Answer in brief
CVE-2025-37913 records a Unknown severity vulnerability in net_sched: qfq: Fix double list add in class with netem as child qdisc. 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.
Answer in brief
CVE-2025-37913 records a Unknown severity vulnerability in net_sched: qfq: Fix double list add in class with netem as child qdisc. 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.
A CVSS score is not reported in the current record. 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.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea <041f410aec2c1751ee22b8b73ba05d38c3a6a602 || >=37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea <005a479540478a820c52de098e5e767e63e36f0a || >=37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea <0bf32d6fb1fcbf841bb9945570e0e2a70072c00f || >=37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea <0aa23e0856b7cedb3c88d8e3d281c212c7e4fbeb || >=37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea <a43783119e01849fbf2fe8855634e8989b240cb4 || >=37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea <53bc0b55178bd59bdd4bcd16349505cabf54b1a2 || >=37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea <370218e8ce711684acc4cdd3cc3c6dd7956bc165 || >=37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea <f139f37dcdf34b67f5bf92bc8e0f7f6b3ac63aa4 | 041f410aec2c1751ee22b8b73ba05d38c3a6a602, 005a479540478a820c52de098e5e767e63e36f0a, 0bf32d6fb1fcbf841bb9945570e0e2a70072c00f, 0aa23e0856b7cedb3c88d8e3d281c212c7e4fbeb, a43783119e01849fbf2fe8855634e8989b240cb4, 53bc0b55178bd59bdd4bcd16349505cabf54b1a2, 370218e8ce711684acc4cdd3cc3c6dd7956bc165, f139f37dcdf34b67f5bf92bc8e0f7f6b3ac63aa4 |
| Linux/Linuxgeneric | 5.0 | Not reported |
Published upstream
May 20, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 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: qfq: Fix double list add in class with netem as child qdisc As described in Gerrard's report [1], there are use cases where a netem child qdisc will make the parent qdisc's enqueue callback reentrant. In the case of qfq, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption. This patch checks whether the class was already added to the agg->active list (cl_is_active) before doing the addition to cater for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
Quoted source text, attributed separately from HOL analysis.
A CVSS score is not reported in the current record. 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.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea <041f410aec2c1751ee22b8b73ba05d38c3a6a602 || >=37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea <005a479540478a820c52de098e5e767e63e36f0a || >=37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea <0bf32d6fb1fcbf841bb9945570e0e2a70072c00f || >=37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea <0aa23e0856b7cedb3c88d8e3d281c212c7e4fbeb || >=37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea <a43783119e01849fbf2fe8855634e8989b240cb4 || >=37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea <53bc0b55178bd59bdd4bcd16349505cabf54b1a2 || >=37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea <370218e8ce711684acc4cdd3cc3c6dd7956bc165 || >=37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea <f139f37dcdf34b67f5bf92bc8e0f7f6b3ac63aa4 | 041f410aec2c1751ee22b8b73ba05d38c3a6a602, 005a479540478a820c52de098e5e767e63e36f0a, 0bf32d6fb1fcbf841bb9945570e0e2a70072c00f, 0aa23e0856b7cedb3c88d8e3d281c212c7e4fbeb, a43783119e01849fbf2fe8855634e8989b240cb4, 53bc0b55178bd59bdd4bcd16349505cabf54b1a2, 370218e8ce711684acc4cdd3cc3c6dd7956bc165, f139f37dcdf34b67f5bf92bc8e0f7f6b3ac63aa4 |
| Linux/Linuxgeneric | 5.0 | Not reported |
Published upstream
May 20, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 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: qfq: Fix double list add in class with netem as child qdisc As described in Gerrard's report [1], there are use cases where a netem child qdisc will make the parent qdisc's enqueue callback reentrant. In the case of qfq, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption. This patch checks whether the class was already added to the agg->active list (cl_is_active) before doing the addition to cater for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
Quoted source text, attributed separately from HOL analysis.