CVE-2025-38083 In the Linux kernel, the following vulnerability has been resolved: net_sched: prio: fix a race in prio_tune() Gerrard…
Description
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux 6.16 | earliest → < 6.16 | 6.16 |
| Linux 6.15 | earliest → < 6.15.3 | 6.15.3 |
| Linux 6.12 | earliest → < 6.12.34 | 6.12.34 |
| Linux 6.6 | earliest → < 6.6.94 | 6.6.94 |
| Linux 6.1 | earliest → < 6.1.142 | 6.1.142 |
| Linux 5.15 | earliest → < 5.15.186 | 5.15.186 |
| Linux 5.10 | earliest → < 5.10.239 | 5.10.239 |
| Linux 5.4 | earliest → < 5.4.295 | 5.4.295 |
| Linux | 5.0 | No fix stated |
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| Product | Affected versions | Fixed in |
|---|---|---|
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP 3.1 | 3.1.5 → latest | No fix stated |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 3.1 | 3.1.5 → latest | No fix stated |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP 3.1 | 3.1.5 → latest | No fix stated |