CVE-2026-64569 is a vulnerability in Linux Kernel
Published on August 5, 2026
mpls: fix NULL deref in mpls_valid_fib_dump_req() on CONFIG_INET=n
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.
Products Associated with CVE-2026-64569
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Affected Versions
Linux:- Version 196cfebf897266c3450519e916bab9daff74e52c and below d6eee7cd078aaf9dd75efc801f6c9b608a37cd71 is affected.
- Version 196cfebf897266c3450519e916bab9daff74e52c and below ad6284ced6a15e4abd57ca4d0793b7bd15ca52ce is affected.
- Version 196cfebf897266c3450519e916bab9daff74e52c and below 5f6e7b32bd1fbde10fd31a4143260735ea535b8a is affected.
- Version 196cfebf897266c3450519e916bab9daff74e52c and below 06db79411a280707c7e4bf4b221ff4e664b51502 is affected.
- Version 196cfebf897266c3450519e916bab9daff74e52c and below 56d96fededd61192cd7cc8d2b0f36adfd59036c3 is affected.
- Version 4.20 is affected.
- Before 4.20 is unaffected.
- Version 6.6.148, <= 6.6.* is unaffected.
- Version 6.12.101, <= 6.12.* is unaffected.
- Version 6.18.42, <= 6.18.* is unaffected.
- Version 7.1.6, <= 7.1.* is unaffected.
- Version 7.2-rc4, <= * is unaffected.