CVE-2026-23043
Unknown Unknown - Not Provided
NULL Pointer Dereference in Linux Kernel btrfs Component

Publication date: 2026-02-04

Last updated on: 2026-02-04

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix NULL pointer dereference in do_abort_log_replay() Coverity reported a NULL pointer dereference issue (CID 1666756) in do_abort_log_replay(). When btrfs_alloc_path() fails in replay_one_buffer(), wc->subvol_path is NULL, but btrfs_abort_log_replay() calls do_abort_log_replay() which unconditionally dereferences wc->subvol_path when attempting to print debug information. Fix this by adding a NULL check before dereferencing wc->subvol_path in do_abort_log_replay().
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Meta Information
Published
2026-02-04
Last Modified
2026-02-04
Generated
2026-06-16
AI Q&A
2026-02-04
EPSS Evaluated
2026-06-15
NVD
CVE-2026-23043
EUVD
EUVD-2026-5504
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux_kernel btrfs *
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability is a NULL pointer dereference issue in the Linux kernel's btrfs filesystem code, specifically in the function do_abort_log_replay().

When the function btrfs_alloc_path() fails during replay_one_buffer(), a pointer wc->subvol_path becomes NULL. However, do_abort_log_replay() calls this pointer without checking if it is NULL, leading to a NULL pointer dereference when trying to print debug information.

The fix involves adding a NULL check before dereferencing wc->subvol_path to prevent this issue.

Impact Analysis

A NULL pointer dereference in kernel code can cause the affected system to crash or become unstable, potentially leading to a denial of service.

Since this occurs in the btrfs filesystem code, it could impact systems using btrfs by causing kernel panics or system crashes when the vulnerable code path is triggered.

Compliance Impact

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Detection Guidance

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