Updated: 2025-12-28 03:48:25.22974
Description:
In the Linux kernel, the following vulnerability has been resolved: net_sched: red: fix a race in __red_change() Gerrard Tai reported a race condition in RED, 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.
| Links | NIST | CIRCL | RHEL | Ubuntu |
| Severity | Score | |
|---|---|---|
| CVSS Version 2.x | 0.0 | |
| CVSS Version 3.x | HIGH | 7.0 |
| OS name | Project name | Version | Score | Severity | Status | Errata | Last updated | Statement |
|---|---|---|---|---|---|---|---|---|
| AlmaLinux 9.2 ESU | kernel | 5.14.0 | 7.0 | HIGH | Needs Triage | 2025-12-28 08:02:12 | ||
| Oracle Linux 7 ELS | kernel-uek | 5.4.17 | 7.0 | HIGH | Released | CLSA-2025:1757963029 | 2025-09-16 11:20:02 | |
| TuxCare 9.6 ESU | kernel | 5.14.0 | 7.0 | HIGH | Needs Triage | 2025-12-28 08:02:11 | ||
| Ubuntu 20.04 ELS | linux | 5.4.0 | 7.0 | HIGH | Needs Triage | 2025-12-28 07:17:29 |