CVE-2026-72254High· 7.5▾ TwilightIn 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,…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.6%
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.
Linux >= 42df6e1d221dddc0f2acf2be37e68d553ad65f96 < 4fee43759b489559a491f7c95f9bfa7a1d0c7a10Linux >= 42df6e1d221dddc0f2acf2be37e68d553ad65f96 < 568931f26af4727a51e8521f72efbc78d3b82410Linux >= 42df6e1d221dddc0f2acf2be37e68d553ad65f96 < d01c913febead04a01a5f3a6374d1f45504dc523Linux >= 42df6e1d221dddc0f2acf2be37e68d553ad65f96 < f68305267ebda7e839b5e8f77e8d77535a3d5a0fLinux >= 42df6e1d221dddc0f2acf2be37e68d553ad65f96 < d07955dd34ecae17d35d8c7d0a273a3fba653a8cLinux 5.16Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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