CVE-2023-2513 — A use-after-free vulnerability was found in the Linux kernel's ext4 filesystem i

A use-after-free vulnerability was found in the Linux kernel's ext4 filesystem in the way it handled the extra inode size for extended attributes. This flaw could allow a privileged local user to cause a system crash or other undefined behaviors.

01What is this vulnerability?

A use-after-free vulnerability was found in the Linux kernel's ext4 filesystem in the way it handled the extra inode size for extended attributes. This flaw could allow a privileged local user to cause a system crash or other undefined behaviors.

02Affected products

Vendor	Product	Versions
n	a / Linux kernel ext4 filesystem	Fixed in kernel 6.0-rc1

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-05-08T00:00:00.000Z
• Last modified: 2025-04-23T16:21:53.558Z

09References

• lore.kernel.org — https://lore.kernel.org/all/20220616021358.2504451-1-libaokun1%40huawei.com/
• github.com — https://github.com/torvalds/linux/commit/67d7d8ad99be
• bugzilla.redhat.com — https://bugzilla.redhat.com/show_bug.cgi?id=2193097