CVE-2025-39759
- Source
- https://cve.org/CVERecord?id=CVE-2025-39759
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39759.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2025-39759
- Downstream
- Related
- Published
- 2025-09-11T16:52:28Z
- Modified
- 2026-08-12T03:30:19Z
- Summary
- btrfs: qgroup: fix race between quota disable and quota rescan ioctl
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
btrfs: qgroup: fix race between quota disable and quota rescan ioctl
There's a race between a task disabling quotas and another running the rescan ioctl that can result in a use-after-free of qgroup records from the fs_info->qgroup_tree rbtree.
This happens as follows:
-
Task A enters btrfs_ioctl_quota_rescan() -> btrfs_qgroup_rescan();
-
Task B enters btrfs_quota_disable() and calls btrfs_qgroup_wait_for_completion(), which does nothing because at that point fs_info->qgroup_rescan_running is false (it wasn't set yet by task A);
-
Task B calls btrfs_free_qgroup_config() which starts freeing qgroups from fs_info->qgroup_tree without taking the lock fs_info->qgroup_lock;
-
Task A enters qgroup_rescan_zero_tracking() which starts iterating the fs_info->qgroup_tree tree while holding fs_info->qgroup_lock, but task B is freeing qgroup records from that tree without holding the lock, resulting in a use-after-free.
Fix this by taking fs_info->qgroup_lock at btrfs_free_qgroup_config(). Also at btrfs_qgroup_rescan() don't start the rescan worker if quotas were already disabled.
-
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39759.json" }- References
-
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
- https://git.kernel.org/stable/c/2fd0f5ceb997f90f4332ccbab6c7e907e6b2d0eb
- https://git.kernel.org/stable/c/7cda0fdde5d9890976861421d207870500f9aace
- https://git.kernel.org/stable/c/b172535ccba12f0cf7d23b3b840989de47fc104d
- https://git.kernel.org/stable/c/c38028ce0d0045ca600b6a8345a0ff92bfb47b66
- https://git.kernel.org/stable/c/dd0b28d877b293b1d7f8727a7de08ae36b6b9ef0
- https://git.kernel.org/stable/c/e1249667750399a48cafcf5945761d39fa584edf
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39759.json
- https://nvd.nist.gov/vuln/detail/CVE-2025-39759
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducede685da14af6b31e4b336a110cb1bae1afc268be8Fixed7cda0fdde5d9890976861421d207870500f9aaceFixedb172535ccba12f0cf7d23b3b840989de47fc104dFixeddd0b28d877b293b1d7f8727a7de08ae36b6b9ef0Fixedc38028ce0d0045ca600b6a8345a0ff92bfb47b66Fixed2fd0f5ceb997f90f4332ccbab6c7e907e6b2d0ebFixede1249667750399a48cafcf5945761d39fa584edf
Linux / Kernel
Package
- Name
- Kernel