Integer overflow in vt(4) CONS_HISTORY ioctl

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Summary

CVECVE-2026-49416
StatePUBLISHED
Assignerfreebsd
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-27 10:16:38 UTC
Updated2026-06-27 10:16:38 UTC
DescriptionThe CONS_HISTORY ioctl handler did not adequately validate the requested history size. A large value caused an integer overflow in the buffer size calculation, resulting in a heap allocation smaller than expected. Subsequent initialization of the buffer wrote beyond the end of the allocation. An unprivileged local user with access to a vt(4) device can trigger an out-of-bounds write in the kernel, potentially escalating privileges.

Risk And Classification

Problem Types: CWE-190 | CWE-190 CWE-190: Integer Overflow or Wraparound

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA FreeBSD FreeBSD affected 15.0-RELEASE p10 release Not specified
CNA FreeBSD FreeBSD affected 14.4-RELEASE p6 release Not specified
CNA FreeBSD FreeBSD affected 14.3-RELEASE p15 release Not specified

References

ReferenceSourceLinkTags
security.freebsd.org/advisories/FreeBSD-SA-26:34.vt.asc [email protected] security.freebsd.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Ed Maste (en)

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