{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-40905", "modified": "2026-10-07T17:22:01Z", "upstream": [ "CVE-2024-40905" ], "published": "2024-07-12T12:21:19Z", "summary": "ipv6: fix possible race in __fib6_drop_pcpu_from()", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix possible race in __fib6_drop_pcpu_from()\n\nsyzbot found a race in __fib6_drop_pcpu_from() [1]\n\nIf compiler reads more than once (*ppcpu_rt),\nsecond read could read NULL, if another cpu clears\nthe value in rt6_get_pcpu_route().\n\nAdd a READ_ONCE() to prevent this race.\n\nAlso add rcu_read_lock()/rcu_read_unlock() because\nwe rely on RCU protection while dereferencing pcpu_rt.\n\n[1]\n\nOops: general protection fault, probably for non-canonical address 0xdffffc0000000012: 0000 [#1] PREEMPT SMP KASAN PTI\nKASAN: null-ptr-deref in range [0x0000000000000090-0x0000000000000097]\nCPU: 0 PID: 7543 Comm: kworker/u8:17 Not tainted 6.10.0-rc1-syzkaller-00013-g2bfcfd584ff5 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024\nWorkqueue: netns cleanup_net\n RIP: 0010:__fib6_drop_pcpu_from.part.0+0x10a/0x370 net/ipv6/ip6_fib.c:984\nCode: f8 48 c1 e8 03 80 3c 28 00 0f 85 16 02 00 00 4d 8b 3f 4d 85 ff 74 31 e8 74 a7 fa f7 49 8d bf 90 00 00 00 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 1e 02 00 00 49 8b 87 90 00 00 00 48 8b 0c 24 48\nRSP: 0018:ffffc900040df070 EFLAGS: 00010206\nRAX: 0000000000000012 RBX: 0000000000000001 RCX: ffffffff89932e16\nRDX: ffff888049dd1e00 RSI: ffffffff89932d7c RDI: 0000000000000091\nRBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000007\nR10: 0000000000000001 R11: 0000000000000006 R12: ffff88807fa080b8\nR13: fffffbfff1a9a07d R14: ffffed100ff41022 R15: 0000000000000001\nFS: 0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000001b32c26000 CR3: 000000005d56e000 CR4: 00000000003526f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \n __fib6_drop_pcpu_from net/ipv6/ip6_fib.c:966 [inline]\n fib6_drop_pcpu_from net/ipv6/ip6_fib.c:1027 [inline]\n fib6_purge_rt+0x7f2/0x9f0 net/ipv6/ip6_fib.c:1038\n fib6_del_route net/ipv6/ip6_fib.c:1998 [inline]\n fib6_del+0xa70/0x17b0 net/ipv6/ip6_fib.c:2043\n fib6_clean_node+0x426/0x5b0 net/ipv6/ip6_fib.c:2205\n fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2127\n fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2175\n fib6_clean_tree+0xd7/0x120 net/ipv6/ip6_fib.c:2255\n __fib6_clean_all+0x100/0x2d0 net/ipv6/ip6_fib.c:2271\n rt6_sync_down_dev net/ipv6/route.c:4906 [inline]\n rt6_disable_ip+0x7ed/0xa00 net/ipv6/route.c:4911\n addrconf_ifdown.isra.0+0x117/0x1b40 net/ipv6/addrconf.c:3855\n addrconf_notify+0x223/0x19e0 net/ipv6/addrconf.c:3778\n notifier_call_chain+0xb9/0x410 kernel/notifier.c:93\n call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1992\n call_netdevice_notifiers_extack net/core/dev.c:2030 [inline]\n call_netdevice_notifiers net/core/dev.c:2044 [inline]\n dev_close_many+0x333/0x6a0 net/core/dev.c:1585\n unregister_netdevice_many_notify+0x46d/0x19f0 net/core/dev.c:11193\n unregister_netdevice_many net/core/dev.c:11276 [inline]\n default_device_exit_batch+0x85b/0xae0 net/core/dev.c:11759\n ops_exit_list+0x128/0x180 net/core/net_namespace.c:178\n cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:640\n process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231\n process_scheduled_works kernel/workqueue.c:3312 [inline]\n worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393\n kthread+0x2c1/0x3a0 kernel/kthread.c:389\n ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244", "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", 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"upstream_fixed": "6.6.35" }, "1:6.6.28-1+rpt1": { "linux_commit": "0c341f47adc3578cd5f817aa20ee2b7f9ae6b23e", "upstream_version": "6.6.28", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.35" }, "1:6.6.31-1+rpt1": { "linux_commit": "c1432b4bae5b6582f4d32ba381459f33c34d1424", "upstream_version": "6.6.31", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.35" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-40905" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/c90af1cced2f669a7b2304584be4ada495eaa0e5" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/c693698787660c97950bc1f93a8dd19d8307153d" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/a0bc020592b54a8f3fa2b7f244b6e39e526c2e12" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/2498960dac9b6fc49b6d1574f7cd1a4872744adf" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/7e796c3fefa8b17b30e7252886ae8cffacd2b9ef" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/09e5a5a80e205922151136069e440477d6816914" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/b01e1c030770ff3b4fe37fc7cc6bca03f594133f" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-05-12T04:54:46Z" } }