High 8.4Published Aug 19, 2026

CVE-2026-49428posixshm: system calls can incorrectly free memory of largepage objects

Updated under an hour ago (Oct 26, 2026, 8:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

Certain system calls, such open(2) with the O_TRUNC flag set, and fspacectl(2), could incorrectly free memory in largepage objects. These operations are not permitted on largepage objects, but the implementation did not verify this. An unprivileged local user can abuse the bug to access freed kernel memory. This can be exploited to escalate privileges.

CVSS: 8.4 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-915
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: freebsd
NVD analysis: Analyzed
Record last updated: Aug 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

FreeBSD FreeBSD freebsd:freebsd (from the name)	from 15.1-RELEASE before p1; from 15.0-RELEASE before p11; from 14.4-RELEASE before p7; from 14.3-RELEASE before p16	CNA record
freebsd freebsd freebsd:freebsd	14.3; 14.3; 14.3; 14.3; 14.3; 14.3; 14.3; 14.3; and 30 more ranges	NVD

References

References

https://security.freebsd.org/advisories/FreeBSD-SA-26:44.posixshm.asc	vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.