CVE-2026-49427: posixshm: largepage shared memory objects not explicitly wired
Vendor fix available · Affected: FreeBSD · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 43% of scored CVEs
DescriptionCVE.org
Pages belonging to largepage shared memory objects were not explicitly wired. When sendfile(2) transmitted such an object with the SF_NOCACHE flag, it freed the underlying pages after transmission even though existing mappings still referred to them. An unprivileged local user can abuse the bug to access freed kernel memory. This can be exploited to escalate privileges.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- FreeBSD · FreeBSDfrom 15.1-RELEASE before p1; from 15.0-RELEASE before p11; from 14.4-RELEASE before p7; from 14.3-RELEASE before p16
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- FreeBSD
- Published
- August 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-49427 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.