CVE-2025-38108

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux0c8d13ac96070000da33f394f45e9c19638483c5 < 2790c4ec481be45a80948d059cd7c9a06bc37493affected
LinuxLinux0c8d13ac96070000da33f394f45e9c19638483c5 < a1bf6a4e9264a685b0e642994031f9c5aad72414affected
LinuxLinux0c8d13ac96070000da33f394f45e9c19638483c5 < 110a47efcf23438ff8d31dbd9c854fae2a48bf98affected
LinuxLinux0c8d13ac96070000da33f394f45e9c19638483c5 < f569984417a4e12c67366e69bdcb752970de921daffected
LinuxLinux0c8d13ac96070000da33f394f45e9c19638483c5 < 2a71924ca4af59ffc00f0444732b6cd54b153d0eaffected
LinuxLinux0c8d13ac96070000da33f394f45e9c19638483c5 < 4b755305b2b0618e857fdadb499365b5f2e478d1affected
LinuxLinux0c8d13ac96070000da33f394f45e9c19638483c5 < 444ad445df5496a785705019268a8a84b84484bbaffected
LinuxLinux0c8d13ac96070000da33f394f45e9c19638483c5 < 85a3e0ede38450ea3053b8c45d28cf55208409b8affected
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

References