CVE-2007-4849

What it is

JFFS2, as used on One Laptop Per Child (OLPC) build 542 and possibly other Linux systems, when POSIX ACL support is enabled, does not properly store permissions during (1) inode creation or (2) ACL setting, which might allow local users to access restricted files or directories after a remount of a filesystem, related to "legacy modes" and an inconsistency between dentry permissions and inode permissions.

At a glance

Exploitability

Can be exploited locally on the machine without logging in. Limited direct impact.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2007-09-12 20:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 22:44 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.3% in the next 30 days (EPSS).
• Severity: 4.4 MEDIUM (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2007-09-12 20:17 UTC

Last modified

2026-06-16 22:44 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-264

Record status

Modified

Affected

• One Laptop Per Child Olpc Linux build_542

Attack profile CVSS 2.0 · 4.4

Attack vector

Local

Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2007-4849.md and follow it. Check whether this project is affected by CVE-2007-4849. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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