CVE-2025-37798

codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()

State: Published
Severity: 7.8 High
Published: May 2, 2025
Updated: Oct 15, 2026
Reserved: Apr 16, 2025

Description

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

codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()

After making all ->qlen_notify() callbacks idempotent, now it is safe to remove the check of qlen!=0 from both fq_codel_dequeue() and codel_qdisc_dequeue().

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before 7a742a9506849d1c1aa71e36c89855ceddc7d58eAffected 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before cc71a757da78dd4aa1b4a9b19cb011833730ccf2Affected 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450Affected 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before 829c49b6b2ff45b043739168fd1245e4e1a91a30Affected 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before 2f9761a94bae33d26e6a81b31b36e7d776d93dc1Affected 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before 4d55144b12e742404bb3f8fee6038bafbf45619dAffected 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before e73c838c80dccb9e4f19becc11d9f3cb4a27d483Affected 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31Affected 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before 342debc12183b51773b3345ba267e9263bdfaaefAffected
LinuxLinux	3.5Affected before 3.5Not affected 5.4.297 through 5.4.Not affected 5.10.241 through 5.10.Not affected 5.15.190 through 5.15.Not affected 6.1.135 through 6.1.Not affected 6.6.88 through 6.6.Not affected 6.12.24 through 6.12.Not affected 6.13.12 through 6.13.Not affected 6.14.3 through 6.14.Not affected 6.15 and laterNot affected

Product

Versions

LinuxLinux

76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before 7a742a9506849d1c1aa71e36c89855ceddc7d58eAffected
76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before cc71a757da78dd4aa1b4a9b19cb011833730ccf2Affected
76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450Affected
76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before 829c49b6b2ff45b043739168fd1245e4e1a91a30Affected
76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before 2f9761a94bae33d26e6a81b31b36e7d776d93dc1Affected
76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before 4d55144b12e742404bb3f8fee6038bafbf45619dAffected
76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before e73c838c80dccb9e4f19becc11d9f3cb4a27d483Affected
76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31Affected
76e3cc126bb223013a6b9a0e2a51238d1ef2e409 to before 342debc12183b51773b3345ba267e9263bdfaaefAffected

LinuxLinux

3.5Affected
before 3.5Not affected
5.4.297 through 5.4.*Not affected
5.10.241 through 5.10.*Not affected
5.15.190 through 5.15.*Not affected
6.1.135 through 6.1.*Not affected
6.6.88 through 6.6.*Not affected
6.12.24 through 6.12.*Not affected
6.13.12 through 6.13.*Not affected
6.14.3 through 6.14.*Not affected
6.15 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.