CVE-2025-37932

sch_htb: make htb_qlen_notify() idempotent

MEDIUM

5.5

CVSS Score

Published: May 20, 2025 at 03:21 PM UTC

Updated: June 17, 2026 at 09:15 AM UTC

2 products affected across 2 vendorsLinux KernelDebian Linux

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.2%

Description

In the Linux kernel, the following vulnerability has been resolved: sch_htb: make htb_qlen_notify() idempotent htb_qlen_notify() always deactivates the HTB class and in fact could trigger a warning if it is already deactivated. Therefore, it is not idempotent and not friendly to its callers, like fq_codel_dequeue(). Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers' life.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux · Debiandrupal

95%

11.0

Linux Kernel · Linux

95%

v < 5.4.2944.14 ≤ v < 5.10.2414.14 ≤ v < 5.15.1904.14 ≤ v < 5.4.2944.14 ≤ v < 6.1.1384.14 ≤ v < 6.12.284.14 ≤ v < 6.14.64.14 ≤ v < 6.154.14 ≤ v < 6.6.905.11 ≤ v < 5.15.1905.16 ≤ v < 6.1.1385.5 ≤ v < 5.10.2416.13 ≤ v < 6.14.66.2 ≤ v < 6.6.906.7 ≤ v < 6.12.284.14 6.15 rc1959466588aa7f84ccf79ae36a1d89542eaf9aaec

Vendor states this is fixed in 0a188c0e197383683fd093ab1ea6ce9a5869a6ea (fixed)

Vendor states this is fixed in 32ae12ce6a9f6bace186ca7335220ff59b6cc3cd (fixed)

Vendor states this is fixed in 5ba8b837b522d7051ef81bacf3d95383ff8edce5 (fixed)

Vendor states this is fixed in 73cf6af13153d62f9b76eff422eea79dbc70f15e (fixed)

Vendor states this is fixed in 967955c9e57f8eebfccc298037d4aaf3d42bc1c9 (fixed)

Vendor states this is fixed in a61f1b5921761fbaf166231418bc1db301e5bf59 (fixed)

Vendor states this is fixed in bbbf5e0f87078b715e7a665d662a2c0e77f044ae (fixed)

Vendor states this is fixed in e6b45f4de763b00dc1c55e685e2dd1aaf525d3c1 (fixed)

Vendor states this is fixed in 4.14 (unaffected)

Vendor states this is fixed in 5.10.241 (unaffected)

Vendor states this is fixed in 5.15.190 (unaffected)

Vendor states this is fixed in 5.4.294 (unaffected)