CVE-2026-53048 gfs2: prevent NULL pointer dereference during unmount

What is CVE-2026-53048?

CVE-2026-53048 is a medium-severity vulnerability in Linux kernel, published on 24 Jun 2026. 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: prevent NULL pointer dereference during unmount

When flushing out outstanding glock work during an unmount, gfs2_log_flush() can be called when sdp->sd_jdesc has already been deallocated and sdp->sd_jdesc is NULL. Commit 35264909e9d1 ("gfs2: Fix NULL pointer dereference in gfs2_log_flush") added a check for that to gfs2_log_flush() itself, but it missed the sdp->sd_jdesc dereference in gfs2_log_release(). Fix that.

Weakness: CWE-476

Which versions are affected by CVE-2026-53048?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-53048?

Apply the vendor's patch.

Is CVE-2026-53048 being exploited?

There is no known exploitation of CVE-2026-53048 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-2026-53048, DEBIAN-CVE-2026-53048, GHSA-x2x3-cmvw-67w8, ROOT-OS-UBUNTU-2204-CVE-2026-53048, ROOT-OS-UBUNTU-2404-CVE-2026-53048, UBUNTU-CVE-2026-53048.