CVE-2026-64569
Received Received - Intake

NULL dereference in Linux kernel MPLS route dump

Publication date: 2026-08-05

Last updated on: 2026-08-05

Assigner: kernel.org

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.

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Meta Information

Published
2026-08-05
Last Modified
2026-08-05
Generated
2026-08-05
AI Q&A
2026-08-05
EPSS Evaluated
N/A
NVD
CVE-2026-64569
EUVD
EUVD-2026-53263

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a NULL pointer dereference vulnerability in the Linux kernel's MPLS (Multiprotocol Label Switching) implementation. It occurs when CONFIG_INET is disabled during kernel compilation. The function mpls_valid_fib_dump_req() fails to check if the RTA_OIF attribute exists before accessing it, leading to a crash when processing certain RTM_GETROUTE requests.

Detection Guidance

This vulnerability triggers a NULL pointer dereference in the Linux kernel's MPLS routing code when CONFIG_INET is disabled. Detection requires checking kernel logs for a general protection fault in mpls_valid_fib_dump_req() or examining kernel configuration for CONFIG_INET=n. No specific commands are provided in the context.

Impact Analysis

An unprivileged user can trigger a kernel crash by sending a malicious RTM_GETROUTE request for AF_MPLS with strict checking and no RTA_OIF attribute. This causes a general protection fault and system instability. The impact is denial of service as the system may panic or reboot.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards. It is a Linux kernel flaw enabling local privilege escalation or denial of service via a NULL pointer dereference in MPLS route handling. Compliance impacts would only occur if exploitation led to unauthorized data access or service disruption in regulated environments.

Mitigation Strategies

Apply the kernel patch that resolves this issue. Ensure CONFIG_INET is enabled in your kernel configuration. Restrict access to CAP_NET_ADMIN capabilities if MPLS routing is not required. Monitor kernel logs for crashes related to MPLS operations.

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