Integer underflow in Linux kernel btrfs



| Updated: 2025-05-10
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2025-37856
CWE-ID CWE-191
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Linux kernel
Operating systems & Components / Operating system

Vendor Linux Foundation

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Integer underflow

EUVDB-ID: #VU108885

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-37856

CWE-ID: CWE-191 - Integer underflow

Exploit availability: No

Description

The vulnerability allows a local user to execute arbitrary code.

The vulnerability exists due to integer underflow within the btrfs_put_transaction() and btrfs_cleanup_pending_block_groups() functions in fs/btrfs/transaction.c, within the btrfs_finish_extent_commit() function in fs/btrfs/extent-tree.c. A local user can execute arbitrary code.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.12 - 6.12.23

CPE2.3 External links

https://git.kernel.org/stable/c/185fd73e5ac06027c4be9a129e59193f6a3ef202
https://git.kernel.org/stable/c/7511e29cf1355b2c47d0effb39e463119913e2f6
https://git.kernel.org/stable/c/909e60fb469d4101c6b08cf6e622efb062bb24a1
https://git.kernel.org/stable/c/bf089c4d1141b27332c092b1dcca5022c415a3b6
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.24


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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