Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 42df6e1d221dddc0f2acf2be37e68d553ad65f96 before 4fee43759b489559a491f7c95f9bfa7a1d0c7a10; affected 42df6e1d221dddc0f2acf2be37e68d553ad65f96 before 568931f26af4727a51e8521f72efbc78d3b82410; affected 42df6e1d221dddc0f2acf2be37e68d553ad65f96 before d01c913febead04a01a5f3a6374d1f45504dc523; affected 42df6e1d221dddc0f2acf2be37e68d553ad65f96 before f68305267ebda7e839b5e8f77e8d77535a3d5a0f; affected 42df6e1d221dddc0f2acf2be37e68d553ad65f96 before d07955dd34ecae17d35d8c7d0a273a3fba653a8c |
| Linux / Linux | affected 5.16; unaffected 0 before 5.16; unaffected 6.6.148 through 6.6.*; unaffected 6.12.101 through 6.12.*; unaffected 6.18.42 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
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
ADP enrichment
No English description supplied.
No references supplied.