8.4

CVE-2026-49428

posixshm: system calls can incorrectly free memory of largepage objects

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Freebsd ≫ Freebsd Version 14.3 Update -
Freebsd ≫ Freebsd Version 14.3 Update p1
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Freebsd ≫ Freebsd Version 14.4 Update -
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Freebsd ≫ Freebsd Version 14.4 Update rc1
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Freebsd ≫ Freebsd Version 15.0 Update p4
Freebsd ≫ Freebsd Version 15.0 Update p5
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Freebsd ≫ Freebsd Version 15.1 Update -
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Freebsd ≫ Freebsd Version 15.1 Update rc3-p1
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.29% 0.217
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
CISA-ADP 8.4 2.5 5.9
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes

The product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified.

https://security.freebsd.org/advisories/FreeBSD-SA-26:44.posixshm.asc
Vendor Advisory