4.7

CVE-2025-38083

net_sched: prio: fix a race in prio_tune()

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 5.0 < 5.4.295
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.239
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.186
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.142
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.94
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.34
Linux ≫ Linux Kernel Version >= 6.13 < 6.15.3
Linux ≫ Linux Kernel Version6.16 Updaterc1
Debian ≫ Debian Linux Version11.0
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.11% 0.017
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 4.7 1 3.6
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

https://git.kernel.org/stable/c/46c15c9d0f65c9ba857d63f53264f4b17e8a715f
Patch
https://git.kernel.org/stable/c/e3f6745006dc9423d2b065b90f191cfa11b1b584
Patch
https://git.kernel.org/stable/c/93f9eeb678d4c9c1abf720b3615fa8299a490845
Patch
https://git.kernel.org/stable/c/d35acc1be3480505b5931f17e4ea9b7617fea4d3
Patch
https://git.kernel.org/stable/c/20f68e6a9e41693cb0e55e5b9ebbcb40983a4b8f
Patch
https://git.kernel.org/stable/c/3aaa7c01cf19d9b9bb64b88b65c3a6fd05da2eb4
Patch
https://git.kernel.org/stable/c/4483d8b9127591c60c4eb789d6cab953bc4522a9
Patch
https://git.kernel.org/stable/c/53d11560e957d53ee87a0653d258038ce12361b7
Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-082556.html