CVE-2025-38083

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 < 53d11560e957d53ee87a0653d258038ce12361b7affected
LinuxLinux7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 < 4483d8b9127591c60c4eb789d6cab953bc4522a9affected
LinuxLinux7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 < 20f68e6a9e41693cb0e55e5b9ebbcb40983a4b8faffected
LinuxLinux7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 < 3aaa7c01cf19d9b9bb64b88b65c3a6fd05da2eb4affected
LinuxLinux7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 < 46c15c9d0f65c9ba857d63f53264f4b17e8a715faffected
LinuxLinux7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 < e3f6745006dc9423d2b065b90f191cfa11b1b584affected
LinuxLinux7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 < 93f9eeb678d4c9c1abf720b3615fa8299a490845affected
LinuxLinux7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 < d35acc1be3480505b5931f17e4ea9b7617fea4d3affected
LinuxLinux5.0affected
LinuxLinux0 < 5.0unaffected
LinuxLinux5.4.295 <= 5.4.*unaffected
LinuxLinux5.10.239 <= 5.10.*unaffected
LinuxLinux5.15.186 <= 5.15.*unaffected
LinuxLinux6.1.142 <= 6.1.*unaffected
LinuxLinux6.6.94 <= 6.6.*unaffected
LinuxLinux6.12.34 <= 6.12.*unaffected
LinuxLinux6.15.3 <= 6.15.*unaffected
LinuxLinux6.16 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

Additional References

References