Answer in brief
CVE-2025-40183 records a Unknown severity vulnerability in bpf: Fix metadata_dst leak __bpf_redirect_neigh_v{4,6}. 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-2025-40183 records a Unknown severity vulnerability in bpf: Fix metadata_dst leak __bpf_redirect_neigh_v{4,6}. 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 | >=b4ab31414970a7a03a5d55d75083f2c101a30592 <3fba965a9aac0fa3cbd8138436a37af9ab466d79 || >=b4ab31414970a7a03a5d55d75083f2c101a30592 <057764172fcc6ee2ccb6c41351a55a9f054dc8fd || >=b4ab31414970a7a03a5d55d75083f2c101a30592 <2e67c2037382abb56497bb9d7b7e10be04eb5598 || >=b4ab31414970a7a03a5d55d75083f2c101a30592 <b6bfe44b6dbb14a31d86c475cdc9c7689534fb09 || >=b4ab31414970a7a03a5d55d75083f2c101a30592 <f36a305d30f557306d87c787ddffe094ac5dac89 || >=b4ab31414970a7a03a5d55d75083f2c101a30592 <7404ce888a45eb7da0508b7cbbe6f2e95302eeb8 || >=b4ab31414970a7a03a5d55d75083f2c101a30592 <23f3770e1a53e6c7a553135011f547209e141e72 | 3fba965a9aac0fa3cbd8138436a37af9ab466d79, 057764172fcc6ee2ccb6c41351a55a9f054dc8fd, 2e67c2037382abb56497bb9d7b7e10be04eb5598, b6bfe44b6dbb14a31d86c475cdc9c7689534fb09, f36a305d30f557306d87c787ddffe094ac5dac89, 7404ce888a45eb7da0508b7cbbe6f2e95302eeb8, 23f3770e1a53e6c7a553135011f547209e141e72 |
| Linux/Linuxgeneric | 5.10 | 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: bpf: Fix metadata_dst leak __bpf_redirect_neigh_v{4,6} Cilium has a BPF egress gateway feature which forces outgoing K8s Pod traffic to pass through dedicated egress gateways which then SNAT the traffic in order to interact with stable IPs outside the cluster. The traffic is directed to the gateway via vxlan tunnel in collect md mode. A recent BPF change utilized the bpf_redirect_neigh() helper to forward packets after the arrival and decap on vxlan, which turned out over time that the kmalloc-256 slab usage in kernel was ever-increasing. The issue was that vxlan allocates the metadata_dst object and attaches it through a fake dst entry to the skb. The latter was never released though given bpf_redirect_neigh() was merely setting the new dst entry via skb_dst_set() without dropping an existing one first.
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 | >=b4ab31414970a7a03a5d55d75083f2c101a30592 <3fba965a9aac0fa3cbd8138436a37af9ab466d79 || >=b4ab31414970a7a03a5d55d75083f2c101a30592 <057764172fcc6ee2ccb6c41351a55a9f054dc8fd || >=b4ab31414970a7a03a5d55d75083f2c101a30592 <2e67c2037382abb56497bb9d7b7e10be04eb5598 || >=b4ab31414970a7a03a5d55d75083f2c101a30592 <b6bfe44b6dbb14a31d86c475cdc9c7689534fb09 || >=b4ab31414970a7a03a5d55d75083f2c101a30592 <f36a305d30f557306d87c787ddffe094ac5dac89 || >=b4ab31414970a7a03a5d55d75083f2c101a30592 <7404ce888a45eb7da0508b7cbbe6f2e95302eeb8 || >=b4ab31414970a7a03a5d55d75083f2c101a30592 <23f3770e1a53e6c7a553135011f547209e141e72 | 3fba965a9aac0fa3cbd8138436a37af9ab466d79, 057764172fcc6ee2ccb6c41351a55a9f054dc8fd, 2e67c2037382abb56497bb9d7b7e10be04eb5598, b6bfe44b6dbb14a31d86c475cdc9c7689534fb09, f36a305d30f557306d87c787ddffe094ac5dac89, 7404ce888a45eb7da0508b7cbbe6f2e95302eeb8, 23f3770e1a53e6c7a553135011f547209e141e72 |
| Linux/Linuxgeneric | 5.10 | 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: bpf: Fix metadata_dst leak __bpf_redirect_neigh_v{4,6} Cilium has a BPF egress gateway feature which forces outgoing K8s Pod traffic to pass through dedicated egress gateways which then SNAT the traffic in order to interact with stable IPs outside the cluster. The traffic is directed to the gateway via vxlan tunnel in collect md mode. A recent BPF change utilized the bpf_redirect_neigh() helper to forward packets after the arrival and decap on vxlan, which turned out over time that the kmalloc-256 slab usage in kernel was ever-increasing. The issue was that vxlan allocates the metadata_dst object and attaches it through a fake dst entry to the skb. The latter was never released though given bpf_redirect_neigh() was merely setting the new dst entry via skb_dst_set() without dropping an existing one first.
Quoted source text, attributed separately from HOL analysis.