CVE-2025-38108
Linux Kernel net_sched red Race Condition Underflow Vulnerability
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.
INFO
Published Date :
July 3, 2025, 9:15 a.m.
Last Modified :
July 3, 2025, 3:13 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
References to Advisories, Solutions, and Tools
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CVE-2025-38108.
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The following table lists the changes that have been made to the
CVE-2025-38108 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 03, 2025
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/110a47efcf23438ff8d31dbd9c854fae2a48bf98 Added Reference https://git.kernel.org/stable/c/2790c4ec481be45a80948d059cd7c9a06bc37493 Added Reference https://git.kernel.org/stable/c/2a71924ca4af59ffc00f0444732b6cd54b153d0e Added Reference https://git.kernel.org/stable/c/444ad445df5496a785705019268a8a84b84484bb Added Reference https://git.kernel.org/stable/c/4b755305b2b0618e857fdadb499365b5f2e478d1 Added Reference https://git.kernel.org/stable/c/85a3e0ede38450ea3053b8c45d28cf55208409b8 Added Reference https://git.kernel.org/stable/c/a1bf6a4e9264a685b0e642994031f9c5aad72414 Added Reference https://git.kernel.org/stable/c/f569984417a4e12c67366e69bdcb752970de921d
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-38108 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-38108
weaknesses.