{"id":"CVE-2026-53353","title":"hsr: Remove WARN_ONCE() in hsr_addr_is_self().","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nhsr: Remove WARN_ONCE() in hsr_addr_is_self().\n\nsyzbot reported the warning [0] in hsr_addr_is_self(),\nwhose assumption is simply wrong.\n\nhsr->self_node is cleared in h…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < ff88df6d6a72458e1c4ca0e0342327cafd8317f4","Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < 4d256cddc47c0c34ffcf7e5205ee4c38863bf457","Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < 7610e3298aeb2439caa735131265fb634e0db4ec","Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < 271355c2ef6171dbc815e7ae653eed63444bbd58","Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < 0232b6fcb7615fb7fecfe0727a23065a53e228b8","Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < 66a46e22396fd5d09606f37f73643eb20e99aa42","Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < d71bb171661ec0225bf4babdd4d296d744982fb3","Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < afd0f17ca46258cec3a5cc48b8df9327fe772490","Linux 3.17"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:27:54.786603Z"},"published":"2026-07-01","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:34:22.759Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53353","references":[{"url":"https://git.kernel.org/stable/c/ff88df6d6a72458e1c4ca0e0342327cafd8317f4"},{"url":"https://git.kernel.org/stable/c/4d256cddc47c0c34ffcf7e5205ee4c38863bf457"},{"url":"https://git.kernel.org/stable/c/7610e3298aeb2439caa735131265fb634e0db4ec"},{"url":"https://git.kernel.org/stable/c/271355c2ef6171dbc815e7ae653eed63444bbd58"},{"url":"https://git.kernel.org/stable/c/0232b6fcb7615fb7fecfe0727a23065a53e228b8"},{"url":"https://git.kernel.org/stable/c/66a46e22396fd5d09606f37f73643eb20e99aa42"},{"url":"https://git.kernel.org/stable/c/d71bb171661ec0225bf4babdd4d296d744982fb3"},{"url":"https://git.kernel.org/stable/c/afd0f17ca46258cec3a5cc48b8df9327fe772490"}],"tags":["cve.org"],"epss":0.0012,"epssPercentile":0.0188,"ingestedAt":"2026-11-05T15:02:32.377Z","slug":"CVE-2026-53353","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nhsr: Remove WARN_ONCE() in hsr_addr_is_self().\n\nsyzbot reported the warning [0] in hsr_addr_is_self(),\nwhose assumption is simply wrong.\n\nhsr->self_node is cleared in hsr_del_self_node(), which\nis called from hsr_dellink().\n\nSince dev->rtnl_link_ops->dellink() is called before\nunregister_netdevice_many(), there is a window when\nuser can find the device but without hsr->self_node.\n\nLet's remove WARN_ONCE() in hsr_addr_is_self().\n\n[0]:\nHSR: No self node\nWARNING: net/hsr/hsr_framereg.c:39 at hsr_addr_is_self+0x211/0x3f0 net/hsr/hsr_framereg.c:39, CPU#0: syz.4.16848/17220\nModules linked in:\nCPU: 0 UID: 0 PID: 17220 Comm: syz.4.16848 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)}\nTainted: [L]=SOFTLOCKUP\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026\nRIP: 0010:hsr_addr_is_self+0x211/0x3f0 net/hsr/hsr_framereg.c:39\nCode: 33 2f 41 0f b7 dd 89 ee 09 de 31 ff e8 c8 b4 c6 f6 09 dd 74 54 e8 0f b0 c6 f6 31 ed eb 53 e8 06 b0 c6 f6 48 8d 3d 2f 50 9c 04 <67> 48 0f b9 3a 31 ed eb 42 e8 c1 13 1f 00 89 c5 31 ff 89 c6 e8 96\nRSP: 0018:ffffc900041c70e0 EFLAGS: 00010283\nRAX: ffffffff8afdc6ca RBX: ffffffff8afdc4e6 RCX: 0000000000080000\nRDX: ffffc90010493000 RSI: 0000000000000948 RDI: ffffffff8f9a1700\nRBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000\nR10: ffffc900041c71e8 R11: fffff52000838e3f R12: dffffc0000000000\nR13: ffff888041f9e3c0 R14: ffff888086ee3802 R15: 0000000000000000\nFS:  00007f6fe985d6c0(0000) GS:ffff888126176000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f80bd437dac CR3: 0000000025096000 CR4: 00000000003526f0\nDR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002\nDR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400\nCall Trace:\n <TASK>\n check_local_dest net/hsr/hsr_forward.c:592 [inline]\n fill_frame_info net/hsr/hsr_forward.c:728 [inline]\n hsr_forward_skb+0xa11/0x2a80 net/hsr/hsr_forward.c:739\n hsr_dev_xmit+0x253/0x370 net/hsr/hsr_device.c:236\n __netdev_start_xmit include/linux/netdevice.h:5368 [inline]\n netdev_start_xmit include/linux/netdevice.h:5377 [inline]\n xmit_one net/core/dev.c:3888 [inline]\n dev_hard_start_xmit+0x2df/0x860 net/core/dev.c:3904\n __dev_queue_xmit+0x1428/0x3900 net/core/dev.c:4870\n neigh_output include/net/neighbour.h:556 [inline]\n ip_finish_output2+0xcec/0x10b0 net/ipv4/ip_output.c:237\n ip_send_skb net/ipv4/ip_output.c:1510 [inline]\n ip_push_pending_frames+0x8b/0x110 net/ipv4/ip_output.c:1530\n raw_sendmsg+0x1547/0x1a50 net/ipv4/raw.c:659\n sock_sendmsg_nosec net/socket.c:787 [inline]\n __sock_sendmsg net/socket.c:802 [inline]\n ____sys_sendmsg+0x7da/0x9c0 net/socket.c:2698\n ___sys_sendmsg+0x2a5/0x360 net/socket.c:2752\n __sys_sendmsg net/socket.c:2784 [inline]\n __do_sys_sendmsg net/socket.c:2789 [inline]\n __se_sys_sendmsg net/socket.c:2787 [inline]\n __x64_sys_sendmsg+0x1c3/0x2a0 net/socket.c:2787\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f6feb62ce59\nCode: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f6fe985d028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\nRAX: ffffffffffffffda RBX: 00007f6feb8a6090 RCX: 00007f6feb62ce59\nRDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000004\nRBP: 00007f6feb6c2d6f R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\nR13: 00007f6feb8a6128 R14: 00007f6feb8a6090 R15: 00007ffcf01cc488\n </TASK>\n\n## Affected\n\n- `Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < ff88df6d6a72458e1c4ca0e0342327cafd8317f4`\n- `Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < 4d256cddc47c0c34ffcf7e5205ee4c38863bf457`\n- `Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < 7610e3298aeb2439caa735131265fb634e0db4ec`\n- `Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < 271355c2ef6171dbc815e7ae653eed63444bbd58`\n- `Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < 0232b6fcb7615fb7fecfe0727a23065a53e228b8`\n- `Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < 66a46e22396fd5d09606f37f73643eb20e99aa42`\n- `Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < d71bb171661ec0225bf4babdd4d296d744982fb3`\n- `Linux >= f266a683a4804dc499efc6c2206ef68efed029d0 < afd0f17ca46258cec3a5cc48b8df9327fe772490`\n- `Linux 3.17`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}