Bug 2436769 (CVE-2026-23043)

Summary: CVE-2026-23043 kernel: btrfs: fix NULL pointer dereference in do_abort_log_replay()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A NULL pointer dereference vulnerability was found in the Linux kernel's Btrfs filesystem log replay code. When btrfs_alloc_path() fails in replay_one_buffer() due to memory allocation failure, wc->subvol_path is left NULL. Subsequently, btrfs_abort_log_replay() calls do_abort_log_replay() which unconditionally dereferences wc->subvol_path to print debug information, causing a kernel crash.
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Description OSIDB Bzimport 2026-02-04 17:02:29 UTC 
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().
Comment 1 Jon Moroney 2026-02-05 00:41:37 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026020439-CVE-2026-23043-4975@gregkh/T