CVE-2023-1249 — A use-after-free flaw was found in the Linux kernel’s core dump subsystem

A use-after-free flaw was found in the Linux kernel’s core dump subsystem. This flaw allows a local user to crash the system. Only if patch 390031c94211 ("coredump: Use the vma snapshot in fill_files_note") not applied yet, then kernel could be affected.

01What is this vulnerability?

A use-after-free flaw was found in the Linux kernel’s core dump subsystem. This flaw allows a local user to crash the system. Only if patch 390031c94211 ("coredump: Use the vma snapshot in fill_files_note") not applied yet, then kernel could be affected.

02Affected products

Vendor	Product	Versions
n	a / Kernel	Linux kernel 5.18-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: 2023-03-23T00:00:00.000Z
• Last modified: 2025-03-19T15:45:25.837Z

09References

• patchwork.kernel.org — https://patchwork.kernel.org/project/linux-fsdevel/patch/87iltzn3nd.fsf_-_%40ema…
• packetstormsecurity.com — http://packetstormsecurity.com/files/171912/CentOS-Stream-9-Missing-Kernel-Secur…