sch_htb: make htb_qlen_notify() idempotent
Priority LOW 24Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 5 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00238 14th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.4.294, 5.10.241, 5.15.190 +5Red Hat: 5 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 4.14 and later | 5.4.294, 5.10.241, 5.15.190, 6.1.138, 6.6.90, 6.12.28, 6.14.6, 6.15 | Patch available | CNA |
- Linux VendorLinux Affected 4.14 and later Fixed in 5.4.294, 5.10.241, 5.15.190, 6.1.138, 6.6.90, 6.12.28, 6.14.6, 6.15 Patch available CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | before 5.4.294; 5.5 to before 5.10.241; 5.11 to before 5.15.190; 5.16 to before 6.1.138; 6.2 to before 6.6.90; 6.7 to before 6.12.28; 6.13 to before 6.14.6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:* | 6.15 rc1 | Vulnerable | Linux |
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 11.0 | Vulnerable | Debian |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 5.4.294; 5.5 to before 5.10.241; 5.11 to before 5.15.190; 5.16 to before 6.1.138; 6.2 to before 6.6.90; 6.7 to before 6.12.28; 6.13 to before 6.14.6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:* Versions 6.15 rc1 Vulnerable ·Linux
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.4.294, 5.10.241, 5.15.190, 6.1.138, 6.6.90, 6.12.28, 6.14.6, 6.15
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2025-37932
- 2026-10-03 Alias added: GHSA-h35m-jp6f-245x
- 2026-11-05 CISA SSVC decision points changed
References
Patch 8
- https://git.kernel.org/stable/c/e6b45f4de763b00dc1c55e685e2dd1aaf525d3c1
- https://git.kernel.org/stable/c/32ae12ce6a9f6bace186ca7335220ff59b6cc3cd
- https://git.kernel.org/stable/c/967955c9e57f8eebfccc298037d4aaf3d42bc1c9
- https://git.kernel.org/stable/c/73cf6af13153d62f9b76eff422eea79dbc70f15e
- https://git.kernel.org/stable/c/bbbf5e0f87078b715e7a665d662a2c0e77f044ae
- https://git.kernel.org/stable/c/0a188c0e197383683fd093ab1ea6ce9a5869a6ea
- https://git.kernel.org/stable/c/a61f1b5921761fbaf166231418bc1db301e5bf59
- https://git.kernel.org/stable/c/5ba8b837b522d7051ef81bacf3d95383ff8edce5
More Linux Kernel vulnerabilities
- TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2025-37932 · CVE Program
- CVE-2025-37932 · NVD
- FIRST EPSS
- GHSA-h35m-jp6f-245x · GitHub Advisory Database · CC BY 4.0
- CVE-2025-37932 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences