CVE-2025-38177
sch_hfsc: make hfsc_qlen_notify() idempotent
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved: sch_hfsc: make hfsc_qlen_notify() idempotent hfsc_qlen_notify() is not idempotent either and not friendly
to its callers, like fq_codel_dequeue(). Let's make it idempotent
to ease qdisc_tree_reduce_backlog() callers' life: 1. update_vf() decreases cl->cl_nactive, so we can check whether it is
non-zero before calling it. 2. eltree_remove() always removes RB node cl->el_node, but we can use RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.
In the Linux kernel, the following vulnerability has been resolved: sch_hfsc: make hfsc_qlen_notify() idempotent hfsc_qlen_notify() is not idempotent either and not friendly to its callers, like fq_codel_dequeue(). Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers' life: 1. update_vf() decreases cl->cl_nactive, so we can check whether it is non-zero before calling it. 2. eltree_remove() always removes RB node cl->el_node, but we can use RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.
This update provides the initial livepatch for this kernel update. This update does not contain any fixes and will be updated with livepatches later.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2025-04-16 CVE Reserved
- 2025-07-04 CVE Published
- 2026-01-02 CVE Updated
- 2026-03-30 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-459: Incomplete Cleanup
CAPEC
References (11)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/959466588aa7f84ccf79ae36a1d89542eaf9aaec | Vuln. Introduced |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2025-38177 | 2025-09-02 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2376354 | 2025-09-02 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.14 < 5.4.297 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.14 < 5.4.297" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.14 < 5.10.241 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.14 < 5.10.241" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.14 < 5.15.190 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.14 < 5.15.190" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.14 < 6.1.138 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.14 < 6.1.138" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.14 < 6.6.90 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.14 < 6.6.90" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.14 < 6.12.28 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.14 < 6.12.28" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.14 < 6.14.6 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.14 < 6.14.6" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.14 < 6.15 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.14 < 6.15" | en |
Affected
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