UBUNTU-CVE-2025-38083
In the Linux kernel, the following vulnerability has been resolved: net_sched: prio: fix a race in prio_tune() Gerrard Tai reported a race condition in PRIO, whenever SFQ perturb timer fires at the wrong time. The race is as follows: CPU 0 CPU 1 [1]: lock root [2]: qdisc_tree_flush_backlog() [3]: unlock root | | [5]: lock root | [6]: rehash | [7]: qdisc_tree_reduce_backlog() | [4]: qdisc_put() This can be abused to underflow a parent's qlen. Calling qdisc_purge_queue() instead of qdisc_tree_flush_backlog() should fix the race, because all packets will be purged from the qdisc before releasing the lock.
02 / AFFECTED SOFTWARE
Affected packages
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03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: net_sched: prio: fix a race in prio_tune() Gerrard Tai reported a race condition in PRIO, whenever SFQ perturb timer fires at the wrong time. The race is as follows: CPU 0 CPU 1 [1]: lock root [2]: qdisc_tree_flush_backlog() [3]: unlock root | | [5]: lock root | [6]: rehash | [7]: qdisc_tree_reduce_backlog() | [4]: qdisc_put() This can be abused to underflow a parent's qlen. Calling qdisc_purge_queue() instead of qdisc_tree_flush_backlog() should fix the race, because all packets will be purged from the qdisc before releasing the lock.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/d35acc1be3480505b5931f17e4ea9b7617fea4d3
- https://git.kernel.org/stable/c/46c15c9d0f65c9ba857d63f53264f4b17e8a715f
- https://git.kernel.org/stable/c/93f9eeb678d4c9c1abf720b3615fa8299a490845
- https://git.kernel.org/stable/c/d35acc1be3480505b5931f17e4ea9b7617fea4d3
- https://git.kernel.org/stable/c/e3f6745006dc9423d2b065b90f191cfa11b1b584
- https://ubuntu.com/security/CVE-2025-38083
- https://ubuntu.com/security/notices/USN-7681-1
- https://ubuntu.com/security/notices/USN-7681-2
- https://ubuntu.com/security/notices/USN-7681-3
- https://ubuntu.com/security/notices/USN-7682-1
- https://ubuntu.com/security/notices/USN-7682-2
- https://ubuntu.com/security/notices/USN-7682-3
- https://ubuntu.com/security/notices/USN-7682-4
- https://ubuntu.com/security/notices/USN-7682-5
- https://ubuntu.com/security/notices/USN-7682-6
- https://ubuntu.com/security/notices/USN-7683-1
- https://ubuntu.com/security/notices/USN-7683-2
- https://ubuntu.com/security/notices/USN-7683-3
- https://ubuntu.com/security/notices/USN-7686-1
- https://ubuntu.com/security/notices/USN-7701-1
- https://ubuntu.com/security/notices/USN-7701-2
- https://ubuntu.com/security/notices/USN-7701-3
- https://ubuntu.com/security/notices/USN-7711-1
- https://ubuntu.com/security/notices/USN-7712-1
- https://ubuntu.com/security/notices/USN-7712-2
- https://ubuntu.com/security/notices/USN-7719-1
- https://ubuntu.com/security/notices/USN-7721-1
- https://ubuntu.com/security/notices/USN-7737-1
- https://ubuntu.com/security/notices/USN-7819-1
- https://ubuntu.com/security/notices/USN-7819-2
- https://ubuntu.com/security/notices/USN-7832-1
- https://www.cve.org/CVERecord?id=CVE-2025-38083