CVE-2025-38637

In the current implementation, skbprio enqueue/dequeue contains an assertion that fails under certain conditions when SKBPRIO is used as a child qdisc under TBF with specific parameters. The failure occurs because TBF sometimes peeks at packets in the child qdisc without actually dequeuing them when tokens are unavailable.

This peek operation creates a discrepancy between the parent and child qdisc queue length counters. When TBF later receives a high-priority packet, SKBPRIO's queue length may show a different value than what's reflected in its internal priority queue tracking, triggering the assertion.

The fix removes this overly strict assertions in SKBPRIO, they are not necessary at all.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38637.json",
    "cna_assigner": "Linux"
}

References

Affected packages

Linux / Kernel

Package

Name: Kernel

Affected ranges

Type: ECOSYSTEM
Events: Introduced

4.19.0

Fixed

5.4.292

Type: ECOSYSTEM
Events: Introduced

5.5.0

Fixed

5.10.236

Type: ECOSYSTEM
Events: Introduced

5.11.0

Fixed

5.15.180

Type: ECOSYSTEM
Events: Introduced

5.16.0

Fixed

6.1.134

Type: ECOSYSTEM
Events: Introduced

6.2.0

Fixed

6.6.87

Type: ECOSYSTEM
Events: Introduced

6.7.0

Fixed

6.12.23

Type: ECOSYSTEM
Events: Introduced

6.13.0

Fixed

6.13.11

Type: ECOSYSTEM
Events: Introduced

6.14.0

Fixed

6.14.2

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-38637.json"