High 7.8Published May 20, 2025

CVE-2025-37915net_sched: drr: Fix double list add in class with netem as child qdisc

Updated under an hour ago (Oct 28, 2026, 4:00 AM ET)

Does this affect you?

It affects Linux and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: net_sched: drr: 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 drr, 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 adding to the list to cover for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea builds before 5da3aad1a13e7edb8ff0778a444ccf49930313e9; 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea builds before 4b07ac06b0a712923255aaf2691637693fc7100d; from 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea before 2968632880f1792007eedd12eeedf7f6e2b7e9f3; 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea builds before 4f0ecf50cdf76da95828578a92f130b653ac2fcf; from 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea before db205b92dfe0501e5b92fb7cf00971d0e44ba3eb; 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea builds before 26e75716b94d6ff9be5ea07d63675c4d189f30b4; from 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea before ab2248110738d4429668140ad22f530a9ee730e1; from 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea before f99a3fbf023e20b626be4b0f042463d598050c9a	CNA record
linux linux_kernel linux:linux_kernel	from 5.0.1 before 5.4.294; from 5.5 before 5.10.238; from 5.11 before 5.15.182; from 5.16 before 6.1.138; from 6.2 before 6.6.90; from 6.7 before 6.12.28; from 6.13 before 6.14.6; 5.0; and 10 more ranges	NVD

References

References

https://git.kernel.org/stable/c/5da3aad1a13e7edb8ff0778a444ccf49930313e9	patch
https://git.kernel.org/stable/c/4b07ac06b0a712923255aaf2691637693fc7100d	patch
https://git.kernel.org/stable/c/2968632880f1792007eedd12eeedf7f6e2b7e9f3	patch
https://git.kernel.org/stable/c/4f0ecf50cdf76da95828578a92f130b653ac2fcf	patch
https://git.kernel.org/stable/c/db205b92dfe0501e5b92fb7cf00971d0e44ba3eb	patch
https://git.kernel.org/stable/c/26e75716b94d6ff9be5ea07d63675c4d189f30b4	patch
https://git.kernel.org/stable/c/ab2248110738d4429668140ad22f530a9ee730e1	patch
https://git.kernel.org/stable/c/f99a3fbf023e20b626be4b0f042463d598050c9a	patch
https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html	mailing-list
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html	mailing-list

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.