Memory leak in Linux kernel btrfs

1) Memory leak

EUVDB-ID: #VU96830

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-44963

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to memory leak within the btrfs_quota_disable() function in fs/btrfs/qgroup.c, within the create_subvol() function in fs/btrfs/ioctl.c, within the btrfs_delete_free_space_tree() function in fs/btrfs/free-space-tree.c, within the btrfs_free_tree_block(), clear_bit() and walk_up_proc() functions in fs/btrfs/extent-tree.c, within the btrfs_force_cow_block(), balance_level(), insert_new_root() and btrfs_del_leaf() functions in fs/btrfs/ctree.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.6 - 6.10.4

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:6.6:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.6:rc1:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.6:rc2:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.6:rc3:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.6:rc4:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.6:rc5:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.6:rc6:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.6.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.6.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.6.3:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/98251cd60b4d702a8a81de442ab621e83a3fb24f
https://git.kernel.org/stable/c/bb3868033a4cccff7be57e9145f2117cbdc91c11
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.10.5
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.11
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.64

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.