CVE-2026-68099: ksmbd: restore DACL size on check_add_overflow() to avoid malformed ACL

mediumCVSS 4.3CVE-2026-68099

CSIRTS triage

Other

What: DACL size restoration in ksmbd to prevent malformed ACL from check_add_overflow() error.
Who is affected: Systems running ksmbd SMB server implementation in the Linux kernel.
Urgency: Medium priority; CVSS 4.3 affecting access control list handling in SMB server.
Action: Update Linux kernel to include the ksmbd DACL size fix.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 4.3
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68099

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-680990.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-68099	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for ksmbd

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-74522: In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free …nvd · 2026-08-15
criticalCVE-2026-74521: In the Linux kernel, the following vulnerability has been resolved: ksmbd: use memcmp() to com…nvd · 2026-08-15
unknownCVE-2026-74494: In the Linux kernel, the following vulnerability has been resolved: ksmbd: reject repeated SMB…nvd · 2026-08-15
highCVE-2026-72492: In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free …nvd · 2026-08-15
criticalCVE-2026-72422: In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free …nvd · 2026-08-15
highCVE-2026-72382: In the Linux kernel, the following vulnerability has been resolved: ksmbd: reject undersized D…nvd · 2026-08-15