CVE-2023-53450

ext4: remove a BUG_ON in ext4_mb_release_group_pa()

MEDIUM

5.5

CVSS Score

Published: October 1, 2025 at 11:42 AM UTC

Updated: June 17, 2026 at 06:45 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.2%

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: remove a BUG_ON in ext4_mb_release_group_pa() If a malicious fuzzer overwrites the ext4 superblock while it is mounted such that the s_first_data_block is set to a very large number, the calculation of the block group can underflow, and trigger a BUG_ON check. Change this to be an ext4_warning so that we don't crash the kernel.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

2.6.25 ≤ v < 4.14.3152.6.25 ≤ v < 4.19.2832.6.25 ≤ v < 5.10.1802.6.25 ≤ v < 5.15.1122.6.25 ≤ v < 5.4.2432.6.25 ≤ v < 6.1.292.6.25 ≤ v < 6.2.162.6.25 ≤ v < 6.3.32.6.25 ≤ v < 6.44.15 ≤ v < 4.19.2834.20 ≤ v < 5.4.2435.11 ≤ v < 5.15.1125.16 ≤ v < 6.1.295.5 ≤ v < 5.10.1806.2 ≤ v < 6.2.166.3 ≤ v < 6.3.32.6.25 6.4 rc1c9de560ded61faa5b754137b7753da252391c55a

Vendor states this is fixed in 185062a21976fbc38f2efd296951b02c4500cf65 (fixed)

Vendor states this is fixed in 463808f237cf73e98a1a45ff7460c2406a150a0b (fixed)

Vendor states this is fixed in 53c14e7cc2257191ba15425c15638fc4f8abb92b (fixed)

Vendor states this is fixed in 978e5e9111af18741449b81fefd531a622dd969a (fixed)

Vendor states this is fixed in b0fc279de4bf17e1710bb7e83906538ff8f11111 (fixed)

Vendor states this is fixed in bf2a16eb4e6d06124bd8436d4546f61539a65f29 (fixed)

Vendor states this is fixed in d5bf8f7fb3ee3d99d1303ceb54599ea0599a4a5b (fixed)

Vendor states this is fixed in d87a4e4094c9879fc8acdff8ce59fdffa979c8e0 (fixed)

Vendor states this is fixed in ef16d8a1798db1a1604ac44ca1bd73ec6bebf483 (fixed)

Vendor states this is fixed in 2.6.25 (unaffected)

Vendor states this is fixed in 4.14.315 (unaffected)

Vendor states this is fixed in 4.19.283 (unaffected)