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Review reviewHigh

CVE-2023-53187

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free of new block group that became unused If a task creates a new block group and that block group becomes unused before we finish its creation, at btrfs_create_pending_block_groups(), then when btrfs_mark_bg_unused() is called against the block group, we assume that the block group is currently in the list of block groups to reclaim, and we move it out of the list of new block groups and into the list of unused block groups. This has two consequences: 1) We move it out of the list of new block groups...

CVSS
7.8
EPSS
0.15%
4.51% percentile
CISA KEV
Not listed
Published
2025.09.15
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.15%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free of new block group that became unused If a task creates a new block group and that block group becomes unused before we finish its creation, at btrfs_create_pending_block_groups(), then when btrfs_mark_bg_unused() is called against the block group, we assume that the block group is currently in the list of block groups to reclaim, and we move it out of the list of new block groups and into the list of unused block groups. This has two consequences: 1) We move it out of the list of new block groups...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 01eca70ef8cf499d0cb6d1bbd691558e7792cf17 < 6297644db23f77c02ae7961cc542d162629ae2c4, >= 5d19abcffd8404078dfa7d7118cec357b5e7bc58 < 7569c4294ba6ff9f194635b14876198f8a687c4a, >= a9f189716cf15913c453299d72f69c51a9b0f86b < 0657b20c5a76c938612f8409735a8830d257866e, >= edf3b5aadb2515c808200b904baa5b70a727f0ac, >= 5.15.128 < 5.16, 6.5
Fixed versions
5.16

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416
CVE-2023-53187 — Linux Linux, linux kernel | SECUFOCUS NOW