Answer in brief
CVE-2026-72254 records a Unknown severity vulnerability in netfilter: nft_fib: reject fib expression on the netdev egress hook. 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 | >=42df6e1d221dddc0f2acf2be37e68d553ad65f96 <4fee43759b489559a491f7c95f9bfa7a1d0c7a10 || >=42df6e1d221dddc0f2acf2be37e68d553ad65f96 <568931f26af4727a51e8521f72efbc78d3b82410 || >=42df6e1d221dddc0f2acf2be37e68d553ad65f96 <d01c913febead04a01a5f3a6374d1f45504dc523 || >=42df6e1d221dddc0f2acf2be37e68d553ad65f96 <f68305267ebda7e839b5e8f77e8d77535a3d5a0f || >=42df6e1d221dddc0f2acf2be37e68d553ad65f96 <d07955dd34ecae17d35d8c7d0a273a3fba653a8c | 4fee43759b489559a491f7c95f9bfa7a1d0c7a10, 568931f26af4727a51e8521f72efbc78d3b82410, d01c913febead04a01a5f3a6374d1f45504dc523, f68305267ebda7e839b5e8f77e8d77535a3d5a0f, d07955dd34ecae17d35d8c7d0a273a3fba653a8c |
| Linux/Linuxgeneric | 5.16 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_fib: reject fib expression on the netdev egress hook A fib expression in a netdev egress base chain dereferences nft_in(pkt), NULL on the transmit path, causing a NULL pointer dereference at eval. nft_fib_validate() masks the hook with NF_INET_* values, but netdev hook numbers are a separate enum that aliases them (NF_NETDEV_EGRESS == NF_INET_LOCAL_IN), so an egress chain passes validation and then faults. Add nft_fib_netdev_validate() that limits each result/flag to the netdev hook where the device it reads exists: the input-device cases (OIF, OIFNAME, ADDRTYPE with F_IIF) to ingress, the output-device case (ADDRTYPE with F_OIF) to egress, ADDRTYPE with no device flag to both. Also restrict nft_fib_validate() to NFPROTO_IPV4/IPV6/INET so its NF_INET_* masks are not applied to another family's hooks.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-72254 records a Unknown severity vulnerability in netfilter: nft_fib: reject fib expression on the netdev egress hook. 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 | >=42df6e1d221dddc0f2acf2be37e68d553ad65f96 <4fee43759b489559a491f7c95f9bfa7a1d0c7a10 || >=42df6e1d221dddc0f2acf2be37e68d553ad65f96 <568931f26af4727a51e8521f72efbc78d3b82410 || >=42df6e1d221dddc0f2acf2be37e68d553ad65f96 <d01c913febead04a01a5f3a6374d1f45504dc523 || >=42df6e1d221dddc0f2acf2be37e68d553ad65f96 <f68305267ebda7e839b5e8f77e8d77535a3d5a0f || >=42df6e1d221dddc0f2acf2be37e68d553ad65f96 <d07955dd34ecae17d35d8c7d0a273a3fba653a8c | 4fee43759b489559a491f7c95f9bfa7a1d0c7a10, 568931f26af4727a51e8521f72efbc78d3b82410, d01c913febead04a01a5f3a6374d1f45504dc523, f68305267ebda7e839b5e8f77e8d77535a3d5a0f, d07955dd34ecae17d35d8c7d0a273a3fba653a8c |
| Linux/Linuxgeneric | 5.16 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_fib: reject fib expression on the netdev egress hook A fib expression in a netdev egress base chain dereferences nft_in(pkt), NULL on the transmit path, causing a NULL pointer dereference at eval. nft_fib_validate() masks the hook with NF_INET_* values, but netdev hook numbers are a separate enum that aliases them (NF_NETDEV_EGRESS == NF_INET_LOCAL_IN), so an egress chain passes validation and then faults. Add nft_fib_netdev_validate() that limits each result/flag to the netdev hook where the device it reads exists: the input-device cases (OIF, OIFNAME, ADDRTYPE with F_IIF) to ingress, the output-device case (ADDRTYPE with F_OIF) to egress, ADDRTYPE with no device flag to both. Also restrict nft_fib_validate() to NFPROTO_IPV4/IPV6/INET so its NF_INET_* masks are not applied to another family's hooks.
Quoted source text, attributed separately from HOL analysis.