable/c/6b4f875aac344cdd52a1f34cc70ed2f874a65757enisa_euvd
- https://git.kernel.org/stable/c/ceae058eb707ddd0d68f0872f9d9f23b7c30c37benisa_euvd
- https://git.kernel.org/stable/c/55abc475d096da4a5356b6efb0cfdc6156bc1550Patchnvd
- https://git.kernel.org/stable/c/56eab82fa6fb5ca024b0514e249d40d9b23ee5a7nvd
- https://git.kernel.org/stable/c/6b4f875aac344cdd52a1f34cc70ed2f874a65757Patchnvd
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