CVE-2026-72254netfilter: nft_fib: reject fib expression on the netdev egress hook
Updated under an hour ago ()
Does this affect you?
It affects Linux. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 42df6e1d221dddc0f2acf2be37e68d553ad65f96 builds before 4fee43759b489559a491f7c95f9bfa7a1d0c7a10; from 42df6e1d221dddc0f2acf2be37e68d553ad65f96 before 568931f26af4727a51e8521f72efbc78d3b82410; from 42df6e1d221dddc0f2acf2be37e68d553ad65f96 before d01c913febead04a01a5f3a6374d1f45504dc523; from 42df6e1d221dddc0f2acf2be37e68d553ad65f96 before f68305267ebda7e839b5e8f77e8d77535a3d5a0f; from 42df6e1d221dddc0f2acf2be37e68d553ad65f96 before d07955dd34ecae17d35d8c7d0a273a3fba653a8c | CNA record |
References
- https://git.kernel.org/stable/c/4fee43759b489559a491f7c95f9bfa7a1d0c7a10
- https://git.kernel.org/stable/c/568931f26af4727a51e8521f72efbc78d3b82410
- https://git.kernel.org/stable/c/d01c913febead04a01a5f3a6374d1f45504dc523
- https://git.kernel.org/stable/c/f68305267ebda7e839b5e8f77e8d77535a3d5a0f
- https://git.kernel.org/stable/c/d07955dd34ecae17d35d8c7d0a273a3fba653a8c
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.