EUVD-2026-62345
GHSA-vv7x-5v76-w79j
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local execution of a Linux binary required (AV:L, PR:L); purely a read-only kernel stack leak with no write or availability impact.
Primary rating from Vendor (freebsd).
CVSS VectorVendor: freebsd
Lifecycle Timeline
4DescriptionCVE.org
The Linux waitid() implementation translates a FreeBSD siginfo_t struct into a stack-declared Linux siginfo_t. It did not first zero the stack struct.
An unprivileged user may observe 104 bytes of uninitialized kernel stack data, which may contain sensitive information.
AnalysisAI
Kernel stack data disclosure in FreeBSD's Linux compatibility layer (linuxulator) allows any unprivileged local user to read up to 104 bytes of uninitialized kernel stack memory per waitid() invocation. The root cause is a missing zero-initialization of the destination siginfo_t buffer during FreeBSD-to-Linux struct translation, exposing residual kernel stack contents such as pointers and potentially cryptographic material. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) a local, authenticated user account with at minimum low privileges (PR:L per CVSS vector); (2) the FreeBSD Linux compatibility layer (linuxulator kernel module - `linux.ko` or `linux64.ko`) to be loaded and active, which is NOT the default on most FreeBSD server configurations and must be explicitly enabled via `linux_enable="YES"` in `/etc/rc.conf` or manually loaded; (3) the ability to execute a Linux-format ELF binary or otherwise invoke the `waitid()` syscall via the Linux ABI. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N is consistent with the technical description: local, low-privilege access, no user interaction, confidentiality impact only with no integrity or availability consequence. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released patches per FreeBSD Security Advisory FreeBSD-SA-26:47.linux, available at https://security.freebsd.org/advisories/FreeBSD-SA-26:47.linux.asc. … Detailed patch versions, workarounds, and compensating controls in full report. |
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The x86-64 kernel system-call functionality in Xen 4.1.2 and earlier, as used in Citrix XenServer 6.0.2 and earlier and
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Integer overflow in the _gd2GetHeader function in gd_gd2.c in the GD Graphics Library (aka libgd) before 2.2.3, as used
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NFS in a BSD derived codebase, as used in OpenBSD through 7.4 and FreeBSD through 14.0-RELEASE, allows remote attackers
Same weakness CWE-908 – Use of Uninitialized Resource
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External POC / Exploit Code
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