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CVE-2026-49428

posixshm: system calls can incorrectly free memory of largepage objects

High8.4EPSS 0.34%
Published
Updated
Reserved
Assigned by
freebsd

Description

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.

Scores

CVSS scores of CVE-2026-49428, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1High8.4CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Analyzed3.1High8.4CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.34% · top 72% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.4.

Weakness

Affected products

  • FreeBSD · FreeBSD

    • affected 15.1-RELEASE – < p1
    • affected 15.0-RELEASE – < p11
    • affected 14.4-RELEASE – < p7
    • affected 14.3-RELEASE – < p16

References (1)

Sources

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

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Record last updated .