Answer in brief
CVE-2025-38193 records a High severity (CVSS 7.8) vulnerability in net_sched: sch_sfq: reject invalid perturb period. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e0936ff56be4e08ad5b60ec26971eae0c40af305 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2254d038dab9c194fe6a4b1ce31034f42e91a6e5 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <956b5aebb349449b38d920d444ca1392d43719d1 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b11a50544af691b787384089b68f740ae20a441b || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0357da9149eac621f39e235a135ebf155f01f7c3 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f9b97d466e6026ccbdda30bb5b71965b67ccbc82 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <590b2d7d0beadba2aa576708a05a05f0aae39295 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7ca52541c05c832d32b112274f81a985101f9ba8 | e0936ff56be4e08ad5b60ec26971eae0c40af305, 2254d038dab9c194fe6a4b1ce31034f42e91a6e5, 956b5aebb349449b38d920d444ca1392d43719d1, b11a50544af691b787384089b68f740ae20a441b, 0357da9149eac621f39e235a135ebf155f01f7c3, f9b97d466e6026ccbdda30bb5b71965b67ccbc82, 590b2d7d0beadba2aa576708a05a05f0aae39295, 7ca52541c05c832d32b112274f81a985101f9ba8 |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Jul 4, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: reject invalid perturb period Gerrard Tai reported that SFQ perturb_period has no range check yet, and this can be used to trigger a race condition fixed in a separate patch. We want to make sure ctl->perturb_period * HZ will not overflow and is positive. tc qd add dev lo root sfq perturb -10 # negative value : error Error: sch_sfq: invalid perturb period. tc qd add dev lo root sfq perturb 1000000000 # too big : error Error: sch_sfq: invalid perturb period. tc qd add dev lo root sfq perturb 2000000 # acceptable value tc -s -d qd sh dev lo qdisc sfq 8005: root refcnt 2 limit 127p quantum 64Kb depth 127 flows 128 divisor 1024 perturb 2000000sec Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0
Quoted source text, attributed separately from HOL analysis.