# CVE-2025-68801: linux: In the Linux kernel, the following vulnerability has been resolved: mlxsw: spectrum_router: Fix neighbour use-after-... CVE-2025-68801 is fixed in 18 products on 1 platform, first by DEBIAN-CVE-2025-68801, released January 13, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2025-68801 - Priority: High - CVSS: 7.8 (high) - EPSS: 0.0015 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jan 13, 2026 ## Description In the Linux kernel, the following vulnerability has been resolved: mlxsw: spectrum_router: Fix neighbour use-after-free We sometimes observe use-after-free when dereferencing a neighbour [1]. The problem seems to be that the driver stores a pointer to the neighbour, but without holding a reference on it. A reference is only taken when the neighbour is used by a nexthop. Fix by simplifying the reference counting scheme. Always take a reference when storing a neighbour pointer in a neighbour entry. Avoid taking a referencing when the neighbour is used by a nexthop as the neighbour entry associated with the nexthop already holds a reference. Tested by running the test that uncovered the problem over 300 times. Without this patch the problem was reproduced after a handful of iterations. [1] BUG: KASAN: slab-use-after-free in mlxsw_sp_neigh_entry_update+0x2d4/0x310 Read of size 8 at addr ffff88817f8e3420 by task ip/3929 CPU: 3 UID: 0 PID: 3929 Comm: ip Not tainted 6.18.0-rc4-virtme-g36b21a067510 #3 PREEMPT(full) Hardware name: Nvidia SN5600/VMOD0013, BIOS 5.13 05/31/2023 Call Trace: dump_stack_lvl+0x6f/0xa0 print_address_description.constprop.0+0x6e/0x300 print_report+0xfc/0x1fb kasan_report+0xe4/0x110 mlxsw_sp_neigh_entry_update+0x2d4/0x310 mlxsw_sp_router_rif_gone_sync+0x35f/0x510 mlxsw_sp_rif_destroy+0x1ea/0x730 mlxsw_sp_inetaddr_port_vlan_event+0xa1/0x1b0 __mlxsw_sp_inetaddr_lag_event+0xcc/0x130 __mlxsw_sp_inetaddr_event+0xf5/0x3c0 mlxsw_sp_router_netdevice_event+0x1015/0x1580 notifier_call_chain+0xcc/0x150 call_netdevice_notifiers_info+0x7e/0x100 __netdev_upper_dev_unlink+0x10b/0x210 netdev_upper_dev_unlink+0x79/0xa0 vrf_del_slave+0x18/0x50 do_set_master+0x146/0x7d0 do_setlink.isra.0+0x9a0/0x2880 rtnl_newlink+0x637/0xb20 rtnetlink_rcv_msg+0x6fe/0xb90 netlink_rcv_skb+0x123/0x380 netlink_unicast+0x4a3/0x770 netlink_sendmsg+0x75b/0xc90 __sock_sendmsg+0xbe/0x160 ____sys_sendmsg+0x5b2/0x7d0 ___sys_sendmsg+0xfd/0x180 __sys_sendmsg+0x124/0x1c0 do_syscall_64+0xbb/0xfd0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 [...] Allocated by task 109: kasan_save_stack+0x30/0x50 kasan_save_track+0x14/0x30 __kasan_kmalloc+0x7b/0x90 __kmalloc_noprof+0x2c1/0x790 neigh_alloc+0x6af/0x8f0 ___neigh_create+0x63/0xe90 mlxsw_sp_nexthop_neigh_init+0x430/0x7e0 mlxsw_sp_nexthop_type_init+0x212/0x960 mlxsw_sp_nexthop6_group_info_init.constprop.0+0x81f/0x1280 mlxsw_sp_nexthop6_group_get+0x392/0x6a0 mlxsw_sp_fib6_entry_create+0x46a/0xfd0 mlxsw_sp_router_fib6_replace+0x1ed/0x5f0 mlxsw_sp_router_fib6_event_work+0x10a/0x2a0 process_one_work+0xd57/0x1390 worker_thread+0x4d6/0xd40 kthread+0x355/0x5b0 ret_from_fork+0x1d4/0x270 ret_from_fork_asm+0x11/0x20 Freed by task 154: kasan_save_stack+0x30/0x50 kasan_save_track+0x14/0x30 __kasan_save_free_info+0x3b/0x60 __kasan_slab_free+0x43/0x70 kmem_cache_free_bulk.part.0+0x1eb/0x5e0 kvfree_rcu_bulk+0x1f2/0x260 kfree_rcu_work+0x130/0x1b0 process_one_work+0xd57/0x1390 worker_thread+0x4d6/0xd40 kthread+0x355/0x5b0 ret_from_fork+0x1d4/0x270 ret_from_fork_asm+0x11/0x20 Last potentially related work creation: kasan_save_stack+0x30/0x50 kasan_record_aux_stack+0x8c/0xa0 kvfree_call_rcu+0x93/0x5b0 mlxsw_sp_router_neigh_event_work+0x67d/0x860 process_one_work+0xd57/0x1390 worker_thread+0x4d6/0xd40 kthread+0x355/0x5b0 ret_from_fork+0x1d4/0x270 ret_from_fork_asm+0x11/0x20 ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | dtb-aarch64 opensuse-leap 16.0 | 6.12.0-160000.26.1 | [OPENSUSE-SU-2026:20287-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20287-1.md) | Feb 27, 2026 | | Linux | kernel-64kb opensuse-leap 16.0 | 6.12.0-160000.26.1 | [OPENSUSE-SU-2026:20287-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20287-1.md) | Feb 27, 2026 | | Linux | kernel-64kb sles 15.7 | 6.4.0-150700.53.31.1 | [SUSE-SU-2026:0447-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0447-1.md) | Feb 11, 2026 | | Linux | kernel-64kb sles 16.0 | 6.12.0-160000.26.1 | [SUSE-SU-2026:20599-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20599-1.md) | Feb 27, 2026 | | Linux | kernel-azure opensuse-leap 16.0 | 6.12.0-160000.26.1 | [OPENSUSE-SU-2026:20287-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20287-1.md) | Feb 27, 2026 | | Linux | kernel-azure sles 15.7 | 6.4.0-150700.20.27.1 | [SUSE-SU-2026:0472-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0472-1.md) | Feb 12, 2026 | | Linux | kernel-azure sles 16.0 | 6.12.0-160000.26.1 | [SUSE-SU-2026:20599-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20599-1.md) | Feb 27, 2026 | | Linux | kernel-default opensuse-leap 16.0 | 6.12.0-160000.26.1 | [OPENSUSE-SU-2026:20287-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20287-1.md) | Feb 27, 2026 | | Linux | kernel-default sles 15.7 | 6.4.0-150700.53.31.1 | [SUSE-SU-2026:0447-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0447-1.md) | Feb 11, 2026 | | Linux | kernel-default sles 16.0 | 6.12.0-160000.26.1 | [SUSE-SU-2026:20599-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20599-1.md) | Feb 27, 2026 | | Linux | kernel-default-base opensuse-leap 16.0 | 6.12.0-160000.26.1.160000.2.7 | [OPENSUSE-SU-2026:20287-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20287-1.md) | Feb 27, 2026 | | Linux | kernel-default-base sles 15.7 | 6.4.0-150700.53.31.1.150700.17.21.1 | [SUSE-SU-2026:0447-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0447-1.md) | Feb 11, 2026 | | Linux | kernel-default-base sles 16.0 | 6.12.0-160000.26.1.160000.2.7 | [SUSE-SU-2026:20599-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20599-1.md) | Feb 27, 2026 | | Linux | kernel-docs opensuse-leap 16.0 | 6.12.0-160000.26.1 | [OPENSUSE-SU-2026:20287-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20287-1.md) | Feb 27, 2026 | | Linux | kernel-docs sles 15.7 | 6.4.0-150700.53.31.1 | [SUSE-SU-2026:0447-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0447-1.md) | Feb 11, 2026 | | Linux | kernel-docs sles 16.0 | 6.12.0-160000.26.1 | [SUSE-SU-2026:20599-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20599-1.md) | Feb 27, 2026 | | Linux | kernel-kvmsmall opensuse-leap 16.0 | 6.12.0-160000.26.1 | [OPENSUSE-SU-2026:20287-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20287-1.md) | Feb 27, 2026 | | Linux | kernel-kvmsmall sles 16.0 | 6.12.0-160000.26.1 | [SUSE-SU-2026:20599-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20599-1.md) | Feb 27, 2026 | | Linux | kernel-livepatch-SLE15-SP7-RT_Update_9 sles 15.7 | 1-150700.1.3.2 | [SUSE-SU-2026:0587-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0587-1.md) | Feb 20, 2026 | | Linux | kernel-livepatch-SLE15-SP7_Update_9 sles 15.7 | 1-150700.15.3.1 | [SUSE-SU-2026:0447-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0447-1.md) | Feb 11, 2026 | | Linux | kernel-obs-build opensuse-leap 16.0 | 6.12.0-160000.26.1 | [OPENSUSE-SU-2026:20287-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20287-1.md) | Feb 27, 2026 | | Linux | kernel-obs-build sles 15.7 | 6.4.0-150700.53.31.1 | [SUSE-SU-2026:0447-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0447-1.md) | Feb 11, 2026 | | Linux | kernel-obs-qa opensuse-leap 16.0 | 6.12.0-160000.26.1 | [OPENSUSE-SU-2026:20287-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20287-1.md) | Feb 27, 2026 | | Linux | kernel-obs-qa sles 16.0 | 6.12.0-160000.26.1 | [SUSE-SU-2026:20599-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20599-1.md) | Feb 27, 2026 | | Linux | kernel-rt opensuse-leap 16.0 | 6.12.0-160000.26.1 | [OPENSUSE-SU-2026:20287-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20287-1.md) | Feb 27, 2026 | | Linux | kernel-source opensuse-leap 16.0 | 6.12.0-160000.26.1 | [OPENSUSE-SU-2026:20287-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20287-1.md) | Feb 27, 2026 | | Linux | kernel-source sles 15.7 | 6.4.0-150700.53.31.1 | [SUSE-SU-2026:0447-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0447-1.md) | Feb 11, 2026 | | Linux | kernel-source sles 16.0 | 6.12.0-160000.26.1 | [SUSE-SU-2026:20599-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20599-1.md) | Feb 27, 2026 | | Linux | kernel-source-azure sles 15.7 | 6.4.0-150700.20.27.1 | [SUSE-SU-2026:0472-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0472-1.md) | Feb 12, 2026 | | Linux | kernel-syms opensuse-leap 16.0 | 6.12.0-160000.26.1 | [OPENSUSE-SU-2026:20287-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20287-1.md) | Feb 27, 2026 | | Linux | kernel-syms sles 15.7 | 6.4.0-150700.53.31.1 | [SUSE-SU-2026:0447-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0447-1.md) | Feb 11, 2026 | | Linux | kernel-syms sles 16.0 | 6.12.0-160000.26.1 | [SUSE-SU-2026:20599-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20599-1.md) | Feb 27, 2026 | | Linux | kernel-syms-azure sles 15.7 | 6.4.0-150700.20.27.1 | [SUSE-SU-2026:0472-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0472-1.md) | Feb 12, 2026 | | Linux | kernel-zfcpdump opensuse-leap 16.0 | 6.12.0-160000.26.1 | [OPENSUSE-SU-2026:20287-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20287-1.md) | Feb 27, 2026 | | Linux | kernel-zfcpdump sles 15.7 | 6.4.0-150700.53.31.1 | [SUSE-SU-2026:0447-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0447-1.md) | Feb 11, 2026 | | Linux | kernel-zfcpdump sles 16.0 | 6.12.0-160000.26.1 | [SUSE-SU-2026:20599-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20599-1.md) | Feb 27, 2026 | | Linux | linux Debian 12.15 (bookworm) | 6.1.162-1 | [DEBIAN-CVE-2025-68801](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68801.md) | Jan 13, 2026 | | Linux | linux Debian 13.5 (trixie) | 6.12.69-1 | [DEBIAN-CVE-2025-68801](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68801.md) | Jan 13, 2026 | | Linux | linux Debian 14 | 6.18.3-1 | [DEBIAN-CVE-2025-68801](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68801.md) | Jan 13, 2026 | --- Data as of 2026-11-08T13:06:02Z UTC. 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