01 Record

CVE-2025-21703

netem: Update sch->q.qlen before qdisc_tree_reduce_backlog()

HighPUBLISHEDCNA: Linux

CNA base score7.8 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

View raw JSON

02 Description

netem: Update sch->q.qlen before qdisc_tree_reduce_backlog()

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.30% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 22.9% of scored records. A rank, not a probability.

NVD base score

7.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-10-15.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2025-02-18 14:37Z1 YR AGO

Last updated

2026-10-15 01:03Z14 DAYS AGO

Reserved

2024-12-29

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-416Use After FreeVariant

Data version

5.2

Document digest

b3e807226f876c8dad7c5e272c29863280d3921feb0ddce9500bd7204476b3d3

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux83c6ab12f08dcc09d4c5ac86fdb89736b28f1d31 to < e395fec75ac2dbffc99b4bce57b7f1f3c5449f2c, 216509dda290f6db92c816dd54b83c1df9da9e76 to < 7f31d74fcc556a9166b1bb20515542de7bb939d1, c2047b0e216c8edce227d7c42f99ac2877dad0e4 to < 98a2c685293aae122f688cde11d9334dddc5d207, 10df49cfca73dfbbdb6c4150d859f7e8926ae427 to < 7b79ca9a1de6a428d486ff52fb3d602321c08f55, 3824c5fad18eeb7abe0c4fc966f29959552dca3e to < 1f8e3f4a4b8b90ad274dfbc66fc7d55cb582f4d5, 356078a5c55ec8d2061fcc009fb8599f5b0527f9 to < 6312555249082d6d8cc5321ff725df05482d8b83, f8d4bc455047cf3903cd6f85f49978987dbb3027 to < 839ecc583fa00fab785fde1c85a326743657fd32, f8d4bc455047cf3903cd6f85f49978987dbb3027 to < 638ba5089324796c2ee49af10427459c2de35f71, 5.4.288 to < 5.4.291, 5.10.232 to < 5.10.235, 5.15.175 to < 5.15.179, 6.1.121 to < 6.1.129, 6.6.67 to < 6.6.78, 6.12.6 to < 6.12.14, 6.13—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/e395fec75ac2dbffc99b4bce57b7f1f3c5449f2c
git.kernel.orghttps://git.kernel.org/stable/c/7f31d74fcc556a9166b1bb20515542de7bb939d1
git.kernel.orghttps://git.kernel.org/stable/c/98a2c685293aae122f688cde11d9334dddc5d207
git.kernel.orghttps://git.kernel.org/stable/c/7b79ca9a1de6a428d486ff52fb3d602321c08f55
git.kernel.orghttps://git.kernel.org/stable/c/1f8e3f4a4b8b90ad274dfbc66fc7d55cb582f4d5
git.kernel.orghttps://git.kernel.org/stable/c/6312555249082d6d8cc5321ff725df05482d8b83
git.kernel.orghttps://git.kernel.org/stable/c/839ecc583fa00fab785fde1c85a326743657fd32
git.kernel.orghttps://git.kernel.org/stable/c/638ba5089324796c2ee49af10427459c2de35f71
lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-503939.html
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-784472.html

07 Fixed in

Debian 12

linux
Fixed in 6.1.129-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 6.12.15-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 6.12.15-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.