CVE-2025-38083 (GCVE-0-2025-38083)

Vulnerability from cvelistv5 – Published: 2025-06-20 11:21 – Updated: 2025-11-03 17:33
VLAI?
Title
net_sched: prio: fix a race in prio_tune()
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 , < 53d11560e957d53ee87a0653d258038ce12361b7 (git)
Affected: 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 , < 4483d8b9127591c60c4eb789d6cab953bc4522a9 (git)
Affected: 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 , < 20f68e6a9e41693cb0e55e5b9ebbcb40983a4b8f (git)
Affected: 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 , < 3aaa7c01cf19d9b9bb64b88b65c3a6fd05da2eb4 (git)
Affected: 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 , < 46c15c9d0f65c9ba857d63f53264f4b17e8a715f (git)
Affected: 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 , < e3f6745006dc9423d2b065b90f191cfa11b1b584 (git)
Affected: 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 , < 93f9eeb678d4c9c1abf720b3615fa8299a490845 (git)
Affected: 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 , < d35acc1be3480505b5931f17e4ea9b7617fea4d3 (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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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: prio: fix a race in prio_tune()\n\nGerrard Tai reported a race condition in PRIO, whenever SFQ perturb timer\nfires at the wrong time.\n\nThe race is as follows:\n\nCPU 0                                 CPU 1\n[1]: lock root\n[2]: qdisc_tree_flush_backlog()\n[3]: unlock root\n |\n |                                    [5]: lock root\n |                                    [6]: rehash\n |                                    [7]: qdisc_tree_reduce_backlog()\n |\n[4]: qdisc_put()\n\nThis can be abused to underflow a parent\u0027s qlen.\n\nCalling qdisc_purge_queue() instead of qdisc_tree_flush_backlog()\nshould fix the race, because all packets will be purged from the qdisc\nbefore releasing the lock."
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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