CVE-2024-56749 dlm: fix dlm_recover_members refcount on error

What is CVE-2024-56749?

CVE-2024-56749 is a high-severity memory corruption vulnerability in Linux kernel, published on 29 Dec 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

dlm: fix dlm_recover_members refcount on error

If dlm_recover_members() fails we don't drop the references of the previous created root_list that holds and keep all rsbs alive during the recovery. It might be not an unlikely event because ping_members() could run into an -EINTR if another recovery progress was triggered again.

Which versions are affected by CVE-2024-56749?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-56749?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2024-56749 being exploited?

There is no known exploitation of CVE-2024-56749 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 BELL-CVE-2024-56749, DEBIAN-CVE-2024-56749, GHSA-9r43-p7wr-7396, UBUNTU-CVE-2024-56749.