UBUNTU-CVE-2025-38477
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix race condition on qfq_aggregate A race condition can occur when 'agg' is modified in qfq_change_agg (called during qfq_enqueue) while other threads access it concurrently. For example, qfq_dump_class may trigger a NULL dereference, and qfq_delete_class may cause a use-after-free. This patch addresses the issue by: 1. Moved qfq_destroy_class into the critical section. 2. Added sch_tree_lock protection to qfq_dump_class and qfq_dump_class_stats.
02 / AFFECTED SOFTWARE
Affected packages
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24 explicit affected versions
63 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix race condition on qfq_aggregate A race condition can occur when 'agg' is modified in qfq_change_agg (called during qfq_enqueue) while other threads access it concurrently. For example, qfq_dump_class may trigger a NULL dereference, and qfq_delete_class may cause a use-after-free. This patch addresses the issue by: 1. Moved qfq_destroy_class into the critical section. 2. Added sch_tree_lock protection to qfq_dump_class and qfq_dump_class_stats.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/5e28d5a3f774f118896aec17a3a20a9c5c9dfc64
- https://git.kernel.org/stable/c/466e10194ab81caa2ee6a332d33ba16bcceeeba6
- https://git.kernel.org/stable/c/5e28d5a3f774f118896aec17a3a20a9c5c9dfc64
- https://git.kernel.org/stable/c/a6d735100f602c830c16d69fb6d780eebd8c9ae1
- https://git.kernel.org/stable/c/c000a3a330d97f6c073ace5aa5faf94b9adb4b79
- https://git.kernel.org/stable/c/fbe48f06e64134dfeafa89ad23387f66ebca3527
- https://ubuntu.com/security/CVE-2025-38477
- https://ubuntu.com/security/notices/USN-7791-1
- https://ubuntu.com/security/notices/USN-7791-2
- https://ubuntu.com/security/notices/USN-7791-3
- https://ubuntu.com/security/notices/USN-7791-4
- https://ubuntu.com/security/notices/USN-7792-1
- https://ubuntu.com/security/notices/USN-7792-2
- https://ubuntu.com/security/notices/USN-7792-3
- https://ubuntu.com/security/notices/USN-7793-1
- https://ubuntu.com/security/notices/USN-7793-2
- https://ubuntu.com/security/notices/USN-7793-3
- https://ubuntu.com/security/notices/USN-7793-4
- https://ubuntu.com/security/notices/USN-7793-5
- https://ubuntu.com/security/notices/USN-7795-1
- https://ubuntu.com/security/notices/USN-7795-2
- https://ubuntu.com/security/notices/USN-7795-3
- https://ubuntu.com/security/notices/USN-7795-4
- https://ubuntu.com/security/notices/USN-7795-5
- https://ubuntu.com/security/notices/USN-7796-1
- https://ubuntu.com/security/notices/USN-7796-2
- https://ubuntu.com/security/notices/USN-7796-3
- https://ubuntu.com/security/notices/USN-7796-4
- https://ubuntu.com/security/notices/USN-7798-1
- https://ubuntu.com/security/notices/USN-7799-1
- https://ubuntu.com/security/notices/USN-7800-1
- https://ubuntu.com/security/notices/USN-7801-1
- https://ubuntu.com/security/notices/USN-7801-2
- https://ubuntu.com/security/notices/USN-7801-3
- https://ubuntu.com/security/notices/USN-7808-1
- https://ubuntu.com/security/notices/USN-7808-2
- https://ubuntu.com/security/notices/USN-7809-1
- https://ubuntu.com/security/notices/USN-7810-1
- https://ubuntu.com/security/notices/USN-7810-2
- https://ubuntu.com/security/notices/USN-7810-3
- https://ubuntu.com/security/notices/USN-7811-1
- https://ubuntu.com/security/notices/USN-7819-1
- https://ubuntu.com/security/notices/USN-7819-2
- https://ubuntu.com/security/notices/USN-7820-1
- https://ubuntu.com/security/notices/USN-7821-1
- https://ubuntu.com/security/notices/USN-7854-1
- https://ubuntu.com/security/notices/USN-7933-1
- https://www.cve.org/CVERecord?id=CVE-2025-38477