CVE-2026-49425 json
Kernel stack disclosure in 32-bit compatibility support
published 2026-08-19 2 mo ago modified 2026-10-27 13 d ago also EUVD-2026-62346
- cvss
- 5.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 4%
- public exploits
- 0
- none known
Summary
The compat32 kevent() handler translates a 64-bit kevent struct into a stack- declared 32-bit struct. It did not first zero the stack struct.
An unprivileged user may observe a small amount of uninitialized kernel stack data, which may contain sensitive information.
Patch / fix
- FreeBSD FreeBSD p7, p11, p16
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| CNA | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected products
- FreeBSD FreeBSD
Classification
- Weakness
-
- CWE-908 Use of Uninitialized Resource
References
-
security.freebsd.org
/advisories/FreeBSD-SA-26:48.compat32.asc
vendor-advisory
Sources
- CVE List CVE-2026-49425
- NVD CVE-2026-49425
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