CVE-2025-11840

What it actually does

The flaw permits a local out-of-bounds read in the vfinfo function of ldmisc.c when processing manipulated input, resulting in limited availability impact with no confidentiality or integrity loss.

Why it matters to the business

Organizations running the affected legacy package on Ubuntu 14.04 LTS face a low risk of local application crashes that could disrupt specific workflows, though the stable low EPSS and absence from KEV indicate minimal operational urgency or broad exposure.

How an attack unfolds

An attacker with local access supplies crafted input to the vulnerable vfinfo function in ldmisc.c to trigger an out-of-bounds read; public exploit code exists but has not matured into widespread use by named threat actors.

How to fix it

Upgrade openslp-dfsg on Ubuntu 14.04 LTS to the fixed version 1.2.1-9ubuntu0.2 and apply patch 16357; remove or isolate any remaining vulnerable instances of the legacy package.

How to confirm the fix worked

Confirm the installed package version matches or exceeds 1.2.1-9ubuntu0.2, recompile or test the binary to ensure the vfinfo function no longer permits out-of-bounds reads, and verify no unpatched copies remain in the environment.

Typical attack path

1. Gain local shell or user access on the target system
2. Craft input that triggers the vfinfo function in ldmisc.c
3. Execute the affected binary with the malicious input to induce the out-of-bounds read and potential crash

How to detect it

Review local process execution logs and crash reports for the affected binary; search for repeated invocations of the vulnerable component by untrusted local users.

What your security team should do

• Prioritize patching legacy Ubuntu 14.04 systems running openslp-dfsg within the next maintenance window
• Audit local user privileges to reduce the attack surface for local-only flaws
• Monitor EPSS and exploit maturity updates for any future increase in risk