CVE-2023-1249 Use after free in Kernel

What is CVE-2023-1249?

CVE-2023-1249 is a medium-severity use after free vulnerability in Linux kernel, published on 23 Mar 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-416

Which versions are affected by CVE-2023-1249?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-1249?

Apply the vendor's patch.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2023-1249 being exploited?

There is no known exploitation of CVE-2023-1249 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-25740, DEBIAN-CVE-2023-1249, GHSA-98m9-9rrp-w52h, UBUNTU-CVE-2023-1249.