7.8

CVE-2025-37914

net_sched: ets: Fix double list add in class with netem as child qdisc

In the Linux kernel, the following vulnerability has been resolved:

net_sched: ets: Fix double list add in class with netem as child qdisc

As described in Gerrard's report [1], there are use cases where a netem
child qdisc will make the parent qdisc's enqueue callback reentrant.
In the case of ets, there won't be a UAF, but the code will add the same
classifier to the list twice, which will cause memory corruption.

In addition to checking for qlen being zero, this patch checks whether
the class was already added to the active_list (cl_is_active) before
doing the addition to cater for the reentrant case.

[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 5.6 < 5.10.238
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.182
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.138
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.90
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.28
Linux ≫ Linux Kernel Version >= 6.13 < 6.14.6
Linux ≫ Linux Kernel Version6.15 Updaterc1
Linux ≫ Linux Kernel Version6.15 Updaterc2
Linux ≫ Linux Kernel Version6.15 Updaterc3
Linux ≫ Linux Kernel Version6.15 Updaterc4
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 0.17% 0.069
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-415 Double Free

The product calls free() twice on the same memory address.

https://git.kernel.org/stable/c/554acc5a2ea9703e08023eb9a003f9e5a830a502
Patch
https://git.kernel.org/stable/c/9efb6a0fa88e0910d079fdfeb4f7ce4d4ac6c990
Patch
https://git.kernel.org/stable/c/72c3da7e6ceb74e74ddbb5a305a35c9fdfcac6e3
Patch
https://git.kernel.org/stable/c/1f01e9f961605eb397c6ecd1d7b0233dfbf9077c
Patch
https://git.kernel.org/stable/c/bc321f714de693aae06e3786f88df2975376d996
Patch
https://git.kernel.org/stable/c/1a6d0c00fa07972384b0c308c72db091d49988b6
Patch
https://git.kernel.org/stable/c/24388ba0a1b1b6d4af1b205927ac7f7b119ee4ea
Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
Mailing List
https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html
Mailing List