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Echo: linux: security update to 6.1.147-1

medium Tenable Cloud Security Plugin ID 460372

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - In the Linux kernel, the following vulnerability has been resolved: btrfs: fix a race between renames and
 directory logging We have a race between a rename and directory inode logging that if it happens and we
 crash/power fail before the rename completes, the next time the filesystem is mounted, the log replay code
 will end up deleting the file that was being renamed. This is best explained following a step by step
 analysis of an interleaving of steps that lead into this situation. Consider the initial conditions: 1) We
 are at transaction N; 2) We have directories A and B created in a past transaction (< N); 3) We have inode
 X corresponding to a file that has 2 hardlinks, one in directory A and the other in directory B, so we'll
 name them as "A/foo_link1" and "B/foo_link2". Both hard links were persisted in a past transaction (< N);
 4) We have inode Y corresponding to a file that as a single hard link and is located in directory A, we'll
 name it as "A/bar". This file was also persisted in a past transaction (< N). The steps leading to a file
 loss are the following and for all of them we are under transaction N: 1) Link "A/foo_link1" is removed,
 so inode's X last_unlink_trans field is updated to N, through btrfs_unlink() -> btrfs_record_unlink_dir();
 2) Task A starts a rename for inode Y, with the goal of renaming from "A/bar" to "A/baz", so we enter
 btrfs_rename(); 3) Task A inserts the new BTRFS_INODE_REF_KEY for inode Y by calling
 btrfs_insert_inode_ref(); 4) Because the rename happens in the same directory, we don't set the
 last_unlink_trans field of directoty A's inode to the current transaction id, that is, we don't cal
 btrfs_record_unlink_dir(); 5) Task A then removes the entries from directory A (BTRFS_DIR_ITEM_KEY and
 BTRFS_DIR_INDEX_KEY items) when calling __btrfs_unlink_inode() (actually the dir index item is added as a
 delayed item, but the effect is the same); 6) Now before task A adds the new entry "A/baz" to directory A
 by calling btrfs_add_link(), another task, task B is logging inode X; 7) Task B starts a fsync of inode X
 and after logging inode X, at btrfs_log_inode_parent() it calls btrfs_log_all_parents(), since inode X has
 a last_unlink_trans value of N, set at in step 1; 8) At btrfs_log_all_parents() we search for all parent
 directories of inode X using the commit root, so we find directories A and B and log them. Bu when logging
 direct A, we don't have a dir index item for inode Y anymore, neither the old name "A/bar" nor for the new
 name "A/baz" since the rename has deleted the old name but has not yet inserted the new name - task A
 hasn't called yet btrfs_add_link() to do that. Note that logging directory A doesn't fallback to a
 transaction commit because its last_unlink_trans has a lower value than the current transaction's id (see
 step 4); 9) Task B finishes logging directories A and B and gets back to btrfs_sync_file() where it calls
 btrfs_sync_log() to persist the log tree; 10) Task B successfully persisted the log tree, btrfs_sync_log()
 completed with success, and a power failure happened. We have a log tree without any directory entry for
 inode Y, so the log replay code deletes the entry for inode Y, name "A/bar", from the subvolume tree since
 it doesn't exist in the log tree and the log tree is authorative for its index (we logged a
 BTRFS_DIR_LOG_INDEX_KEY item that covers the index range for the dentry that corresponds to "A/bar").
 Since there's no other hard link for inode Y and the log replay code deletes the name "A/bar", the file is
 lost. The issue wouldn't happen if task B synced the log only after task A called btrfs_log_new_name(),
 which would update the log with the new name for inode Y ("A/bar"). Fix this by pinning the log root
 during renames before removing the old directory entry, and unpinning af ---truncated--- (CVE-2025-38365)

Solution

Update the linux library and its related packages to version 6.1.147-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2025-38365

Plugin Details

Severity: Medium

ID: 460372

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.37

CVSS v2

Risk Factor: Low

Base Score: 3.8

Temporal Score: 2.8

Vector: CVSS2#AV:L/AC:H/Au:S/C:N/I:N/A:C

CVSS Score Source: CVE-2025-38365

CVSS v3

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 4.1

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 9/15/2025

Vulnerability Publication Date: 7/10/2025

Reference Information

CVE: CVE-2025-38365