7

CVE-2025-38108

net_sched: red: fix a race in __red_change()

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.
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
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.13% 0.028
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7 1 5.9
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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/2790c4ec481be45a80948d059cd7c9a06bc37493
Patch
https://git.kernel.org/stable/c/a1bf6a4e9264a685b0e642994031f9c5aad72414
Patch
https://git.kernel.org/stable/c/110a47efcf23438ff8d31dbd9c854fae2a48bf98
Patch
https://git.kernel.org/stable/c/f569984417a4e12c67366e69bdcb752970de921d
Patch
https://git.kernel.org/stable/c/2a71924ca4af59ffc00f0444732b6cd54b153d0e
Patch
https://git.kernel.org/stable/c/4b755305b2b0618e857fdadb499365b5f2e478d1
Patch
https://git.kernel.org/stable/c/444ad445df5496a785705019268a8a84b84484bb
Patch
https://git.kernel.org/stable/c/85a3e0ede38450ea3053b8c45d28cf55208409b8
Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
Third Party Advisory
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https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Third Party Advisory
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