CVE-2025-71159 — Use After Free in Linux

CWE-416 — Use After FreeCWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition6 documents6 sources
Severity
7.8HIGHNVD
EPSS
0.0%
top 94.95%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
LinuxLinux KernelDebian Linux
Timeline
PublishedJan 23

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free warning in btrfs_get_or_create_delayed_node() Previously, btrfs_get_or_create_delayed_node() set the delayed_node's refcount before acquiring the root->delayed_nodes lock. Commit e8513c012de7 ("btrfs: implement ref_tracker for delayed_nodes") moved refcount_set inside the critical section, which means there is no longer a memory barrier between setting the refcount and setting btrfs_inode->delayed_nod…

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9

Affected Packages4 packages

▶NVDlinux/linux_kernel6.18 — 6.18.6+1
▶Debianlinux/linux_kernel< 6.18.8-1
▶CVEListV5linux/linuxe8513c012de75fd65e2df5499572bc6ef3f6e409 — c8385851a5435f4006281828d428e5d0b0bbf8af+2
▶debiandebian/linux< linux 6.18.8-1 (forky)

Patches

Patch: git.kernel.org ↗Patch: git.kernel.org ↗

🔴Vulnerability Details

2
GHSA
GHSA-h6p2-5h78-3xmh: In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free warning in btrfs_get_or_create_delayed_node() Previous↗2026-01-23
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OSV
CVE-2025-71159: In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free warning in btrfs_get_or_create_delayed_node() Previously↗2026-01-23
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📋Vendor Advisories

2
Red Hat
kernel: btrfs: fix use-after-free warning in btrfs_get_or_create_delayed_node()↗2026-01-23
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Debian
CVE-2025-71159: linux - In the Linux kernel, the following vulnerability has been resolved: btrfs: fix ...↗2025
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🕵️Threat Intelligence

1
Wiz
CVE-2025-71159 Impact, Exploitability, and Mitigation Steps | Wiz↗
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