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CVE-2026-58083: Use After Free

🗓️ 19 Aug 2026 00:00:00Reported by Rapid7Type 
rapid7
 rapid7
🔗 www.rapid7.com

While the kernel was copying knotes during fork, a knote with a timer-based filter could fire and be enqueued on the kqueue's active list before the copy was complete. The copy routine did not account for this and could enqueue the new knote a sec...

Related
Refs
ReporterTitlePublishedViews
Family
freebsd
FreeBSD
FreeBSD -- Use-after-free in kqueue copy-on-fork
29 Jul 202600:00
–freebsd
circl
Circl
CVE-2026-58083
19 Aug 202612:15
–circl
cve
CVE
CVE-2026-58083
19 Aug 202607:28
–cve
cvelist
Cvelist
CVE-2026-58083 Use-after-free in kqueue copy-on-fork
19 Aug 202607:28
–cvelist
euvd
EUVD
EUVD-2026-62351
19 Aug 202607:28
–euvd
freebsd_advisory
FreeBSD Advisory
FreeBSD-SA-26:50.kqueue
29 Jul 202600:00
–freebsd_advisory
nessus
Tenable Nessus
FreeBSD : FreeBSD -- Use-after-free in kqueue copy-on-fork (a4e4a74c-8bb7-11f1-a6ab-bc241121aa0a)
30 Jul 202600:00
–nessus
nvd
NVD
CVE-2026-58083
19 Aug 202608:17
–nvd
packetstormnews
Packet Storm News
FreeBSD Security Advisory - FreeBSD-SA-26:50.kqueue
29 Jul 202600:00
–packetstormnews
ptsecurity
Positive Technologies
PT-2026-78316
19 Aug 202600:00
–ptsecurity
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31 Aug 2026 00:00Current
CVSS 3.18.4
EPSS0.00123
SSVC
0