Vulnerability · Published Oct 8, 2026 · Assigned by VulnCheck
CVE-2026-107635Dislocker through 0.7.3 Out-of-Bounds Heap Read via VMK/FVEK Datum Size Underflow
Medium 6.1
In plain English
A medium-severity security flaw in dislocker from Aorimn. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Dislocker through 0.7.3 contains an integer underflow vulnerability in get_vmk() and get_fvek() that allows attackers to trigger out-of-bounds heap reads via crafted datum sizes. Attackers can supply a malicious BitLocker volume image with a datum_size smaller than the 36-byte AES-CCM header, causing hexdump() to over-read and crash dislocker.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | dislocker | no fix listed | DEBIAN-CVE-2026-107635 |
| Debian:13 | dislocker | no fix listed | DEBIAN-CVE-2026-107635 |
| Debian:14 | dislocker | 0.7.4-1 | DEBIAN-CVE-2026-107635 |
| Ubuntu:22.04:LTS | dislocker | no fix listed | UBUNTU-CVE-2026-107635 |
| Ubuntu:24.04:LTS | dislocker | no fix listed | UBUNTU-CVE-2026-107635 |
| Ubuntu:26.04:LTS | dislocker | no fix listed | UBUNTU-CVE-2026-107635 |
| Ubuntu:26.10 | dislocker | no fix listed | UBUNTU-CVE-2026-107635 |
Affected products (as reported)
Weakness: CWE-191 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
References
- Patch Commit patch
- https://github.com/Aorimn/dislocker/blob/v0.7.3/src/metadata/vmk.c#L146-L180 technical-description
- https://github.com/Aorimn/dislocker/blob/v0.7.3/src/metadata/fvek.c#L90-L105 technical-description
- https://github.com/Aorimn/dislocker product
- VulnCheck Advisory: Dislocker through 0.7.3 Out-of-Bounds Heap Read via VMK/FVEK Datum Size Underflow third-party-advisory