CVE-2025-38108 (GCVE-0-2025-38108)

Vulnerability from cvelistv5 – Published: 2025-07-03 08:35 – Updated: 2025-11-03 17:34
VLAI?
Title
net_sched: red: fix a race in __red_change()
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0c8d13ac96070000da33f394f45e9c19638483c5 , < 2790c4ec481be45a80948d059cd7c9a06bc37493 (git)
Affected: 0c8d13ac96070000da33f394f45e9c19638483c5 , < a1bf6a4e9264a685b0e642994031f9c5aad72414 (git)
Affected: 0c8d13ac96070000da33f394f45e9c19638483c5 , < 110a47efcf23438ff8d31dbd9c854fae2a48bf98 (git)
Affected: 0c8d13ac96070000da33f394f45e9c19638483c5 , < f569984417a4e12c67366e69bdcb752970de921d (git)
Affected: 0c8d13ac96070000da33f394f45e9c19638483c5 , < 2a71924ca4af59ffc00f0444732b6cd54b153d0e (git)
Affected: 0c8d13ac96070000da33f394f45e9c19638483c5 , < 4b755305b2b0618e857fdadb499365b5f2e478d1 (git)
Affected: 0c8d13ac96070000da33f394f45e9c19638483c5 , < 444ad445df5496a785705019268a8a84b84484bb (git)
Affected: 0c8d13ac96070000da33f394f45e9c19638483c5 , < 85a3e0ede38450ea3053b8c45d28cf55208409b8 (git)
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    Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 5.4.295 , ≤ 5.4.* (semver)
Unaffected: 5.10.239 , ≤ 5.10.* (semver)
Unaffected: 5.15.186 , ≤ 5.15.* (semver)
Unaffected: 6.1.142 , ≤ 6.1.* (semver)
Unaffected: 6.6.94 , ≤ 6.6.* (semver)
Unaffected: 6.12.34 , ≤ 6.12.* (semver)
Unaffected: 6.15.3 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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