Answer in brief
CVE-2025-40173 records a Unknown severity vulnerability in net/ip6_tunnel: Prevent perpetual tunnel growth. 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-2025-40173 records a Unknown severity vulnerability in net/ip6_tunnel: Prevent perpetual tunnel growth. 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 | >=8eb30be0352d09165e94a41fef1c7b994dca0714 <566f8d5c8a443f2dd69c5460fdec43ed1c870c65 || >=8eb30be0352d09165e94a41fef1c7b994dca0714 <11f6066af3bfb8149aa16c42c0b0c5ea5b199a94 || >=8eb30be0352d09165e94a41fef1c7b994dca0714 <402b6985e872b4cf394bbbf33b503947a326a6cb || >=8eb30be0352d09165e94a41fef1c7b994dca0714 <10fe967efe73c610e526ff7460581610633dee9c || >=8eb30be0352d09165e94a41fef1c7b994dca0714 <48294a67863c9cfa367abb66bbf0ef6548ae124f || >=8eb30be0352d09165e94a41fef1c7b994dca0714 <eeb4345488672584db4f8c20a1ae13a212ce31c4 || >=8eb30be0352d09165e94a41fef1c7b994dca0714 <b6eb25d870f1a8ae571fd3da2244b71df547824b || >=8eb30be0352d09165e94a41fef1c7b994dca0714 <21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16 | 566f8d5c8a443f2dd69c5460fdec43ed1c870c65, 11f6066af3bfb8149aa16c42c0b0c5ea5b199a94, 402b6985e872b4cf394bbbf33b503947a326a6cb, 10fe967efe73c610e526ff7460581610633dee9c, 48294a67863c9cfa367abb66bbf0ef6548ae124f, eeb4345488672584db4f8c20a1ae13a212ce31c4, b6eb25d870f1a8ae571fd3da2244b71df547824b, 21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16 |
| Linux/Linuxgeneric | 4.7 | Not reported |
Published upstream
Nov 12, 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/ip6_tunnel: Prevent perpetual tunnel growth Similarly to ipv4 tunnel, ipv6 version updates dev->needed_headroom, too. While ipv4 tunnel headroom adjustment growth was limited in commit 5ae1e9922bbd ("net: ip_tunnel: prevent perpetual headroom growth"), ipv6 tunnel yet increases the headroom without any ceiling. Reflect ipv4 tunnel headroom adjustment limit on ipv6 version. Credits to Francesco Ruggeri, who was originally debugging this issue and wrote local Arista-specific patch and a reproducer.
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 | >=8eb30be0352d09165e94a41fef1c7b994dca0714 <566f8d5c8a443f2dd69c5460fdec43ed1c870c65 || >=8eb30be0352d09165e94a41fef1c7b994dca0714 <11f6066af3bfb8149aa16c42c0b0c5ea5b199a94 || >=8eb30be0352d09165e94a41fef1c7b994dca0714 <402b6985e872b4cf394bbbf33b503947a326a6cb || >=8eb30be0352d09165e94a41fef1c7b994dca0714 <10fe967efe73c610e526ff7460581610633dee9c || >=8eb30be0352d09165e94a41fef1c7b994dca0714 <48294a67863c9cfa367abb66bbf0ef6548ae124f || >=8eb30be0352d09165e94a41fef1c7b994dca0714 <eeb4345488672584db4f8c20a1ae13a212ce31c4 || >=8eb30be0352d09165e94a41fef1c7b994dca0714 <b6eb25d870f1a8ae571fd3da2244b71df547824b || >=8eb30be0352d09165e94a41fef1c7b994dca0714 <21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16 | 566f8d5c8a443f2dd69c5460fdec43ed1c870c65, 11f6066af3bfb8149aa16c42c0b0c5ea5b199a94, 402b6985e872b4cf394bbbf33b503947a326a6cb, 10fe967efe73c610e526ff7460581610633dee9c, 48294a67863c9cfa367abb66bbf0ef6548ae124f, eeb4345488672584db4f8c20a1ae13a212ce31c4, b6eb25d870f1a8ae571fd3da2244b71df547824b, 21f4d45eba0b2dcae5dbc9e5e0ad08735c993f16 |
| Linux/Linuxgeneric | 4.7 | Not reported |
Published upstream
Nov 12, 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/ip6_tunnel: Prevent perpetual tunnel growth Similarly to ipv4 tunnel, ipv6 version updates dev->needed_headroom, too. While ipv4 tunnel headroom adjustment growth was limited in commit 5ae1e9922bbd ("net: ip_tunnel: prevent perpetual headroom growth"), ipv6 tunnel yet increases the headroom without any ceiling. Reflect ipv4 tunnel headroom adjustment limit on ipv6 version. Credits to Francesco Ruggeri, who was originally debugging this issue and wrote local Arista-specific patch and a reproducer.
Quoted source text, attributed separately from HOL analysis.