Answer in brief
CVE-2025-39848 records a Unknown severity vulnerability in ax25: properly unshare skbs in ax25_kiss_rcv(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (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-2025-39848 records a Unknown severity vulnerability in ax25: properly unshare skbs in ax25_kiss_rcv(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (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), Siemens/SIMATIC CN 4100 (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <42b46684e2c78ee052d8c2ee8d9c2089233c9094 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5b079be1b9da49ad88fc304c874d4be7085f7883 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2bd0f67212908243ce88e35bf69fa77155b47b14 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <01a2984cb803f2d487b7074f9718db2bf3531f69 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7d449b7a6c8ee434d10a483feed7c5c50108cf56 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <89064cf534bea4bb28c83fe6bbb26657b19dd5fe || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b1c71d674a308d2fbc83efcf88bfc4217a86aa17 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8156210d36a43e76372312c87eb5ea3dbb405a85 | 42b46684e2c78ee052d8c2ee8d9c2089233c9094, 5b079be1b9da49ad88fc304c874d4be7085f7883, 2bd0f67212908243ce88e35bf69fa77155b47b14, 01a2984cb803f2d487b7074f9718db2bf3531f69, 7d449b7a6c8ee434d10a483feed7c5c50108cf56, 89064cf534bea4bb28c83fe6bbb26657b19dd5fe, b1c71d674a308d2fbc83efcf88bfc4217a86aa17, 8156210d36a43e76372312c87eb5ea3dbb405a85 |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
| Siemens/SIMATIC CN 4100generic | >=0 <V5.0 | V5.0 |
Published upstream
Sep 19, 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: ax25: properly unshare skbs in ax25_kiss_rcv() Bernard Pidoux reported a regression apparently caused by commit c353e8983e0d ("net: introduce per netns packet chains"). skb->dev becomes NULL and we crash in __netif_receive_skb_core(). Before above commit, different kind of bugs or corruptions could happen without a major crash. But the root cause is that ax25_kiss_rcv() can queue/mangle input skb without checking if this skb is shared or not. Many thanks to Bernard Pidoux for his help, diagnosis and tests. We had a similar issue years ago fixed with commit 7aaed57c5c28 ("phonet: properly unshare skbs in phonet_rcv()").
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), Siemens/SIMATIC CN 4100 (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <42b46684e2c78ee052d8c2ee8d9c2089233c9094 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5b079be1b9da49ad88fc304c874d4be7085f7883 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2bd0f67212908243ce88e35bf69fa77155b47b14 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <01a2984cb803f2d487b7074f9718db2bf3531f69 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7d449b7a6c8ee434d10a483feed7c5c50108cf56 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <89064cf534bea4bb28c83fe6bbb26657b19dd5fe || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b1c71d674a308d2fbc83efcf88bfc4217a86aa17 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8156210d36a43e76372312c87eb5ea3dbb405a85 | 42b46684e2c78ee052d8c2ee8d9c2089233c9094, 5b079be1b9da49ad88fc304c874d4be7085f7883, 2bd0f67212908243ce88e35bf69fa77155b47b14, 01a2984cb803f2d487b7074f9718db2bf3531f69, 7d449b7a6c8ee434d10a483feed7c5c50108cf56, 89064cf534bea4bb28c83fe6bbb26657b19dd5fe, b1c71d674a308d2fbc83efcf88bfc4217a86aa17, 8156210d36a43e76372312c87eb5ea3dbb405a85 |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
| Siemens/SIMATIC CN 4100generic | >=0 <V5.0 | V5.0 |
Published upstream
Sep 19, 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: ax25: properly unshare skbs in ax25_kiss_rcv() Bernard Pidoux reported a regression apparently caused by commit c353e8983e0d ("net: introduce per netns packet chains"). skb->dev becomes NULL and we crash in __netif_receive_skb_core(). Before above commit, different kind of bugs or corruptions could happen without a major crash. But the root cause is that ax25_kiss_rcv() can queue/mangle input skb without checking if this skb is shared or not. Many thanks to Bernard Pidoux for his help, diagnosis and tests. We had a similar issue years ago fixed with commit 7aaed57c5c28 ("phonet: properly unshare skbs in phonet_rcv()").
Quoted source text, attributed separately from HOL analysis.