CVE-2025-22121 - Vulnerability Details

- ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all()

Description

In the Linux kernel, the following vulnerability has been resolved:

ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all()

There's issue as follows:
BUG: KASAN: use-after-free in ext4_xattr_inode_dec_ref_all+0x6ff/0x790
Read of size 4 at addr ffff88807b003000 by task syz-executor.0/15172

CPU: 3 PID: 15172 Comm: syz-executor.0
Call Trace:
__dump_stack lib/dump_stack.c:82 [inline]
dump_stack+0xbe/0xfd lib/dump_stack.c:123
print_address_description.constprop.0+0x1e/0x280 mm/kasan/report.c:400
__kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560
kasan_report+0x3a/0x50 mm/kasan/report.c:585
ext4_xattr_inode_dec_ref_all+0x6ff/0x790 fs/ext4/xattr.c:1137
ext4_xattr_delete_inode+0x4c7/0xda0 fs/ext4/xattr.c:2896
ext4_evict_inode+0xb3b/0x1670 fs/ext4/inode.c:323
evict+0x39f/0x880 fs/inode.c:622
iput_final fs/inode.c:1746 [inline]
iput fs/inode.c:1772 [inline]
iput+0x525/0x6c0 fs/inode.c:1758
ext4_orphan_cleanup fs/ext4/super.c:3298 [inline]
ext4_fill_super+0x8c57/0xba40 fs/ext4/super.c:5300
mount_bdev+0x355/0x410 fs/super.c:1446
legacy_get_tree+0xfe/0x220 fs/fs_context.c:611
vfs_get_tree+0x8d/0x2f0 fs/super.c:1576
do_new_mount fs/namespace.c:2983 [inline]
path_mount+0x119a/0x1ad0 fs/namespace.c:3316
do_mount+0xfc/0x110 fs/namespace.c:3329
__do_sys_mount fs/namespace.c:3540 [inline]
__se_sys_mount+0x219/0x2e0 fs/namespace.c:3514
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x67/0xd1

Memory state around the buggy address:
ffff88807b002f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88807b002f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88807b003000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff88807b003080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff88807b003100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

Above issue happens as ext4_xattr_delete_inode() isn't check xattr
is valid if xattr is in inode.
To solve above issue call xattr_check_inode() check if xattr if valid
in inode. In fact, we can directly verify in ext4_iget_extra_inode(),
so that there is no divergent verification.

Published: 2025-04-16

Score: 7.1 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`e50e5129f384ae282adebfb561189cdb19b81cee`	affected	< 27202452b0bc942fdc3db72a44c4dcdab96d5b56
`e50e5129f384ae282adebfb561189cdb19b81cee`	affected	< b374e9ecc92aaa7fb2ab221ee3ff5451118ab566
`e50e5129f384ae282adebfb561189cdb19b81cee`	affected	< c000a8a9b5343a5ef867df173c6349672dacbd0f
`e50e5129f384ae282adebfb561189cdb19b81cee`	affected	< 3c591353956ffcace2cc74d09930774afed60619
`e50e5129f384ae282adebfb561189cdb19b81cee`	affected	< 098927a13fd918bd7c64c2de905350a1ad7b4a3a
`e50e5129f384ae282adebfb561189cdb19b81cee`	affected	< 0c8fbb6ffb3c8f5164572ca88e4ccb6cd6a41ca8
`e50e5129f384ae282adebfb561189cdb19b81cee`	affected	< 5701875f9609b000d91351eaa6bfd97fe2f157f4

Linux

affected

Version	Status	Constraints
`4.13`	affected	—
`0`	unaffected	< 4.13
`5.10.248`	unaffected	≤ 5.10.*
`5.15.198`	unaffected	≤ 5.15.*
`6.1.161`	unaffected	≤ 6.1.*
`6.6.120`	unaffected	≤ 6.6.*
`6.12.59`	unaffected	≤ 6.12.*
`6.14.2`	unaffected	≤ 6.14.*
`6.15`	unaffected	≤ *

Configuration 1 [-]

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

No data.

No data available yet.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

Source	ID	Title
Debian DLA	DLA-4475-1	linux security update
Debian DLA	DLA-4476-1	linux-6.1 security update
Debian DSA	DSA-6127-1	linux security update
EUVD	EUVD-2025-11160	In the Linux kernel, the following vulnerability has been resolved: ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all() There's issue as follows: BUG: KASAN: use-after-free in ext4_xattr_inode_dec_ref_all+0x6ff/0x790 Read of size 4 at addr ffff88807b003000 by task syz-executor.0/15172 CPU: 3 PID: 15172 Comm: syz-executor.0 Call Trace: __dump_stack lib/dump_stack.c:82 [inline] dump_stack+0xbe/0xfd lib/dump_stack.c:123 print_address_description.constprop.0+0x1e/0x280 mm/kasan/report.c:400 __kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560 kasan_report+0x3a/0x50 mm/kasan/report.c:585 ext4_xattr_inode_dec_ref_all+0x6ff/0x790 fs/ext4/xattr.c:1137 ext4_xattr_delete_inode+0x4c7/0xda0 fs/ext4/xattr.c:2896 ext4_evict_inode+0xb3b/0x1670 fs/ext4/inode.c:323 evict+0x39f/0x880 fs/inode.c:622 iput_final fs/inode.c:1746 [inline] iput fs/inode.c:1772 [inline] iput+0x525/0x6c0 fs/inode.c:1758 ext4_orphan_cleanup fs/ext4/super.c:3298 [inline] ext4_fill_super+0x8c57/0xba40 fs/ext4/super.c:5300 mount_bdev+0x355/0x410 fs/super.c:1446 legacy_get_tree+0xfe/0x220 fs/fs_context.c:611 vfs_get_tree+0x8d/0x2f0 fs/super.c:1576 do_new_mount fs/namespace.c:2983 [inline] path_mount+0x119a/0x1ad0 fs/namespace.c:3316 do_mount+0xfc/0x110 fs/namespace.c:3329 __do_sys_mount fs/namespace.c:3540 [inline] __se_sys_mount+0x219/0x2e0 fs/namespace.c:3514 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xd1 Memory state around the buggy address: ffff88807b002f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807b002f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807b003000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88807b003080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88807b003100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff Above issue happens as ext4_xattr_delete_inode() isn't check xattr is valid if xattr is in inode. To solve above issue call xattr_check_inode() check if xattr if valid in inode. In fact, we can directly verify in ext4_iget_extra_inode(), so that there is no divergent verification.
Ubuntu USN	USN-7594-1	Linux kernel vulnerabilities
Ubuntu USN	USN-7594-2	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-7594-3	Linux kernel vulnerabilities
Ubuntu USN	USN-8095-1	Linux kernel vulnerabilities
Ubuntu USN	USN-8096-1	Linux kernel vulnerabilities
Ubuntu USN	USN-8095-2	Linux kernel (FIPS) vulnerabilities
Ubuntu USN	USN-8096-2	Linux kernel (FIPS) vulnerabilities
Ubuntu USN	USN-8100-1	Linux kernel (NVIDIA) vulnerabilities
Ubuntu USN	USN-8095-3	Linux kernel (Real-time) vulnerabilities
Ubuntu USN	USN-8096-3	Linux kernel vulnerabilities
Ubuntu USN	USN-8096-4	Linux kernel (Real-time) vulnerabilities
Ubuntu USN	USN-8095-4	Linux kernel (AWS) vulnerabilities
Ubuntu USN	USN-8096-5	Linux kernel (NVIDIA Tegra IGX) vulnerabilities
Ubuntu USN	USN-8116-1	Linux kernel (Intel IoTG Real-time) vulnerabilities
Ubuntu USN	USN-8125-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-8126-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-8095-5	Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN	USN-8141-1	Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN	USN-8163-1	Linux kernel (Azure FIPS) vulnerabilities
Ubuntu USN	USN-8165-1	Linux kernel (Azure FIPS) vulnerabilities
Ubuntu USN	USN-8163-2	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-8243-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-8261-1	Linux kernel (Xilinx) vulnerabilities

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00086.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/098927a13fd918bd7c64c2de905350a1ad7b4a3a
https://git.kernel.org/stable/c/0c8fbb6ffb3c8f5164572ca88e4ccb6cd6a41ca8
https://git.kernel.org/stable/c/27202452b0bc942fdc3db72a44c4dcdab96d5b56
https://git.kernel.org/stable/c/3c591353956ffcace2cc74d09930774afed60619
https://git.kernel.org/stable/c/5701875f9609b000d91351eaa6bfd97fe2f157f4
https://git.kernel.org/stable/c/b374e9ecc92aaa7fb2ab221ee3ff5451118ab566
https://git.kernel.org/stable/c/c000a8a9b5343a5ef867df173c6349672dacbd0f
https://lore.kernel.org/linux-cve-announce/2025041628-CVE-2025-22121-52fd@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2025-22121
https://www.cve.org/CVERecord?id=CVE-2025-22121

History

Mon, 19 Jan 2026 12:45:00 +0000

Type	Values Removed	Values Added
References		https://git.kernel.org/stable/c/27202452b0bc942fdc3db72a44c4dcdab96d5b56 https://git.kernel.org/stable/c/b374e9ecc92aaa7fb2ab221ee3ff5451118ab566

Sat, 17 Jan 2026 16:00:00 +0000

Type	Values Removed	Values Added
References		https://git.kernel.org/stable/c/c000a8a9b5343a5ef867df173c6349672dacbd0f

Sun, 11 Jan 2026 16:45:00 +0000

Type	Values Removed	Values Added
References		https://git.kernel.org/stable/c/3c591353956ffcace2cc74d09930774afed60619

Mon, 24 Nov 2025 10:00:00 +0000

Type	Values Removed	Values Added
References		https://git.kernel.org/stable/c/098927a13fd918bd7c64c2de905350a1ad7b4a3a

Mon, 03 Nov 2025 18:30:00 +0000

Type	Values Removed	Values Added
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel

Tue, 27 May 2025 03:00:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-125
Metrics	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}`	cvssV3_1 `{'score': 7.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'}`

Fri, 18 Apr 2025 02:45:00 +0000

Type	Values Removed	Values Added
References		https://lore.kernel.org/linux-cve-announce/2025041628-CVE-2025-22121-52fd@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2025-22121 https://www.cve.org/CVERecord?id=CVE-2025-22121
Metrics	threat_severity `None`	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}` threat_severity `Moderate`

Wed, 16 Apr 2025 14:30:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all() There's issue as follows: BUG: KASAN: use-after-free in ext4_xattr_inode_dec_ref_all+0x6ff/0x790 Read of size 4 at addr ffff88807b003000 by task syz-executor.0/15172 CPU: 3 PID: 15172 Comm: syz-executor.0 Call Trace: __dump_stack lib/dump_stack.c:82 [inline] dump_stack+0xbe/0xfd lib/dump_stack.c:123 print_address_description.constprop.0+0x1e/0x280 mm/kasan/report.c:400 __kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560 kasan_report+0x3a/0x50 mm/kasan/report.c:585 ext4_xattr_inode_dec_ref_all+0x6ff/0x790 fs/ext4/xattr.c:1137 ext4_xattr_delete_inode+0x4c7/0xda0 fs/ext4/xattr.c:2896 ext4_evict_inode+0xb3b/0x1670 fs/ext4/inode.c:323 evict+0x39f/0x880 fs/inode.c:622 iput_final fs/inode.c:1746 [inline] iput fs/inode.c:1772 [inline] iput+0x525/0x6c0 fs/inode.c:1758 ext4_orphan_cleanup fs/ext4/super.c:3298 [inline] ext4_fill_super+0x8c57/0xba40 fs/ext4/super.c:5300 mount_bdev+0x355/0x410 fs/super.c:1446 legacy_get_tree+0xfe/0x220 fs/fs_context.c:611 vfs_get_tree+0x8d/0x2f0 fs/super.c:1576 do_new_mount fs/namespace.c:2983 [inline] path_mount+0x119a/0x1ad0 fs/namespace.c:3316 do_mount+0xfc/0x110 fs/namespace.c:3329 __do_sys_mount fs/namespace.c:3540 [inline] __se_sys_mount+0x219/0x2e0 fs/namespace.c:3514 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xd1 Memory state around the buggy address: ffff88807b002f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807b002f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807b003000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88807b003080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88807b003100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff Above issue happens as ext4_xattr_delete_inode() isn't check xattr is valid if xattr is in inode. To solve above issue call xattr_check_inode() check if xattr if valid in inode. In fact, we can directly verify in ext4_iget_extra_inode(), so that there is no divergent verification.
Title		ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all()
References		https://git.kernel.org/stable/c/0c8fbb6ffb3c8f5164572ca88e4ccb6cd6a41ca8 https://git.kernel.org/stable/c/5701875f9609b000d91351eaa6bfd97fe2f157f4

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-04-16T14:13:05.894Z

Updated: 2026-05-11T21:13:22.557Z

Reserved: 2024-12-29T08:45:45.823Z

Link: CVE-2025-22121

Vulnrichment

No data.

NVD

Status : Modified

Published: 2025-04-16T15:16:06.277

Modified: 2026-01-19T13:16:07.867

Link: CVE-2025-22121

Redhat

Severity : Moderate

Publid Date: 2025-04-16T00:00:00Z

Links: CVE-2025-22121 - Bugzilla

OpenCVE Enrichment

No data.

Weaknesses

CWE-125

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact High

User Interaction None

Subscriptions

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