Skip to content
CVE Tracker
  • Newest CVEsPage
  • Recently added to KEVPage
  • Rising exploitation (EPSS)Page
  • Weekly digestPage
  • StatisticsPage
  • WatchlistPage
  • API documentationPage
  • MCP serverPage
  • Data sourcesPage
  • ChangelogPage
  • AboutPage
  • How it's builtPage
Back

CVE-2026-45259

sigqueue(2) missing capability mode restriction

Medium6.5EPSS 0.13%
Published
Updated
Reserved
Assigned by
freebsd

Description

sigqueue(2) was marked as permitted in capability mode with the introduction of Capsicum in 2011, but the implementation of kern_sigqueue did not include a capability mode check restricting signal delivery to the calling process's own PID. A process in capability mode can use sigqueue(2) to send signals to any process it could signal following standard Unix permissions, bypassing the Capsicum sandbox restriction. A compromised sandboxed process could interfere with other processes, for example by sending SIGKILL or SIGSTOP. This could be any process running as the same user, or any process, for a superuser sandboxed process.

Scores

CVSS scores of CVE-2026-45259, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1Medium6.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
NVDNVD · Analyzed3.1Medium6.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.13% · top 97% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.

Weakness

Affected products

  • FreeBSD · FreeBSD

    • affected 15.0-RELEASE – < p10
    • affected 14.4-RELEASE – < p6
    • affected 14.3-RELEASE – < p15

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2026-45259 badge
[![CVE-2026-45259](https://trackcve.app/badge/CVE-2026-45259.svg)](https://trackcve.app/cve/CVE-2026-45259)

Record last updated .