CVE-2024-42079 gfs2: Fix NULL pointer dereference in gfs2_log_flush

What is CVE-2024-42079?

CVE-2024-42079 is a medium-severity vulnerability in Linux kernel, published on 29 Jul 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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

gfs2: Fix NULL pointer dereference in gfs2_log_flush

In gfs2_jindex_free(), set sdp->sd_jdesc to NULL under the log flush lock to provide exclusion against gfs2_log_flush().

In gfs2_log_flush(), check if sdp->sd_jdesc is non-NULL before dereferencing it. Otherwise, we could run into a NULL pointer dereference when outstanding glock work races with an unmount (glock_work_func -> run_queue -> do_xmote -> inode_go_sync -> gfs2_log_flush).

Weakness: CWE-476

Which versions are affected by CVE-2024-42079?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-42079?

Apply the vendor's patch.

Is CVE-2024-42079 being exploited?

There is no known exploitation of CVE-2024-42079 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-47118, AZL-47166, BELL-CVE-2024-42079, DEBIAN-CVE-2024-42079, GHSA-7wph-5wjx-7rgv, ROOT-OS-DEBIAN-11-CVE-2024-42079 and 2 more.