Description
In the Linux kernel, the following vulnerability has been resolved:
mpls: fix NULL deref in mpls_valid_fib_dump_req() on CONFIG_INET=n
On CONFIG_INET=n builds, mpls_valid_fib_dump_req() walks the parsed attribute table itself instead of calling ip_valid_fib_dump_req(). The RTA_OIF arm passes tb[RTA_OIF] to nla_get_u32() without checking it is present, so an RTM_GETROUTE dump for AF_MPLS with strict checking and no RTA_OIF hits a NULL dereference.
RTM_GETROUTE is RTNL_KIND_GET, which rtnetlink_rcv_msg() permits without CAP_NET_ADMIN, so an unprivileged user can trigger it.
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:mpls_valid_fib_dump_req (net/mpls/af_mpls.c:2189) Call Trace: mpls_dump_routes (net/mpls/af_mpls.c:2236) netlink_dump (net/netlink/af_netlink.c:2331) __netlink_dump_start (net/netlink/af_netlink.c:2446) rtnetlink_rcv_msg (net/core/rtnetlink.c:7033) netlink_rcv_skb (net/netlink/af_netlink.c:2556) netlink_unicast (net/netlink/af_netlink.c:1345) netlink_sendmsg (net/netlink/af_netlink.c:1900) __sock_sendmsg (net/socket.c:790) ____sys_sendmsg (net/socket.c:2684) ___sys_sendmsg (net/socket.c:2738) __sys_sendmsg (net/socket.c:2770) do_syscall_64 (arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
Skip unset attributes, as ip_valid_fib_dump_req() does.
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 196cfebf897266c3450519e916bab9daff74e52c, < bfc1cb5d6a8308e493e307f1c823d2107abc0a47; >= 196cfebf897266c3450519e916bab9daff74e52c, < 03b5a2c29afc8e634924c75d6ee94140e70de88d; >= 196cfebf897266c3450519e916bab9daff74e52c, < e796ce9ef4356dc7cbbaa8373843f77852f2814d; >= 196cfebf897266c3450519e916bab9daff74e52c, < d6eee7cd078aaf9dd75efc801f6c9b608a37cd71; >= 196cfebf897266c3450519e916bab9daff74e52c, < ad6284ced6a15e4abd57ca4d0793b7bd15ca52ce; >= 196cfebf897266c3450519e916bab9daff74e52c, < 5f6e7b32bd1fbde10fd31a4143260735ea535b8a; >= 196cfebf897266c3450519e916bab9daff74e52c, < 06db79411a280707c7e4bf4b221ff4e664b51502; >= 196cfebf897266c3450519e916bab9daff74e52c, < 56d96fededd61192cd7cc8d2b0f36adfd59036c3 |
| Linux | Linux | 4.20 |
References
- https://git.kernel.org/stable/c/03b5a2c29afc8e634924c75d6ee94140e70de88d
- https://git.kernel.org/stable/c/06db79411a280707c7e4bf4b221ff4e664b51502
- https://git.kernel.org/stable/c/56d96fededd61192cd7cc8d2b0f36adfd59036c3
- https://git.kernel.org/stable/c/5f6e7b32bd1fbde10fd31a4143260735ea535b8a
- https://git.kernel.org/stable/c/ad6284ced6a15e4abd57ca4d0793b7bd15ca52ce
- https://git.kernel.org/stable/c/bfc1cb5d6a8308e493e307f1c823d2107abc0a47
- https://git.kernel.org/stable/c/d6eee7cd078aaf9dd75efc801f6c9b608a37cd71
- https://git.kernel.org/stable/c/e796ce9ef4356dc7cbbaa8373843f77852f2814d
Timeline
- Published
- Aug 5, 2026
- Last modified
- Nov 6, 2026
- NVD status
- Undergoing Analysis