Vulnerability details
CVE-2026-49428
FreeBSD FreeBSD
posixshm: system calls can incorrectly free memory of largepage objects
CVSS 3.1
8.4High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.4High | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| FreeBSD | FreeBSD | 14.3-RELEASE ≤ v < p16 | CVEProject cvelistV5 (CNA) |
| FreeBSD | FreeBSD | 14.4-RELEASE ≤ v < p7 | CVEProject cvelistV5 (CNA) |
| FreeBSD | FreeBSD | 15.0-RELEASE ≤ v < p11 | CVEProject cvelistV5 (CNA) |
| FreeBSD | FreeBSD | 15.1-RELEASE ≤ v < p1 | CVEProject cvelistV5 (CNA) |
References and advisories
1
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Details
- Published
- 2026-08-19
- Last updated
- 2026-08-20
- State
- Published
- Assigner (CNA)
- freebsd
Exploit prediction (EPSS)
0.34%
Probability of exploitation in 30 days
27.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-915Improperly Controlled Modification of Dynamically-Determined Object Attributes